Walker MTLEFI, MTEFI, MTL User Manual

OWNER’S MANUAL

™

Safety, Assembly, Operating, and Maintenance Instructions

Model MT (23.0 HP)

Model MTL (25.0 HP)

Model MTEFI (26.0 HP)

Model MTLEFI (31.0 HP)

Please Read and Save These Instructions Effective Date: 08-09-09

For Safety, Read All Safety and Operation P/N 8000-16
Instructions Prior to Operating Machine

Foreword

Thank you. . .for purchasing a Walker mower. Eve ry ef for t has been made to provid e you with th e
most reliable mower on the market, and we are sure you will be among our many satisfied custom­ers. If for any reason this product does not perform to your expectations, please contact us at (970)
221-5614. Every customer is important to us. Your satisfaction is our goal.

Please. . .read this manual thoroughly! This manual is to be used in conjunction with the engine
manufacturer's manual for the specific engine on the mower model you have purchased. Before you
operate your new mower , please read this entire manual. Some of the information is crucial for prop­er operation and maintenance of this mower - it will help protect your investment and ensure that the
mower performs to your satisfaction. Some of the info rma ti on is important to your safety and must
be read and understood to help prevent possible injury to the operator or others. If anything in this
manual is confusing or hard to understand, please contact your local authorized dealer or call our
service department, at [phone], for clarification before operating or servicing this mower.

This manual covers Model MT with the Kohler Command Pro CH23 (23.0 HP) gasoline engine, or
optional Kohler Command Pro CH26 (26.0 HP) Electronic Fuel Injection (EFI) gasoline engine, or
optional Kohler Aegis LH685 (25.0 HP) gasoline engine (liquid cooled), or optional Kohler Aegis
LH775 (31.0 HP) Electronic Fuel Injection (EFI) gasoline engine (liquid cooled).

All shields and guards must be in place for the proper and safe operation of this machine.
Where they are shown removed in this manual, it is for illustration purposes only. Do not operate
this machine unless all shields and guards are in place.

Specifications given are based on the latest information available at the time this manual was pro­duced.

Walker Mfg. Co. is continually striving to improve the design and performance of its products. We
reserve the right to make changes in specifications a nd design without thereby incurrin g any obli­gation relative to previously manufactured products.

Sincerely,
WALKER MANUFACTURING COMPANY

Bob Walker, President

Table of Contents

General Information ________________ 1

HIGHLIGHTED INFORMATION _____________ 1
GLOSSARY ____________________________ 1
IDENTIFYING NUMBER LOCATIONS________ 1
ENGINE SERIAL NUMBER LOCATION ______ 2
SERVICING OF ENGINE AND
DRIVETRAIN COMPONENTS ______________ 2

Specifications________________________ 3

ENGINE________________________________ 3
ELECTRICAL SYSTEM ___________________ 4
TRANSMISSION_________________________ 4
BLADE DRIVE __________________________ 5
TIRE SIZE______________________________ 5
TIRE PRESSURE ________________________ 5
DIMENSIONS (Tractor and Mower) _________ 5
MOWER DECK__________________________ 6
CURB WEIGHT__________________________ 6
DRIVE BELTS___________________________ 6
GHS SYSTEM (Optional)__________________ 6
SEAT__________________________________ 7
FRAME/BODY CONSTRUCTION ___________ 7

Component Identification___________ 8 Safety Instructions _________________ 13

BEFORE OPERATING___________________ 13
OPERATING___________________________ 15
MAINTENANCE ________________________ 17
SAFETY, CONTROL,
AND INSTRUCTION DECALS _____________ 18

Assembly Instructions _____________ 20

SETUP INSTRUCTIONS _________________ 20

Tire Installation (Tractor)_______________ 20
Battery Service_______________________ 20

Wet Battery Service __________________ 20
Dry Battery Service __________________ 20
Battery Charging ____________________ 21
Battery Installation ___________________ 22

Mower Deck Assembly ________________ 22

Deck Caster Wheels Installation ________ 22
Deck Discharge Chute Installation ______ 22
Deck Discharge Shield Installation ______ 23
PTO Shaft Guard Installation __________ 23
Tilt-Up Roller Wheel Installation ________ 23

Mower Deck Installation on Tractor ______ 23

Deck Installation ____________________ 23
Deck Leveling ______________________ 25

PREOPERATING CHECKLIST ____________ 26

Operating Instructions_____________ 29

CONTROL IDENTIFICATION,
LOCATION, AND FUNCTION _____________ 29

Operating Controls ___________________ 29

Engine Choke - (Model MT and MTL only) 29
Engine Throttle _____________________ 30
Forward Speed Control (FSC) _________ 30
Steering Levers _____________________ 30
Blade Clutch (PTO) __________________ 30
Parking Brake ______________________ 30
Front Body Latch Release ____________ 32
Transmission Lockout Levers __________ 32
Optional Cold Start Lever _____________ 32
Suspension Seat (MTL and MTLEFI) ____ 33

Instrument Panel _____________________ 35

Hourmeter _________________________ 37
Voltmeter _________________________ 37
Oil Pressure Warning Light ____________ 37
Over Temperature Warning Light
(Model MT and MTEFI Only) __________ 37
Water Temperature Warning Light
(Model MTL and MTLEFI Only) ________ 38
Water Temperature Gauge
(Model MTL and MTLEFI Only) ________ 38
Engine Service Light
(Model MTEFI and MTLEFI Only) _______ 38
Ignition Switch ______________________ 38
Light Switch (For Optional Lights) _______ 38
Warning Horn ______________________ 38
Circuit Breakers ____________________ 39

STARTING THE ENGINE_________________ 39
ADJUSTING GROUND
SPEED AND STEERING _________________ 40
ENGAGING THE MOWER________________ 42
STOPPING THE MACHINE _______________ 43
ADJUSTING CUTTING HEIGHT ___________ 44
TRANSMISSION LOCKOUT ______________ 44
RECOMMENDATIONS FOR MOWING ______ 45
RECOMMENDATIONS FOR TILT-UP DECK
OPERATION/TRANSPORT_______________ 47
GRASS HANDLING SYSTEM (GHS) _______ 48

General Information __________________ 49
Clogging Checklist ___________________ 50
Using the Tilt-Up Deck ________________ 51
Using the GHS Catcher________________ 51

Powerfil
“Full” Signal Horn ___________________ 51

Cleaning the GHS Exhaust Screen ______ 51
Dumping the Catcher _________________ 52

Tailgate Dumping ___________________ 52
Using the Dump Bag _________________ 52
Power Dump Option _________________ 53
Hi-Dump

®

_________________________ 51

®

Option ___________________ 54

Table of Contents

Maintenance Instructions__________ 57

MAINTENANCE SCHEDULE CHART _______ 57
IMPORTANT TIPS FOR CARE
OF THE KOHLER ENGINE _______________ 58

Fuel System _________________________ 58
Starting/Stopping_____________________ 58
Cooling System - MT, MTEFI____________ 58
Cooling System - MTL _________________ 58
Air Cleaner System ___________________ 58
Oil _________________________________ 59

LUBRICATION _________________________ 59

Engine Oil ___________________________ 59

Engine Break-In Oil __________________ 59
Checking Engine Crankcase Oil Level ___ 59
Changing Engine Crankcase Oil/Oil Filter _60

Mower Deck Gearbox Lubrication _______ 60
DSD52 or DSD62
Mower Deck Lubrication _______________ 61
Tractor PTO Gearbox Lubrication _______ 62

Checking Gearbox Oil Level ___________ 62
Changing Gearbox Oil ________________ 62

Gear Axle Lubrication _________________ 62
Hydrostatic Transmission Fluid _________ 63

Checking Hydrostatic
Transmission Fluid Level ______________ 63

Grease Fitting and Oil Point Lubrication__ 63

CLEANING ____________________________ 66

Engine Air Cleaner System_____________ 66

Turbine Precleaner __________________ 66
Donaldson Radialseal™ Air Cleaner _____ 67

Engine Cooling System - MT and MTEFI __ 68

Air Intake System ___________________ 68
Cylinder Head Cooling Fins ____________ 69

Engine Cooling System - MTL and MTLEFI 69

Radiator Screen and Cooling Fins ______ 69
Flushing Radiator and Changing Coolant _70

Grass Buildup in Mower Housing________ 70
GHS Blower _________________________ 71
GHS Exhaust Screen __________________ 71
Hydrostatic Transmission Cooling Fins __ 71

CHECKING/SERVICING _________________ 72

Engine Cooling System - MTL and MTLEFI 72

Coolant Level ______________________ 72

Security of Air Filtration Components ____ 72
Battery______________________________ 73

Electrolyte Level ____________________ 73
Cleaning the Terminals _______________ 73
Charging the Battery _________________ 73

Tire Pressure ________________________ 74
Wheel Bolt Torque ____________________ 74
Sharpen Mower Blades ________________ 74
Drive Belts __________________________ 75

Mower Deck Gearbox Oil Seals

_____________________ 75

Spark Plugs _
Ignition Wires________________________ 75
Fuel Lines and Clamps ________________ 75
Radiator Hoses and Clamps ­MTL and MTLEFI _____________________ 76
Blade Brake Action ___________________ 76
PTO U-Joints ________________________ 76
Safety Switch System _________________ 76
Forward Speed Control Friction Lock____ 76

REPLACING/REPAIRING ________________ 77

Drive Belts __________________________ 77

Engine PTO Drive Belt _______________ 78
Jackshaft Drive Belt _________________ 79
GHS Blower Drive Belt _______________ 80
Hydrostatic Ground Drive Belt _________ 81

Fuel Filter - Model MT and MTL _________ 82
Fuel Filter - MTEFI and MTLEFI _________ 82
Blade Overload Shear Bolts ____________ 83
PTO Shear Pin _______________________ 83
Mower Blades _______________________ 84

ADJUSTMENTS________________________ 85

Steering Levers ______________________ 85
Tilt-Up Deck Adjustable Stop ___________ 85
GHS Signal Horn Adjustment
(When Horn Sounds at Wrong Time)_____ 86

___

_________ 75

Warranty___________________________ 87

General Information

HIGHLIGHTED INFORMATION

Walker Manufacturing recommends that any service
requiring special training or tools be performed by
an authorized Walker Mower Dealer . There are sev­eral general practices to be aware of in the area of
safety. Most accidents associated with the opera­tion or maintenance of a Walker Mower are caused
by disregarding basic safety precautions or specific
warnings. Such accidents, in most cases, can be
prevented by being aware of the dangers present.

Information of special importance has been high­lighted in bold type in this manual. Refer to Safety

Instructions for the meanings of DANGER, WARN­ING, CAUTION, IMPORTANT, and NOTE.

GLOSSARY

There are many terms that are either unique to this
equipment or that are used as acronyms. The
following terms and their definitions will help while
using this manual:

 DECK is the mowing attachment moun ted on

the front of the tractor which includes the carrier
frame, deck housing, blade drive gearboxes,
and cutter blades.

 LEFT HAND (LH) refers to the left-hand side of

the tractor when the operator is se ated facing
forward in the tractor seat.

 POWER TAKE-OFF (PTO) transmits engine

power to run the cutter blades and GHS blower .

 POWERFIL

throughout the interior of the grass catcher by
an oscillating delivery spout.



spreads the mowed material

 RIGHT HAND (RH) refers to the right-hand side

of the tractor when the operator is seated facing
forward in the tractor seat.

 SIDE DISCHARGE (SD) mows but does not

collect the mowed material.

 STEERING LEVERS steer the tractor by con-

trolling the dual hydrostatic transmissions.

 TRACTOR is the prime mover , including the en-

gine, drive train, operator seat, and controls to
operate the mower.

 TRANSMISSION LOCKOUT releases the hy-

drostatic transmissions to permit freewheeling
the tractor.

 ELECTRONIC CONTROL UNIT (ECU) controls

engine functions such as spark timing, fuel/air
ratio, etc.

 FORW ARD SPEED CONTROL (FSC) controls

the maximum forward speed of the tractor;
functioning as a cruise control.

 GRASS HANDLING SYSTEM (GHS

mowed material and deposits it in the catcher.

 GRASS-PAK

grass delivery spout (in the catcher) and acti­vates the “full” signal horn when the grass
catcher is full.



SWITCH is mounted on the



) collects

 GROUND DRIVE refers to the dual hydr os tatic

transmissions which drive the main wheels.

 HYDROSTATIC TRANSMISSION transmits

and controls power from the ground drive belt to
the main drive wheel.

IDENTIFYING NUMBER LOCATIONS

The tractor serial number plate is affixed to the trac­tor body just below the left rear corner of the seat.
The mower deck serial number plate is affixed
alongside the angle iron framing on the LH side of
the LH mower blade drive. Model and serial num­bers are helpful when obtaining replacement parts
and maintenance assistance. For ready reference,
please record these numbers in the space pr ovided.

Tractor Model No. _______________________
Tractor Serial No. _______________________
Deck Serial No. _______________________
Engine Model No. _______________________
Engine Serial No. _______________________
Date of Purchase _______________________

Fill In By Purchaser

1

General Information

Serial Number

Serial Number

Serial Number

Serial Number

Tractor Serial Number Location

Mower Deck Serial Number Location

ENGINE SERIAL NUMBER LOCATION

Refer to the engine manual th at accompanies this
manual for the location of the engine serial number.
For the mower model(s) covered by this manual, an
engine manual is available from Kohler covering the
Kohler engines.

Engine Serial Number Location

(MTL and MTLEFI)

SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS

The detailed servicing and repair of the engine,
hydrostatic transmission, and gearboxes are not
covered in this manual. Only routine maintenance
and general service instructions are provided. For
the service of these components during the limited
warranty period, it is important to find a local,
authorized servicing agent of the component manu­facturer. Any unauthorized work done on these
components during the warranty period may void
the warranty. If you have any difficulty find ing an
authorized outlet or obtaining warranty service,
please contact our Service Department for assis­tance:

Walker Manufacturing Company

5925 E. Harmony Road

Fort Collins, CO 80528

1-970-221-5614

Service manuals are available for each of these
components from their respective ma nufacturers as
follows:

2

Engine Serial Number Location

(MT and MTEFI)

Kohler Engines Kohler Company

Kohler, WI 53044
800-544-2444
www.kohlerengines.com

Hydrostatic Eaton Corporation
Transmissions 15151 Highway 5

Eden Prairie, MN 55344

Gearboxes (Deck) Tecumseh Power Co.

1555 S. Jackson Street
Salem, IN 47167
812-883-3575

Specifications

MODEL

AIR COOLED
MT (23.0 HP)
MTEFI (26.0 HP)

ENGINE

Manufacturer/Model Kohler Command Pro

CH23, 2 Cyl., Gasoline
(Air-Cooled)

Kohler Command Pro
CH26, 2 Cyl., Gasoline (Air­Cooled), Electronic Fuel
Injection (EFI)

Displacement CH23/CH680 41.1 cu. in. (674 cc)
Displacement CH26/CH735 44.0 cu. in. (721 cc)
Displacement LH685 41.1 cu. in. (674 cc)
Displacement LH775 45.6 cu. in. (748 cc)

HP (@ 3600 RPM) CH23/CH680 23.0
HP (@ 3600 RPM) CH26/CH735 26.0
HP (@ 3600 RPM) LH685 25.0
HP (@ 3600 RPM) LH775 31.0

Max. RPM (No Load)
Governed RPM 3600 3600

Max. Torque [ft-lb (N

Idle RPM 1200  75 1200  75
Spark Plug Type Champion
Spark Plug Ga p .030 in. (.76 mm) .030 in. (.76 mm)
Crankcase Capacity 1.7 qts (1.6 liters) 1.7 qts (1.6 liters)
Crankcase Lubricant API SG, SH, SJ or higher

Oil Filter 12 050 01 S 12 050 01 S
Cooling System CH23/CH680

Cooling System CH26/CH735 Air-Cooled
Cooling System LH685

Cooling System Capacity
(Approx.) LH685/LH775

Coolant 50/50 Pre-Mix Anti-freeze/

Cooling Fan Electric radiator cooling fan

Fuel Tank Capacity 5 Gallons (19.0 liters) 5 Gallons (19.0 liters)
Fuel Regular Grade Unleaded

·m) @ RPM]

CH23/CH680 37.9 (51.4) @ 2400
CH26/CH735 41.6 (56.4) @ 2700

LH685 35.9 (48.7) @ 2200
LH775 45.4 (61.6) @ 2400

LH775

3750



RC12YC Champion RC14YC

Grade Oil Only with 10W-30
Viscosity above 0° F (-18° C),
or 5W-20 or 5W-30 Viscosity
below 32° F (0° C)

Air-Cooled

Gasoline (87 Octane)





LIQUID COOLED
MTL (25.0 HP)
MTLEFI (31.0 HP)

TM

Kohler Aegis
Gasoline (Liquid-Cooled)

Kohler AegisTM LH775, 2 Cyl.,
Gasoline (Liquid-Cooled),
Electronic Fuel Injection (EFI)

3750

API SG, SH, SJ or higher
Grade Oil Only with 10W-30
Viscosity above 0° F (-18° C),
or 5W-20 or 5W-30 Viscosity
below 32° F (0° C)

Liquid-Cooled
Liquid-Cooled

1.25 Gallons (4.73 liters)

water

with reversible self-cleaning
action

Regular Grade Unleaded
Gasoline (87 Octane)

LH685, 2 Cyl.,

3

Specifications

MODEL

AIR COOLED
MT (23.0 HP)
MTEFI (26.0 HP)

ELECTRICAL SYSTEM

Battery 12 Volt, 35AH, 295 CCA 12 Volt, 41AH, 340 CCA

Charging System Flywheel Alternator Flywheel Alternator
Charging Output

CH23/CH680

CH26/CH735
System Polarity Negative Ground Negative Ground
Ignition Electronic Capacitive

Starter 12 Volt Electric Ring-Gear

Interlock Switch Ignition Lockout by Seat

Circuit Breaker

LH685
LH775

TRANSMISSION

Manufacturer/Model Dual Hydrostatic, Eaton

Steering Hand Lever Control /

Forward Speed Control Precision Friction Lock Lever,

15 Amp DC (Regulated)
25 Amp DC (Regulated)

Discharge

Type, Solenoid Shift

Switch, Transmission Neutral
and Blade Clutch

Auto Reset (30A)

Model 7, Each Wheel
Independently Driven

Individual Wheel

Cruise Control, with
Neutral-Park Position

LIQUID COOLED
MTL (25.0 HP)
MTLEFI (31.0 HP)

(Interstate U1-SP40)

25 Amp DC (Regulated)

Electronic Capacitive
Discharge

12 Volt Electric Ring-Gear
Type, Solenoid Shift

Ignition Lockout by Seat
Switch, Transmission Neutral
and Blade Clutch

Auto Reset (30A)
Auto Reset (40A)

Dual Hydrostatic, Eaton
Model 7, Each Wheel
Independently Driven

Hand Lever Control /
Individual Wheel

Precision Friction Lock Lever,
Cruise Control, with
Neutral-Park Position

Service Brake Dynamic Braking through

Hydrostatic Transmission

Parking Brake Mechanical Pin Lock in

Transmission Gear

Neutral Transmission Release by

Manual Dump Valve

Final Drive Gear Drive Axle Gear Drive Axle

Transmission Fluid

Factory Service Mobil 1 Synthetic Motor Oil

(15W-50)

Alternate Transmission Fluid SAE 30W Straight Viscosity

Motor Oil
Transmission Fluid Capacity 1 qt (1 liter) 1 qt (1 liter)
Transmission Cooling Cooling Fan Mounted on

Drive Pulley

4

Dynamic Braking through
Hydrostatic Transmission

Mechanical Pin Lock in
Transmission Gear

Transmission Release by
Manual Dump Valve

Mobil 1 Synthetic Motor Oil
(15W-50)

SAE 30W Straight Viscosity
Motor Oil

Cooling Fan Mounted on
Drive Pulley

Specifications

MODEL

AIR COOLED

MT (23.0 HP)

MTEFI (26.0 HP)

TRANSMISSION (continued)
Ground Travel Speed

Forward m.p.h. (km/h)
Reverse m.p.h. (km/h)

BLADE DRIVE

PTO Shaft Quick Disconnect Splined

Blade Spindle Each Blade (2) Mounts Direct

Blade Drive Clutch and Brake Manual Belt Tightener Clutch

Max. Blade Speed
[22 in. (56 cm) Blade]
@ 3600 RPM Engine

0-5 (0-8) Infinitely Variable*

0-5 (0-8) Infinitely Variable

* 6.5 m.p.h. with Optional Speed-Up Kit

Shaft with Tw o High-Speed
U-Joints

on Peerless Right Angle
Gearbox with Tee Gearbox
in Center Connected to PTO
Shaft (Complete Geared
Drive, Peerless Model 1000
Gearboxes)

and Band Brake [Stops
Blades within Five (5)
Seconds of Disengagement]

2900 RPM
[16700 FPM (5090 m/min)]

LIQUID COOLED
MTL (25.0 HP)
MTLEFI (31.0 HP)

0-7 (0-11) Infinitely Variable
0-7 (0-11) Infinitely Variable

Quick Disconnect Splined
Shaft with Two High-Speed
U-Joints

Each Blade (2) Mounts Direct
on Peerless Right Angle
Gearbox with Tee Gearbox
in Center Connected to PTO
Shaft (Complete Geared
Drive, Peerless Model 1000
Gearboxes)

Manual Belt Tightener Clutch
and Band Brake [Stops
Blades within Five (5)
Seconds of Disengagement]

2900 RPM
[16700 FPM (5090 m/min)]

TIRE SIZE

Deck Caster Wheel

36, 42, 48, 56
52, 62, 74

Deck Caster Wheel (Optional)

36, 42, 48, 56 8 x 3.00-4 Foamed Rubber 8 x 3.00-4 Foamed Rubber
Drive 18 x 9.50-8 (4-Ply) 18 x 9.50-8 (4-Ply)
Drive (Optional Wide Tire) 18 x 10.50-10 (4-Ply) 18 x 10.50-10 (4-Ply)
Rear (Dual) 13 x 5.00-6 (4-Ply) 13 x 5.00-6 (4-Ply)

TIRE PRESSURE

Deck Caster Wheel 20 PSI (137 kPa) 20 PSI (137 kPa)
Drive 15 PSI (103 kPa) 15 PSI (103 kPa)
Rear 20 PSI (137 kPa) 20 PSI (137 kPa)

DIMENSIONS (Tractor and Mower)**

Length 91 in. (231 cm) 91 in. (231 cm)
Width 49 in. (124 cm) 49 in. (124 cm)
Height 49 in. (124 cm) 49 in. (124 cm)
Wheel Base (Tractor) 42-1/4 in. (107 cm) 42-1/4 in. (107 cm)
Tread Width (Tractor) 29-3/4 in. (76 cm) 29-3/4 in. (76 cm)

8 x 3.00-4 Pneumatic (4-Ply)
11 x 4.00-5 Pneumatic

8 x 3.00-4 Pneumatic (4-Ply)
11 x 4.00-5 Pneumatic

5

Specifications

MODEL

AIR COOLED
MT (23.0 HP)
MTEFI (26.0 HP)

MOWER DECK

Width of Cut SD/GHS 42 or 48 in. (107 or 122 cm) 42 or 48 in. (107 or 122 cm)
Cutting Height 1 to 4 in. (3 to 10 cm) 1 to 4 in. (3 to 10 cm)
Height Adjustment 7 Positions - 1/2 in. (1 cm)

Increment Hitch Pins Installed
in Multi-Position Deck Support

Blade Size (Typical)

42 in. (107 cm) SD 22 in. (56 cm)

2 in. (5 cm) Center Overlap
(Two Blades, CW Rotation)

48 in. (122 cm) GHS 25 in. (64 cm)

2 in. (5 cm) Center Overlap
(Two Blades, Counter Rotate)

Deck Suspension Torsion-Flex Frame with

Caster Wheels and
Counterweight Springs

CURB WEIGHT (Approximate)

SD Tractor Only 664 lb (301 kg) MT

672 lb (305 kg) MTEFI

GHS Tractor Only 786 lb (357 kg) MT

796 lb (361 kg) MTEFI

Tractor and Mower** 984 lb (446 kg) MT

994 lb (451 kg) MTEFI

LIQUID COOLED
MTL (25.0 HP)
MTLEFI (31.0 HP)

7 Positions - 1/2 in. (1 cm)
Increment Hitch Pins Installed
in Multi-Position Deck Support

22 in. (56 cm)
2 in. (5 cm) Center Overlap
(Two Blades, CW Rotation)

25 in. (64 cm)
2 in. (5 cm) Center Overlap
(Two Blades, Counter Rotate)

Torsion-Flex Frame with
Caster Wheels and
Counterweight Springs

706 lb (320 kg) MTL
718 lb (326 kg) MTLEFI

829 lb (376 kg) MTL
841 lb (382 kg) MTLEFI

1027 lb (466 kg) MTL
1039 lb (471 kg) MTLEFI

DRIVE BELTS

Engine PTO Walker P/N 8230 Walker P/N 8230
Jackshaft Drive Gates 3VX375

(or Walker P/N 6250)
Ground Drive, Micro-V Walker P/N 7248 Walker P/N 7248
Blower (GHS Model) Gates 3VX280

(or Walker P/N 7234-2)

GHS SYSTEM (Optional)

Blower 4-1/2 x 10-1/2 x 1/2 in.

(11 x 27 x 1 cm) Three-Blade

Paddle Wheel (Driven by

Mower Engine)
Blower Brake Band Brake [Works in Combi-

nation with PTO Clutch, Stops

Blower within Five (5) Seconds

of PTO Disengagement]
Max. Blower Speed 4000 RPM 4000 RPM
Hi-Dump Option

Max. Lift Capacity

200 lb (91 kg) 200 lb (91 kg)

Gates 3VX375
(or Walker P/N 6250-1)

Gates 3VX280
(or Walker P/N 7234-2)

4-1/2 x 10-1/2 x 1/2 in.
(11 x 27 x 1 cm) Three-Blade
Paddle Wheel (Driven by
Mower Engine)

Band Brake [Works in Combi­nation with PTO Clutch, Stops
Blower within Five (5) Seconds
of PTO Disengagement]

6

Specifications

MODEL

AIR COOLED

MT (23.0 HP)

MTEFI (26.0 HP)

GHS SYSTEM (Optional) (continued)

Grass Catcher Capacity 93 Gallons (352 liters)/

10.0 Bushels

Optional Grass Catcher
Capacity

Full Signal (Grass-Pak

Powerfil

SEAT

FRAME/BODY CONSTRUCTION

Frame All Welded Unitized Steel

Body 14 Gauge Steel 14 Gauge Steel
Deck 11 Gauge Steel 11 Gauge Steel
GHS Catcher and Chutes Molded Cross-Linked

®

®

Switch) Oscillating Vane Switch

65 Gallons (247 liters)/

7.0 Bushels

Mounted on Grass Delivery

Spout Triggers Horn Signal

Oscillating Delivery Spout

Driven by 12 Volt Electric

Gearmotor Spreads Material

throughout Interior of Catcher

@ 25 Cycles/Minute

Contour-Molded, with Nylon

Backed Vinyl Cover and

Integral Foam Cushion

Chassis

Polyethylene (UV Stabilized)

LIQUID COOLED
MTL (25.0 HP
MTLEFI (31.0 HP)

93 Gallons (352 liters)/

10.0 Bushels
65 Gallons (247 liters)/

7.0 Bushels
Oscillating Vane Switch

Mounted on Grass Delivery
Spout Triggers Horn Signal

Oscillating Delivery Spout
Driven by 12 Volt Electric
Gearmotor Spreads Material
throughout Interior of Catcher
@ 25 Cycles/Minute

Full Spring Suspension with
Dampening and Adjustments
for Back Angle, Lumbar
Support, and Operator Weight.
Standard with Armrests

All Welded Unitized Steel
Chassis

Molded Cross-Linked
Polyethylene (UV Stabilized)

**Dimensions and weight shown are for 48 in. (122 cm) GHS Model (typical).

Dimensions for Tractor and Mower with 42 in. (107 cm) deck are:

Length = 88 in. (224 cm)

Width = 43 in. (110 cm)
For SD Models, subtract 7 in. (18 cm) from the height.
Deck weight for 48 in. (122 cm) Tilt-Up deck = 205 lb (93 kg). Deck sizes range from 42 to 74 in.
(107 to 188 cm), with corresponding deck weights ranging from 170 to 400 lb (77 to 181 kg).
Optional (7.0 Bushel) Grass Catcher subtracts approx. 5 lb (2 kg) and 5 in. (13 cm) in Height

NOTE: The manufacturer reserves the right to make changes in specifications shown herein at any time
without notice or obligation.

7

Component Identification

NOTE: Control Identification

shown in Operating
Instructions section.

Grass Handling System

10.0 Bushel Catcher Standard

7.0 Bushel Catcher (Optional)
(Not Shown)

Anti-Scuff

Roller

Deck

Caster Wheels

Counterweight S pring

and Protective Cover

Tilt-Up

Latch

Transmission Control Rod

Adjustment Nut (RH)

Transmission Control Rod

Adjustment Nut (LH)

Deck Lift Handle

(Cutting Height Adjustment)

Tilt-Up

Deck Handle

Catcher Lift /

Dump Handle

Turbine

Precleaner

Fuel Tank

and Cap

Deck Support Pins

and Height Adjustment

Hitch Pins

Footrests

Tilt-Up

Hook

Deck Support

Arm (LH)

Spring Clip

8

Front View and Right Side View

Component Identification

Catcher Door

Gas Spring

Instrument Panel

Guard

Left Hand

Drive Wheel

Catcher

Door

Fuel Filter

(Not Visible)

Removable Grass

Catcher Screen

(Not Visible)

Catcher Lift /

Dump Handle

Instrument Panel Box

(Shock Mounted)

Oil Drain

Plug

Muffler

Oil

Filter

Catcher

Door Handle

Anti-Scuff

Roller

Dump

Plate

Tailpipe

Tailwheel Fork

and Wheels

Rear View and Left Side View

9

Component Identification

Air Restriction Indicator

Muffler Grass

Shield

Throttle and

Choke Linkage

Oil Dipstick/Oil Fill

Rubber Bumper

(Catcher Support)

20 Amp Fuse

(Starter Solenoid)

GHS Blower

RH Hydrostatic

Transmission

PTO

Clutch Lever

RH Transmission

Lockout Lever

PTO Gearbox

Dipstick

Jackshaft

Positive (+)

Battery Cable

Battery

Donaldson Air Cleaner

LH Transmission

Lockout Lever

LH Hydrostatic

Transmission

Fuel Tank

Air Cleaner

Cover

Fuel Filter

Fuel Pickup

Line

Neutral Safety

Switch

Negative (-)

Battery Cable

Model MT

30 Amp

Circuit Breaker

Turbine

Precleaner

Fuel Pump

Muffler Heat

Shield

Air Intake

Plenum

Air Intake Hose

Precleaner

Tube

Muffler

10

Top View (Engine Compartment) Model MT

Component Identification

Air Restriction Indicator

Muffler Grass

Shield

Oil Dipstick/Oil Fill

Throttle Linkage

Precleaner

Tube

Fuel Tank

Air Cleaner Cover

Air Intake Hose

Fuel Return Line

Model MTEFI

Fuel Pickup Line

Muffler

Air Intake

Plenum

Ignition

Coil

Rubber Bumper

(Catcher Support)

Fuel Pump

Fuel Line to Engine

(High Pressure)

Donaldson Air Cleaner

Top View (Engine Compartment) Model MTEFI

11

Component Identification

Precleaner

Tube

Model MTL and MTLEFI

Muffler

Muffler Grass

Shield

Throttle Linkage

(Not Visible)

Radiator Cap

Radiator

Hose

Radiator

Guard

Radiator

Air Intake

Plenum

Fuel Tank

Air Intake Hose

Overflow

Tank

Overflow

Hose

Donaldson Air Cleaner

Air Cleaner

Cover

Fuel Pump

(Not Visible)

Air Restriction Indicator

(Not Visible)

Fuel Line to Engine

(High Pressure)

Bottom of Tank

(MTLEFI)

Oil Dipstick/

Oil Fill

Oil Pressure

Switch

Rubber Bumper

(Body Support)

Fuel Pickup

Line (MTL)

Fuel Return Line

(MTLEFI)

12

Top View (Engine Compartment) Model MTL and Model MTLEFI (Model MTLEFI Shown)

Safety Instructions

Pay particular attention to any information labeled

DANGER, WARNING, CAUTION, IMPORTANT,

and NOTE in this manual.
When you see the Safety Alert Symbol ( ),

read, understand, and follow the instructions. Fail­ure to comply with safety instructions may result in
personal injury.

The seriousness or degree of importance of each
type of information is defined as follows:

DANGER

An IMMEDIATE hazard that WILL result in
severe personal injury or DEATH, if warn­ing is ignored and proper safety precau­tions are not taken.

WARNING

A POTENTIAL hazard that COULD result in
severe personal injury or DEATH, if warn­ing is ignored and proper safety precau­tions are not taken.

Walker Manufacturing cannot predict every poten­tially dangerous situation. Therefore, items labeled
as such in this manual do not cover all conceivable
situations. Any person using procedures, tools, or
control techniques not recommended by Walker
Manufacturing must take full responsibility for safety.

The Walker Rider Lawnmower has been designed
with many safety features to protect the operator from
personal harm or injury . However , it is necessary for
the operator to use safe operating procedures at all
times. Failure to follow safety instructions con-

tained in this manual may result in personal in­jury or damage to equipment or property.

If you have any questions concerning setup, opera­tion, maintenance, or safety, please contact your
authorized Walker Mower dealer or call Walker
Manufacturing Company at [phone].

BEFORE OPERATING

1. Read and understand the contents of this

Owner's Manual before starting and operat­ing the machine. Become thoroughly familiar

with all machine controls and how to stop the
machine and disengage the controls quickly.
Replacement Owner's Manuals are available
by sending the Model and Serial Number to:

CAUTION

Possible hazards or unsafe practices that
MAY result in MODERATE personal injury
or property damage, or machine damage, if
warning is ignored and proper s afety pre­cautions are not taken.

IMPORTANT: Identifies mechanical information

demanding special attention, since it deals with the
possibility of damaging a part or parts of the ma­chine.

NOTE: Identifies information worthy of special
attention.

Walker Manufacturing Company

5925 East Harmony Road

Fort Collins, CO 80528

2. Never allow children to operate rider mower.
Do not allow adults to operate without proper
instruction.

3. Clear the area to be mowed of any foreign
objects which may be picked up and thrown by
cutter blades. Pick up all sticks, stones, wire,
and any other debris.

4. Keep ever yone, e specia lly child ren a nd pets, a
safe distance away from the area being mowed.

Do not mow with bystanders in the area.

5. Do not operate the machine barefoot or wearing
sandals, sneakers, tennis shoes, or similar
lightweight footwear. Wear substantial pro-

tective footwear.

13

Safety Instructions

6. Do not wear loose fitting clothing that could get
caught in moving parts. Do not operate this
machine while wearing shorts; always wear
adequate protective clothing, including long
pants. Wearing safety glasses, safety shoes,
and a helmet is advisable and required by some
local ordinances and insurance regulations.

7. Prolonged exposure to loud noise can cause
impairment or loss of hearing. Operator hear-
ing protection is recommended; particularly
for continuous operation of the GHS Model due
to blower noise level. Wear a suitable hearing
protective device, such as earmuffs or earplugs.

8. Keep all protective shields and safety de-
vices in place. If a protective shield, safety
device, or decal is damaged, unusable, or miss­ing, repair or replace it before operating the ma­chine.

9. Be sure interlock switches are functionin g
correctly, so the engine cannot be started un­less the Forward Speed Control lever is in the
NEUTRAL-PARK position, and the PTO clutch
is in the DISENGAGED position. Also, the en­gine should stop if the operator lifts off the seat
with either the Forward Speed Control (FSC)
out of the NEUTRAL-PARK position or the PT O
clutch in the ENGAGED position.

11. Never attempt to make any adjustments
while the engine is running, except where
specifically instructed to do so.

12. The electrical system battery contains sulfuric
acid. Avoid any contact with skin, eyes, and
clothing. Keep the battery and acid out of reach
of children.

WARNING

The engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects
or other reproductive harm.

NOTE: There is a 1 to 1-1/2 second time delay

function on the seat switch to avoid engine
power interruption when driving over bumps.

10. Handle gasoline with care. Gasoline is highly
flammable and its vapors are explosive:

a. Use an approved fuel container.
b. Never add fuel to a running engine or hot

engine (allow hot engine to cool several
minutes).

c. Keep matches, cigarettes, cigars, pipes,

open flames, or sparks away from the fuel
tank and fuel container.

d. Always fill the fuel tank outdoors using

care. Fill to about one inch from the top of
the tank. Use a funnel or spout to prevent
spilling.

e. Replace the machine fuel cap and con-

tainer cap securely and clean up any
spilled fuel before starting the engine.

14

Safety Instructions

OPERATING

1. Operate the mower only in daylight or in
good artificial light with good visibility of the area
being mowed.

2. Sit on the seat when starting the engine and
operating the machine. Keep feet on the deck
footrests at all times when the tractor is moving
and/or mower blades are operating. Never op -

erate the tractor without a deck or implement
installed.

3. For a beginning operator, learn to steer (ma­neuver) the tractor with a slow engine speed
before attempting any mowing operation.

Be aware that, with the front mounted mower
configuration, the back of the trac tor swings to
the outside during turns.

DANGER

Do not mow around overhanging tree
branches or bushes at the same height as
the operator’s torso and head where inad­vertent contact may cause injury.

7. Do not operate machine if the operator pres-

ence safety switch system is not working.

Verify proper operation by having the operator
lift off the seat with the engine running and mov­ing two controls, one at a time; (1) Move the
FSC lever out of the NEUTRAL-PARK position,
and (2) Engage the PT O Clutch. Movin g e ither
control should stop the engine after a 1-1/2 sec­ond delay.

8. Do not run the engine in a confined area
without adequate ventilation. Exhaust fumes
are hazardous and can be deadly.

9. Do not carry passengers - maximum seating
capacity is one (1) person.

10. Watch for holes, rocks, and roots in the terrain
and for other hidden hazards. When mowing tall
grass, mow higher than desired to expose any
hidden obstacles. Then, clean the area and
mow to the desired height.

11. Avoid sudden start s or stops. Before backing
the machine up, look to the rear to be sure no
one is behind the machine. Watch carefully for
traffic when crossing or working near roadways.

4. Remember , for an emergency stop , the forward
motion of the tractor can always be stopped by
pulling the Forward Speed Control (FSC) into
the NEUTRAL-PARK position.

5. In case either of the transmission drive belts
break during operation, and if the machine is on
a slope, the machine will freewheel down the
slope. To maintain control, immediately (1)
Release the steering levers and simultaneously
(2) Move the FSC to the NEUTRAL-PARK po­sition. When the machine is stopped or moving
slowly, engage the parking brake.

NOTE: The emergency stop procedure is
exactly the same procedure as used to nor­mally stop and park this machine.

6. Disengage the blade clutch and put the FSC in
the NEUTRAL-PARK position before starting
the engine (an ignition interlock switch normally
prevents starting of the machine if these con­trols are in the OPERATING positio n).

12. Disengage the blade drive when transporting
the machine across drives, sidewalks, etc. Ne-

ver raise the mower deck while blades are
rotating.

DANGER

Do not mow or dump grass within 5 f eet
(1.5 meters) of an embankment or retain­ing wall with drop off.

13. The maximum recommended side slope op­erating angle is 20 degrees or 33% grade.

When operating the machine on a slope, re­duce speed and use caution to start, stop, and
maneuver. To prevent tipping or loss of control
of the machine, avoid sharp turns or sudden
changes in direction.

14. Ne ver adjust cutting h eight with the engin e
running. Before adjusting cutting height or
servicing, disengage the blade clutch (PTO),
stop the engine, and remove the ignition key.
Wait for all movement to stop before getting off
the seat.

15

Safety Instructions

NOTE: A blade/blower brake should normally
stop drive line rotation within five (5) seconds of
disengaging the PTO clutch.

15. For side discharge mower decks, do not

operate with the grass deflector chute
removed. Keep the deflector in the lowest

possible position.

16. For tractors equipped with tilt-up deck, observe

the following recommendations:

a. Do not move tractor with deck in tilt-up po-

sition.

b. Never tilt body forward with deck in tilt-up

position.

17. For GHS equipped models, do not operate the

machine with the grass catcher in the DUMP
position or with the back door OPEN. Dan-

gerous projectiles may be thrown out of the dis­charge chute or the back of the grass catcher.

18. For GHS equipped models, use care when
closing the grass catcher door . Keep fingers
and hands away from the hinge and pinch
points when the door is being closed. Also,
keep fingers and hands clear of the door frame.
The door may slam shut with considerable
force.

19. In case of a clogged or plugged mower deck

or GHS catching system:

20. If the cutting blades strike a solid object or the
machine begins to vibrate abnormally, immedi-

ately disengage the blade clutch (PTO), stop
the engine, and wait for all moving parts to
stop. T o prevent accidental starting, disconnect

the spark plug wires. Thoroughly inspect the
mower and repair any damage be fore restarting
the engine and operating the mower . Make sure
cutter blades are in good condition and blade
nuts are torqued to 60 ft-lb (81.3 N

21. Do not touch the engine or muffler while the
engine is running or immediately after stopping
the engine. These areas may be hot enough to
cause serious burns.

22. When leaving the machine unattended, dis-

engage the blade clutch (PTO), stop the en­gine, and remove the key.

23. For Model MTL and MTLEFI, never remove
the radiator pressure cap when the engine
is hot (hot water may spray and cause

burns).

·m).

CAUTION

Use leg muscles and firm footing when lift­ing the catcher to dump; avoid bending at
the waist and using back muscles to avoid
back injury.

16

a. Disengage the blade clutch (PT O) and turn

the engine off before leaving the seat.

b. LOOK to make sure blade drive shaft and

blower drive pulley movement has stopped

before trying to unclog the system.
c. Disconnect the spark plug wires.
d. Never place hands under the deck or in the

GHS blower - use a stick or similar tool to

remove clogged material.

Safety Instructions

MAINTENANCE

1. To prevent accidental starting of the engine
when servicing or adjusting the machine, re­move the key from the ignition switch and dis­connect the spark plug wires.

2. T o reduce fire hazards, keep the engine free of
grass, leaves, excessive grease, and dirt.

3. Keep all nuts, bolts, and screws tigh t to ensu re
the machine is in a safe, working condition.
Check the blade mounting nuts frequently , mak­ing sure they are tight.

4. Perform only maintenance instructions de-
scribed in this manual. Unauthorized main­tenance operations or machine modifications
may result in unsafe operating conditions.

5. If the engine must be running to perform a main­tenance adjustment, keep hands, feet, and
clothing away from moving parts. Do not wear

jewelry or loose clothing.

6. Always use the proper engine service man­ual when working on the engine. Unautho-

rized maintenance operations or modifications
to the engine may result in unsafe operating
conditions.

11. Use care when charging the battery or per­forming maintenance on the battery and electri­cal system:

a. Make sure the battery charger is unplugged

before connecting or disconnecting cables
to the battery.

b. Charge the battery in a well-ventilated

space, so gases produced while charging
can dissipate. Make sure the battery vents
in the caps are open.

c. Keep sparks, flames, and smok ing materi-

als away from the battery at all times. To
avoid sparks, use care when removing bat­tery cables from posts.

d. Disconnect both battery cables before

unplugging any wiring connectors or mak­ing repairs on the electrical system.

IMPORTANT: Keep all applicable manuals
immediately accessible to anyone who may
operate or service this machine.

7. Altering the equipment or engine in any manner
which adversely affects its operation, perfor­mance, durability, or use will VOID the warran-
ty and may cause hazardous conditions.

8. Never attempt to disconnect any safety devices
or defeat the purpose of these safety devices.

9. Do not change the engine governor settings or
overspeed the engine. The governor has been
factory-set for maximum-safe engine operating
speed.

10. Use genuine factory replacement parts.
Substitute parts may result in product malfunc­tion and possible injury to the operat or and/or
others.

17

Safety Instructions

SAFETY, CONTROL, AND INSTRUCTION DECALS

Safety, Control, and Instruction Decals are installed on the machine;

if any are missing, illegible, or damaged, a replacement should be ordered and installed before

putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.

Each End of Mower Deck (5808 All Decks Except 52, 56, 74)

(5808-1 52, 56, 74 Decks)

Rear Cross Member of Front Body (MT and MTEFI, 8825)

SD Deck Discharge Shield (5848)

On Body Adjacent to Clutch

Control Lever (5806)

Top of Body Grass Shield (MTL and MTLEFI, 8825)

Battery Hold-Down Bar (MTEFI and MTLEFI only, 5844-2)

Rear of Grass Catcher Exhaust Screen (5869)

Adjacent to Blower Discharge Chute

through Body (5804)

Engine Shroud (5855)

18

Front Body Adjacent to

RH Steering Lever (7818)

Right Side, Behind

Operator Seat (8400-6)

Right Side, Below Operator Seat (7809)

Left Side of Operator Seat (8819)

Left Side of Operator Seat (7819)

Safety Instructions

SAFETY, CONTROL, AND INSTRUCTION DECALS

Safety, Control, and Instruction Decals are installed on the machine;

if any are missing, illegible, or damaged, a replacement should be ordered and installed before

putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.

Bridge Assembly and LH Gear Axle (5810-3)

Deck Carrier Frame (8647)

Deck Gearbox Cover (5807-3)

Deck Carrier Frame (8653)

Deck Carrier Frame (5865)

Top of Blower Housing (5819)

Catcher Door Hinge Bar,

LH and RH Sides (5868)

On Engine (6810)

Catcher Safety Latch,

RH Side (5874)

(7.0 Catcher only)

Gear Axle (5810-1)

Jackshaft Support Adjacent

Hydrostat Oil

Reservoir

to Dipstick (7827)

Instrument Panel MT (8823-2), MTEFI (8823-3), MTL (8823-4), MTLEFI (8823-5)

Fender, RH Side (7802)

19

Assembly Instructions

SETUP INSTRUCTIONS

Walker Mowers are shipped partially assembled.
After uncrating the tractor and mower deck, initial
setup is required.

NOTE: During the process of unpacking, any dam­aged or missing parts sh ould be note d and reporte d
to the delivering carrier immediately (put in writing
within 15 days). The carrier will provide directions
for proceeding with a claim to receive compensation
for damage.

Tire Installation (Tractor)

 Install the drive tires using the eight (8) lug bolts

that are supplied with the owne r's packet of ma teri­als. Bolts are torqued to 75 to 85 ft-lb. Drive tires are
18 x 9.50-8, 4-ply; rear tires are 13 x 5.00-6, 4-ply.

 Check and adjust the inflation of the tires. The

tire inflation recommendations are:

Drive = 15 PSI (103 kPa)
Rear = 20 PSI (137 kPa)

Battery Service

CAUTION

Important Battery Service, Inst all ation, and
Changing Tips for MTEFI/MTLEFI:

 Do not allow the battery cables to touch

opposing terminals. When connecting
battery cables attach the positive (+) cable
to positive (+) battery terminal first, followed
by negative (-) cable to negative (-) battery
terminal.

 Never start the engine when the cables

are loose or poorly connected to the
battery terminals.

 Never disconnect battery while engine is

running.

 Never use a quick battery charger to

start the engine.

 Never "jump start" the engine using

another source. Electricity fluctuations can
damage the ECU (Electronic Control Unit).

 Always disconnect negative (-) battery

cable lead before charging battery, and
also unplug harness from ECU before per­forming any welding on equipment.

Raise front mower body up for battery access (refer
to Front Body Latch Release in Operating Instruc-
tions). Check the battery for electrolyte level and
charge. The electrolyte level should be at the bot­tom of the vent wells [1/4 to 1/2 in. (6 to 13 mm)
above plates]. If the specific gravity is less than

1.225, the battery needs charging. If th e battery has
been shipped dry, or is wet but needs service, refer
to the following instructions.

IMPORTANT: Make sure battery is securely
mounted in the frame. A loose battery may cause
damage to the case resulting in acid leakage an d se­vere damage to the machine. A hazard may be cr e­ated by damage to critical working parts and safety
systems.

Wet Battery Service

If the battery has been shipped wet, but the electro­lyte level is low or the battery needs to be charged
then:

1. Fill each battery cell with distilled water to the
bottom of the vent wells.

2. Charge battery. Refer to Battery Charging in
this section.

Dry Battery Service

DANGER

Activating a battery can be dangerous.
The battery should be taken to a reliable
service station, battery store, or power
equipment dealer where a trained techni­cian can activate the batter y safely. DO
NOT attempt to activate the battery unless
you are experienced in battery service
work. The following activation and charg­ing instructions are provided for u se b y a
trained battery technician.

20

Assembly Instructions

DANGER

Battery electrolyte is a poisonous and cor­rosive sulfuric acid solution.

 Avoid spillage and contact with skin,

eyes, and clothing - causes severe burns.

 To prevent accidents, wear safety gog-

gles and rubber gloves when working with
electrolyte.

 Neutralize acid spills with baking soda

and water solution.

T o fill (activate) battery with electrolyte (if battery has
been shipped dry):

1. Remove the battery hold-down bar, disconnect
the battery cables and lift the batt ery out of the
tray.

IMPORTANT: Battery must be removed from
the mower before filling with electrolyte.

IMPORTANT: Obtain and use only battery
grade sulfuric acid electrolyte with a 1.265 spe­cific gravity to activate the battery. DO NOT use
water or any other liquid during initial activation.

2. Remove the filler caps and carefully fill each cell
until the electrolyte is just above the plates.

3. After the battery is filled with electrolyte, replace
the filler caps and charge the battery. Refer to

Battery Charging.

Battery Charging

DANGER

BA TTERIE S PRODUC E EXPLOSIVE GA SES

 Charge the battery in a well-ventilated

area, so that gases produced while charg­ing can dissipate.

 Keep sparks, flames, and smoking mate-

rials away from the battery at all times.

 Make sure the battery cap vents are

open after the battery is filled with acid
(check manifold vent on each cap).

 Make sure the battery charger is unplug-

ged before connecting or disconnecting
cables to the battery.

IMPORTANT: On MTEFI and MTLEFI models, al-

ways disconnect the negative (-) battery terminal be­fore charging. Failure to do so can re sult in damage
to the ECU.

1. Charge the battery at 15 amps for 10 minutes.
DO NOT exceed 20 amps maximum recom­mended charging rate. Charge until specific
gravity is at least 1.250. Total charging time
should not exceed one (1) hour.

2. After charging the battery, adjust the electrolyte
level to the bottom of the vent wells [1/4 to 1/2 in.
(6 to 13 mm) above the plates].

IMPORTANT: DO NOT overfill the battery.
Electrolyte will overflow through the vented caps
onto parts of the machine and WILL result in
severe corrosion.

3. Install battery.

21

Assembly Instructions

Battery Clamp

Secured by

Wing Nut(s)

Battery Protector

Plate in Place

(+) Battery Cable

Connection

Spacer Washer

Axle Spacer Tube

Grease Fitting

Locations

Attach Guard

Attach

Chute

Nut on Top

Carrier Frame
Tube Sockets

Battery Installation

IMPORTANT: Make sure battery is securely mount­ed in the frame. A loose battery may cause damage
to the case resulting in acid leakage and sever e dam­age to the machine. A hazard may be created by
damage to critical working parts an d safety systems.

Install the battery in the mower as shown in Battery
Installation photo. Connect the positive (+) first and
then the negative (-) cable to the proper battery ter­minal [red cable and boot connects to the Posi-
tive (+) terminal]. Slide the rubber boot up and over
the battery post, making sure it covers the post com­pletely to prevent an electrical short.

WARNING

Make sure the battery cap vent s are open.
Improper venting of the battery COULD
cause a battery explosion.

3. Insert the 3/8-16 x 4-1/2 in. bolt through the
wheel fork with the bolt head to the outside and
install the 3/8-16 in. Keps nut.

4. Tighten the bolt and nut until the axle spacer
tube bottoms against the inside of the wheel
fork (will not turn) while the wheel and spacer
washers (if used) spin freely without binding.

Deck Caster Wheel Installation

5. Grease the caster wheel bearings and caster
pivot bearings - one grease fitting for each
wheel and each pivot.

Mower Deck Assembly

Deck Caster Wheels Installation

1. Remove the bolt, nut, axle spacer tube, and

2. Fit the axle spacer tube through the wheel hub,

22

Battery Installation

spacer washers from each deck caster wheel
fork.

NOTE: Spacer washers are used only when the
optional foamed rubber deck wheels (8 x 3.00)
are installed.

position the spacer washer on each side of the
hub (if used), and fit the assembly into the wheel
fork.

Deck Discharge Chute Installation (GHS Rear Discharge Models Only)

Mount the discharge chute hinge on top of the deck
discharge opening using the 1/4-20 x 1/ 2 in. socket
button head screw and 1/4-20 ESNA nut. Position
the screw with the head inside of the chute and the
nut on the outside. Attach spring for tilt-up ac tion
from chute to bracket on deck.

Discharge Chute and PTO Shaft Guard

Installation on Rear Discharge Deck

Assembly Instructions

Attach Shield

Roller Wheels

Attach Spring

PTO Tube

Quick Coupler

Installation Tool

Pull Back Spring-Loaded

Coupler Ring

Deck Discharge Shield Installation (Side Discharge Models Only)

Attach the deck side discharge shield by positioning
the shield hinge lug in front of the deck mount and
fastening with two (2) 3/8-16 x 1-1/4 in. bolts, 3/8-16
ESNA nuts, and 3/8 in. wave spring washers. The
wave washers fit between the two hinging surfaces.
Tighten the nuts until the shield moves freely but is
not loose.

WARNING

DO NOT operate the machine without the
grass deflector chute attached and in the
lowest possible position.

Discharge Shield Installation

on Side Discharge Deck

PTO Shaft Guard Installation

Position the shaft guard and mount with two (2)
1/4-20 x 1/2 in. bolts.

Tilt-Up Spring and Roller Wheel

Installation on Rear Discharge Deck

Mower Deck Installation on Tractor

Deck Installation

1. Lightly grease each deck support arm (2) on the
tractor. Refer to Mower Deck Installation
photo for location of deck support arm.

2. Engage the deck carrier frame tube sockets on
the tractor support arms (refer to Discharge

Chute and PTO Shaft Guard Installation

photo for socket location), slide the deck onto
the support arms approximately 3 in. (76 mm).

3. Retract spring-loaded coupler ring on the PTO
Tube (provided in owner’s packet) and insert
coupler tool. Refer to Quick Coupler Installa-
tion Tool photo.

Tilt-Up Roller Wheel Installation

Mount the two (2) tilt-up roller wheels on the brack­ets on the rear skirt of the deck hous ing using the
P/N 8490 axle bolt, 3/8 in. wave s pring wash er and
3/8-16 in. Whiz locknut. Tighten the axle bolt until
the wheel rolls freely, but is not loose.

Quick Coupler Installation Tool

23

Assembly Instructions

PTO Connection

Grease Deck

Support Arms

Arrows on Shaft and Tube

(used to align when sliding together)

Spring-Loaded Coupler Ring

In Fully Forward Position

Spring Tension Adjustment

Nut Located Under Lower

Spring Hook (Not Visible)

Counterweight Springs Clip

Onto Body With Forward

Body Tilted Up

Hitch Pins

Lock Deck On

Support Arms

4. Reaching under the tractor, join the PTO tube to
the PTO shaft (align arrow decals). Slide the
PTO tube onto the spline shaft on the tractor
PTO gearbox.

NOTE: When installing the DSD52 Mower
deck, make sure to retract the dolly wheel after
mounting the deck on the tractor.

Coupler Ring “Locked” Position

8. Raise the mower body (instead of lifting the
front of deck) and clip the counterweight springs
to the receptacle on front of body. Lower the
body to tension the springs. (Refer to Deck

Counterweight Spring Installation photo.)

Mower Deck Installation

(PTO Shaft Connection )

5. Slide the deck the rest of the way on the deck
arms. If the deck is rear discharge (GHS
equipped model), the rear discharge chute will
need to be aligned and connected to the blower
inlet during the last 2 in. (51 mm) of slide action
on the support arms.

NOTE: Raising the mower body may be help­ful in fitting and guiding the deck chute into the
blower .

6. Install the hitch pin throug h the hole on th e end
of each support arm to lock the deck in place
(refer to Deck Counterweight Spring Installa-
tion photo). Two (2) hitch pins are included in
the owner's packet of materials.

7. Remove Installation Tool from coupler ring and
make sure the ring has “snapped” securely on
the spline shaft.

IMPORTANT: DO NOT operate tractor with
Quick Coupler Installation Tool installed.

IMPORTANT: To prevent damage to the
mower, make sure the PTO shaft assembly is
securely locked on the tractor, with the locking
balls fully seated in the groove and the ring in the
full forward position (refer to the Coupler Ring
“Locked” Position photo). After installation,
pull on the shaft to check for security .

9. With the counterweight springs connected, the
weight on the deck caster wheels should be
15 to 25 Ib (6.8 to 11.3 kg); this adjustment is
preset at the factory . If re quired, the spring ten­sion can be adjusted by tightening or loosening
the elastic stop nuts located underneath the
lower spring hook, or contact your local dealer if
additional help is required. Refer to Deck

Counterweight Spring Installation photo.

Deck Counterweight Spring Installation

24

Assembly Instructions

Should be 1/8 in. (3 mm)

to 1/4 in. (6 mm) higher

at the rear of the blade

4 in. (102 mm)

Wood Block

4 in. (102 mm)

Wood Block

Should not vary more

than 1/8 in. (3 mm)

side-to-side

Deck Leveling

1. Position mower on a smooth, level surface. Set
the cutting height to the highest position - 4 in.
(102 mm) - for easy access under the deck to
measure blade height. Refer to ADJUSTING

CUTTING HEIGHT in Operating Instructions.
NOTE: A block of wood cut 4 in. (102 mm) high

is a convenient gauge to measure blade height
above ground during the leveling process.

WARNING

The machine must be shut off during this
procedure.

2. Check the side-to-side level. Rotate each bla de
sideways and measure the distance from blade

tip to ground on each side. If measurements
vary more than 1/8 in. (3 mm), add a washer
shim under the deck support pins on the low side
to level the deck.

3. Check the front-to-rear level. Rotate the blades
to point forward. Measure the distance from
blade tip to ground on the front and rear. The
rear of the blade should be 1/8 to 1/4 in.
(3 to 6 mm) higher than the front of the blade;
shim the rear (or front) deck support pins
equally to achieve at least 1/8 in. (3 mm) differ­ence.

NOTE: The mower deck and support frame are
jig welded; within normal tolerances, very little, if
any, shimming should be required to level the
deck. Tire pressure will influence the levelness
of the deck. Check the tire pressure as a possi­ble cause of the deck not being level.

Deck Leveling

25

Assembly Instructions

PREOPERATING CHECKLIST

Before operating the mower for the first time, and as
a routine before daily operations, it is important to
make sure the mower is properly prepared and
ready for operation. The following is a list of items to
be checked. (For a mower with frequent operation,
some of these items will not need to be checked ev­ery day , but the operator should be aware of the con­dition of each.)

For proper fuels and lubricants refer to Specifica-

tions.

FILL FUEL TANK

Fill the fuel tank using clean, fresh automotive grade
unleaded gasoline (87 octane rating minimum).

DANGER

Handle gasoline with care. Gasoline is
highly flammable and its vapors are ex­plosive. Use safe refueling procedures:

IMPORT ANT: DO NOT mix oil with gasoline. Al-
ways use fresh, automotive grade gasoline. DO
NOT use premium, white, or high-test gasoline. DO
NOT use additives, such as carburetor cleaners, de-

icers, or moisture removing agents. DO NOT use
gasoline blended with methyl alcohol.

CHECK ENGINE CRANKCASE OIL LEVEL

Check the engine crankcase oil level before use and
after each 8 hours of continuous operation. Refer
to LUBRICATION for Checking Engine Crankcase
Oil Level in Maintenance Instructions.

CHECK AND SERVICE ENGINE AIR CLEAN-

ER SYSTEM

 Check air restriction gauge to make sure there

is no red indication showing.

 Check condition, cleanliness, and security of

the complete air cleaner system (every 100
hours). For detailed procedures, refer to
CLEANING the Engine Air Clea ner System in
Maintenance Instructions.

 DO NOT fill fuel tank with the engine run-

ning.

 If the engine is hot, allow to cool before

refueling.

 Use an approved fuel container.
 Fuel the mower outdoors.
 DO NOT smo k e wh il e re fu e li ng .
 Avoid spilling fuel; use a funnel or spout.
 DO NOT overfill the fuel tank; fill up to

about 1 in. (25 mm) below the top of tank.

IMPORTANT: DO NOT permit dirt or other foreign

matter to enter the fuel tank. Wipe dirt from around
the filler cap before removing. Use a clean fuel stor­age container and funnel.

CHECK ENGINE COOLING SYSTEM - Model

MT and MTEFI

Check that the engine cooling air intake screen is
free of obstruction by grass clippings or debris and
clean if required. Also, cylinder head cooling fins
should be inspected and cleaned if any build-up of
debris is noted [remove two (2) cylinder head ac­cess panels to inspect and clean].

Check performance of the cooling system by start­ing the engine, holding a hand adjacent to the cylin­der heads, and feeling the cooling airflow .

DANGER

Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.

26

Assembly Instructions

Tilt-Up Latch

Deck Lock Lever

CHECK ENGINE COOLING SYSTEM - Model

MTL and MTLEFI

 Check the radiator air intake screen to make

sure the screen is clean and free of obstruction.
Also, the radiator cooling fins should be
inspected and cleaned if there is any buildup of
dirt or debris. (Remove the intake screen
assembly to inspect and clean.)

 Check the coolant levels in the radiator and over-

flow tank. If additional coolant is needed, refer to

CHECKING/SERVICING the Engine Cooling
System - MTL and MTLEFI in Maintenance
Instructions.

WARNING

DO NOT remove the radiator pressure cap
when engine is hot.

CHECK GEAR AXLE OIL LEVEL

Refer to LUBRICATION for Gear Axle Lubrication
in Maintenance Instructions.

CHECK TIRE PRESSURE

Deck Caster Wheel = 20 PSI (137 kPa)
Drive = 15 PSI (103 kPa)

Rear = 20 PSI (137 kPa)

CHECK AND CLEAN GRASS BUILDUP

UNDERNEATH MOWER DECK (and inside
GHS blower, if equipped)

Refer to CLEANING the GHS Blower in Mainte-
nance Instructions for blower cleaning information.

DANGER

Never operate cutter blades wi th deck in
raised position because it is hazardous.

The tilt-up deck can be secured in the raised position
by unlocking the deck lock levers on each side of the
carrier frame and inserting the deck hook into the tilt­up latch on the tractor body. Before operating the
tractor, make sur e to re-engage the deck lock levers
after lowering the deck to the normal operating po­sition.

INSPECT FOUR (4) DRIVE BELTS

Engine PTO Drive, Jackshaft Drive, Hydrostatic
Ground Drive, and GHS Blower Drive (if equipped).

CHECK HYDROSTATIC TRANSMISSION OIL

LEVEL

Refer to LUBRICATION for Checking Hydrostatic

Transmission Fluid Level in Maintenance Instruc­tions.

CHECK FUNCTIONS OF INSTRUMENT PANEL

AND WARNING HORN

Turn the ignition key to the RUN position. V oltmeter ,
Oil Pressure Light, and Warning Horn shou ld all op­erate, indicating normal function.

CHECK FUNCTION OF SAFETY INTERLOCK

SWITCHES

Refer to Operating Instructions to check for proper
operation of safety switches, both during engine
starting and with this operator leaving the seat with
tractor moving forward or with the mower b lades en­gaged.

Tilt-Up Latch

Tilt-Up Hook

on Deck

Deck Secured in TILT-UP Position

CAUTION

Do not operate machine with deck tilt- up
pivot joint unlocked.

27

Assembly Instructions

DANGER

Do not operate the mower with deck in tilt­up position. Do not move the tractor with
the deck in the tilt-up position.

CHECK MOWER BLADE CONDITION, SHARP-

NESS, AND SECURITY OF MOUNTING

The blade mounting nut should be tightened to
60 ft-lb (81.3 N
refer to CHECKING/SERVICING for Sharpen
Mower Blades in Maintenance Instructions.

ADJUST MOWER CUTTING HEIGHT, IF RE-

QUIRED

Position the hitch pins in the four deck support pins.
Refer to the “Cutting Height Adjustment” decal on
the deck gearbox cover.

·m). If blade sharpening is required,

CHECK DRIVE WHEEL BOLT TORQUE

The lug bolts mounting the drive tires should be
tightened to 75 to 85 ft-lbs. (101.7 to 115.2 N

PERFORM ANY ADDITIONAL PROCEDURES

called for on the MAINTENANCE SCHEDULE
CHART in Maintenance Instructions.

·m).

28

Operating Instructions

Blade Clutch (PTO)

Front Body

Latch Release

(not visible)

Parking

Brake

Forward Speed Control

(FSC)

Steering Levers

CONTROL IDENTIFICATION, LOCATION, AND FUNCTION

Operating Controls

CAUTION

Before operating the mower, become fa­miliar with the location and function of all
operator controls. Knowing the location,
function, and operation of these controls
is important for safe and efficient ope ra­tion of the mower.

Engine Choke - (Model MT and MTL only)

The choke control lever (black knob) is located on
the left side of the seat. T o st art a cold engine, move
the choke control forward to the ON position. After
engine starts, move the choke control toward the
OFF position, keeping enough choke to allow the
engine to run smoothly as it warms up. As soon as
possible, move the choke to the OFF position. A
warm engine requires little or no choke for starting.

IMPORTANT: Make sure the choke is in the OFF
position during normal engine operation; running
with the choke in the ON position CAN da m ag e the
engine.

Operating Controls

29

Operating Instructions

Throttle Choke

Steering Levers

Each drive wheel is controlled by its own indepen­dent steering lever, for both steering function and
FORWARD/REVERSE motion. The FSC lever sets
the maximum forward speed, and also sets the for­ward position of the steering levers. The steering le­vers operate only with a backward pulling
movement of the lever, which causes the drive
wheel for that lever to first slow down, stop, and then
reverse with a full backward lever stroke. The levers
are released to the FORWARD position for “straight-
ahead” ground travel.

Choke and Throttle Location (MT and MTL)

Engine Throttle

The throttle control lever (red knob) is located on the
left side of the seat and is used to control engine
speed. Moving the lever forward toward the FAST
position increases engine speed; moving it back-
ward toward the IDLE position decreases engine
speed.

Forward Speed Control (FSC)

Forward Speed Control (FSC) has two functions:
One is to set forward travel speed, and the other is
to establish the NEUTRAL-PARK position. When
the FSC lever is moved into the FORWARD posi­tion, a friction lock holds any forward speed setting
from 0 to 5 mph (0 to 8 km/h). The ground speed is
proportional to the lever position; the further the le­ver is advanced forward, the faster the tractor
moves. It is not necessary to hold the FSC in posi­tion since the friction lock maintains the selected le­ver position. Pulling back on the steering levers
overrides the FSC setting an d slows or stops for­ward travel. Releasing the steering levers allows
the tractor to resume forward travel at the speed set
by the FSC lever. To stop and park the machine, the
FSC lever is moved backward to the NEUTRAL-

PARK position.

NOTE: Pushing forward on the steering levers will

not cause any change in tractor motion - there will
be no steering lever reaction and there will be no
machine damage.

Blade Clutch (PTO)

The blade clutch lever has two positions. Pulling the
lever UP engages the PTO that drives the mower
blades. Pushing the lever DOWN disengages the
PTO and engages the blade brake.

NOTE: On GHS equipped models, the Powerfil
motor and Grass-Pak® full signal switch are activat­ed by engaging the blade clutch. Refe r to Using the
GHS Catcher in this section for a complete descrip­tion of GHS operation.

Parking Brake

The parking brake functions by locking a pin into the
hydrostatic transmission pinion gear teeth. Moving
the lever FORWARD engages the parking brake;
moving the lever BACKWARD releases the brake.

IMPORTANT: Stop the tractor completely before
engaging the parking brake. The parking brake
uses a positive mechanical lock similar to the PARK
position on an automotive automatic transmission.
If the tractor is moving when the brake is engaged, it
will result in sudden stoppage and possible internal
damage to the axle drive.

®

30

NOTE: If pressure on the parking brake pin (e.g.
parked on a hill) makes it impossible to release the
parking brake with the parking brake leve r, move the
mower gently forward or backward to release the
pin.

Operating Instructions

THROTTLE

BLADE CLUTCH (PTO)

Pull Up to Engage

PARKING

BRAKE

LEFT WHEEL

STEERING LEVER

Forward Position

(No Control Change)

Neutral-Park

Position

Reverse Drive

Wheel Motion

Position

RIGHT WHEEL

STEERING LEVER

The Forward S peed Control also Establishes the Neutral-Park Position of the Steering Levers

FORWARD SPEED

CONTROL LEVER (FSC)

Full Forward

Ground Speed

Position

Intermediate

Ground Speed

Position

Neutral-Park

Position

Disengaged

Position

Idle

Position

ON Position

OFF Position

CHOKE (MT & MTL)

Engaged

Position

Fast

Throttle

Position

Engaged

Position

Disengaged

Position

MTL MTEFI MT

MTLEFI

MT, MTEFI, MTL, and MTLEFI Operating Controls (Top View from Drivers Point of View)

31

Operating Instructions

Front Body

Latch Release

Transmission

Plunger

Lockout

Levers

Cold Start Lever

Disengaged

Cold Start Lever

Engaged

Front Body Latch Release

The front portion of the tractor body hinges forward
for maintenance access and is latched down in the
OPERATING position. To raise the body, move the
latch release forward.

Front Body Latch Release

Transmission Lockout Levers

The transmission lockout levers disengage the hy­drostatic transmissons. By lifting the lever on top of
the transmission and locking it into place with the
lockout cam, the hydrostatic transmissio ns are re­leased to permit freewheeling. By releasing the cam
and lowering the lever, the transmissions are en­gaged for normal operation. The transm ission lever
in the LOCKOUT position is used to enable moving
the machine without the engine running (e.g., for
service). Refer to TRANSMISSION LOCKOUT in
this section for operating instructions.

NOTE: The transmission plunger on the side of the
transmission case (activated by the LOCKOUT LE-
VER) must be completely released during operation
of the mower, otherwise operation of the transmis­sion will be erratic.

Optional Cold Start Lever (Jackshaft Drive Belt Release)

The cold start lever is used for starting the machine
in cold weather [below 40° F (4° C)]. Pulling the le­ver UP disengages the jackshaft drive belt. When
the jackshaft drive belt is released, the hydrostatic
transmissions are removed from the engine starter
cranking load.

Optional Cold Start Lever

Normal Operating Position

32

Lockout Lever Location

Optional Cold Start Lever

Cold Start Position

Operating Instructions

Suspension Seat (MTL and MTLEFI)

A fully adjustable suspension seat is standard on
Models MTL and MTLEFI. This seat is adjustable
for back pitch, weight, lumbar support and armrest
inclination. Proper adjustment for each operator is
essential to safe operation and operator comfort.

Read operating instructions in full before you use
the seat.

NOTE: Driver seats that have been adjusted incor­rectly have little or no vertical travel with the operator
in the seat. To prevent damage to the driver’s back
and to the seat, the seat must be adjusted for the
driver’s weight before use and before every

change of driver. To prevent injury, no objects
should be placed within the moving area of the

driver seat.

CAUTION

To eliminate any risk of accident, the set­tings must be checked to ensure they are
correctly engaged before the mower is
driven.

Adjustments must not be made while driving.
If you make any changes to the suspension seat

(for example fitting parts which are not original
GRAMMER parts) it may no longer meet the safety
standards to which it is tested. Functions may be

impaired, threatening your safety. For this reason,
any change in design of the seat must be ap-
proved by GRAMMER (Seat Manufacturer).

IMPORTANT: Fasteners must be checked regu­larly for tightness. If the seat wobbles there may

be loose bolts or other faults.

CAUTION: Before the tractor is used, the safety
switch must be checked for proper function. The
operation of the switch is checked by having the op­erator lift off the seat with the tractor moving forward
and/or the blades engaged -- this action should
cause the machine to stop. If a malfunction is de­tected the tractor must not be driven, it should be r e­paired or replaced before operating the mower.

CAUTION

Except for the driver’s weight during nor­mal use, no loads must be placed on
seats with a built-in switch detecting se at
occupation, as the vehicle may ot he rwise
start to move by itself.

For armrest inclination adjustment, the inclina-

tion of the armrests can be modified by turning the
adjustment knob. Refer to Figure 1.

Turning the knob to the right lif ts the armrest in front,
turning it to the left, lowers it in front.

For weight adjustment, the weight of the respec­tive driver must be set while sitting on the seat . Fold
out the weight adjustment handle completely, hold it
at the front and move it upwards or downwards (10
movements from minimum to maximum).

Before every new movement, bring the handle back
to the starting position (audible locking sound). The
driver’s weight has been set correctly, when the ar­row is in the middle of the viewing window . Refer to

Figure 2.
IMPORTANT: To prevent injury to the operator and/

or damages to the seat, the settin g for the driver’s
weight must be checked and adjusted as necessary
before the mower is driven.

If you note that the seat does not function correctly
(for example a defective seat suspension; improper
curving of the lumbar support or damaged bellows),
contact your Walker dealer immediately to ar­range for repairs to be carried out. If you fail to do
so, your health may be affected and the risk of ac-

cident increased.

When the minimum/maximum weight adjustment
has been reached, you will notice an empty move­ment in the handle.

When you have set the weight, fold the handle com­pletely into the locking position.

33

Operating Instructions

Remove

Cover

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

For Backrest adjustment, moving the adjustment

handle upwards loosens the notchi ng of the back­rest adjustment. Refer to Figure 3.

After the adjustment, the handle must lock in the de­sired position. It should not be possible to move the
backrest into another position when it is locked.

For Armrest height adjustment, the armrests can
be folded back if required and the height individually
adjusted.

For adjusting the height of the armrest, pry out the
round cap (arrow) of the cover and loosen the hexa­gon nut (size 13mm) situated behind it. Set the arm­rests in the desired position (5 steps) and tig hten the
hexagon nut. Replace the cap onto the nut. Refer
to Figure 4.

For Lumbar Support adjustment, turning the knob
upwards sets the curve in the upper pa rt of the back
upholstery. Turning the knob downwards sets the
curve in the lower part of the upholstery. Refer to

Figure 5.
IMPORTANT: Dirt can impair the function of the

seat, so make sure you keep your seat clean!
For cleaning, use a standard commercially avail-

able upholstery or plastics cleaning agent. Test
first for compatibility on a small, concealed area.

34

Operating Instructions

Hourmeter

Light Switch

(Optional)

Ignition

Switch

Warning

Horn

Warning

Horn

Ignition

Switch

Light Switch

(Optional)

Voltmeter

Hourmeter

7 AMP

Circuit Breaker

7 AMP

Circuit Breaker

MT

MTEFI

Over Temperature

Warning Light

Oil Pressure

Warning Light

Voltmeter

Over Temperature

Warning Light

Oil Pressure

Warning Light

Service
Engine

Soon Warning

Light

Instrument Panel

This illustration shows the configuration of the
switches and indicators located on the instrument
panel.

Instrument Panel

35

Operating Instructions

Warning

Horn

Ignition

Switch

Light Switch

(Optional)

Voltmeter

Hourmeter

7 AMP

Circuit Breaker

10 AMP

Circuit Breaker

MTLEFI

Warning

Horn

Ignition

Switch

Light Switch

(Optional)

Voltmeter

Hourmeter

7 AMP

Circuit Breaker

10 AMP

Circuit Breaker

MTL

Water Temperature

Warning Light

Oil Pressure

Warning Light

Water

Temperature

Gauge

Water Temperature

Warning Light

Oil Pressure

Warning Light

Water

Temperature

Gauge

Service

Engine

Soon Warning

Light

36

Operating Instructions

Hourmeter

The hourmeter, which is located on the instrument
panel, displays operating time accumulated while
the ignition switch is in the ON position.

The hourmeter provides maintenance reminders
after certain hours of operation. The hourmeter
screen will start flashing the reminder one hour prior
to the recommended interval and will continue until
one hour after the recommended interval (two
hours). The hourmeter does not have a manual

reset function.

Procedure Interval* Reminder

Oil Change
(Break-In)**

Lubricate
and Check
Levels

Oil Change

4-6 Hours

24-26 Hours LUBE

49-51 Hours***

C

OIL

H
G

C

OIL

H
G

* These intervals reflect the actu al time that the

reminder will flash (one hour prior to and one

hour after the recommended interval).
** This reminder is only used one time.
*** In normal operating conditions, oil changes in

100-hour intervals are acceptable. Walker and

the engine manufacturers recommend engine

oil changes every 50 hours in extremely dirty

or dusty conditions or for units with less than

100 hours annual use.

Voltmeter

The voltmeter displays battery and charging system
voltage. An indication of low or high voltage (the red
area) indicates an electrical system failure. The
cause of the failure should be determined and cor­rected.

Oil Pressure Warning Light

The oil pressure warning light indicates that engine
oil pressure is below the safe operating level [below
3 to 5 PSI (21 to 34 kPa)]. This light (and warning
horn) will come on when the ignition is turned ON, but
should go off after the engine is started. If the light
fails to come on when the ignition switch is turned ON,
it could indicate a burned out bulb. If the light comes
on during engine operation, stop the engine imme­diately and correct the source of the problem before
further engine operation.

IMPORTANT: Continued operation of the engine
with an illuminated oil pressure warning light MAY
cause severe engine damage (if a low oil pressure
condition exists).

Over Temperature Warning Light (Model MT and MTEFI Only)

The over temperature warning light indicates that
engine oil temperature and/or cylinder head tempe r­ature are above the safe operating limit and the en-
gine is overheating [above 305° F (152° C) oil or
450° F (232° C) cylinder head]. If this light comes
on, there may be a problem with:

NOTE: The blinking hour glass on the display
means that the meter is operating properly.

Hourmeter

 Engine cooling system (material packed into cyl-

inder head cooling fins, clogged air intake screen)

 Low oil level in crankcase

Stop the engine and correct the source of the prob­lem before further operation.

IMPORTANT: Continued operation of the engine
with an illuminated over temperature warning light
MAY cause severe engine damage (if a high oil tem­perature or head temperature condition exists).

37

Operating Instructions

ON

OFF

START

Water Temperature Warning Light (Model MTL and MTLEFI Only)

The water temperature warning light indicates that
engine coolant temperature is above the safe oper­ating limit and the engine is overheating. If this
light comes on, there may be a problem with:

 Radiator cooling air flow (material packed into

radiator cooling fins, clogged air intake screen)

 Cooling fan no t op erating
 Low coolant quantity in cooling system

Water Temperature Gauge (Model MTL and MTLEFI Only)

The water temperature gauge monitors engine
cooling system temperature. If engine coolant
temperature exceeds 230° F (110° C), an overheat
condition exists; the water temperature light will
come on and the warning horn will sound.

WARNING

Ignition Switch

The ignition switch is used to start and stop the en­gine. The switch has three positions: “O” is the OFF
position, RUN is the position the key returns to after
starting, and “S” is the START position. When start-
ing the engine, turn the key clockwise to the “S” po­sition. Do not hold the key in the “S” position longer
than 10 seconds. If the engine does not start, return
the key to the “O” position for at least 60 seconds be­fore making a restart attempt. Pro longed cranking
can damage the starter motor and shorten battery
life. Release the key when the engine starts, and it
will return to the “RUN” position. To stop the engine,
rotate the key counterclockwise to the “O” position.

If engine cooling system overheating is

indicated, continued operation of the en-

gine, even for a short time, COULD resul t

in fire, risk of personal injury, and severe

damage to equipment.

Engine Service Light (Model MTEFI and MTLEFI Only)

The engine service light indicates the Engine Con­trol Unit (ECU) has detected a fault in the eng ine
performance. When this light illuminates during op­eration, contact an authorized Kohler Service de aler
to diagnose the fault.

IMPORTANT: Continued operation of the engine
with an illuminated engine service light will result in
sub-standard performance and MAY cause engine
damage if not corrected as soon as possible.

Ignition Switch

Light Switch (For Optional Lights)

Operates headlights (when installed).

Warning Horn

The warning horn sounds to alert the operator that
an unsafe engine condition is being indicated ­when engine temperature is too high or engine oil
pressure is too low. If the horn sounds, check the
indicator lights and correct the problem before fur­ther operation.

38

Operating Instructions

Cold Start Lever

Engaged

Circuit Breakers

Depending on model, either one or two manual reset
circuit breakers are located on the instr ument panel.
Each has a button that pops out if the circuit breaker
trips. For Models MT , MTEFI and MTL EFI, the 7 amp
circuit breaker protects the safety circuits and GHS.
For Model MTL, the 7 amp circuit breaker protects
the warning lights/horn, safety circuits and GHS. Fo r
Model MTL, the 10 amp circuit breaker prot ects the
headlights. For Model MT , the 30 amp circuit breaker
(located near the battery) protects the instrument
panel and headlights. For Model MTL, the two (2) 30
amp circuit breakers protect the instrument panel,
starter solenoid and ’fan’ control module. For Models
MTEFI and MTLEFI, the 30 amp circuit breaker pro­tects the instrument panel, headlights, and starter
solenoid, and a 20 amp fuse protects the ECU.

STARTING THE ENGINE

CAUTION

Before operating the mower , read and un-

derstand all Safety Instruc tions and Operat-

ing Instructions.

CAUTION

A safety interlock switch system PRE­VENTS CRANKING the engine with either
the Forward Speed Control or the blade
clutch (PTO) out of neutral. If the engine
cranks otherwise, the safety system is not
working and should be repaired or ad­justed before operating the mower. DO
NOT disconnect safety switches; they are
for the operator’s protection.

NOTE: Fo r starting in cold weather [below 40° F

(4° C)], use the optional cold start lever to release
the jackshaft drive belt and remove the hydrostatic
transmission from the starter cranking load. After
the engine has been started and warmed up, lower
the lever to re-engage the jackshaft drive belt.

WARNING

NEVER run the engine in an enclosed or

poorly ventilated area. Engine exhaust

contains carbon monoxide, an odorless

and deadly gas.

1. Before attempting to start the engine, make

sure the operator is in the seat, the Forward

Speed Control is in NEUTRAL-PARK position,

and the blade clutch and parking brake are

DISENGAGED.

NOTE: Release parking brake to prevent extra

load on the starter if the transmission neutral is

slightly out of adjustment.

Optional Cold Start Lever

2. For Model MT and MTL, move the choke lever to
the ON position and move the throttle 1 /4 to 1 /2
open (toward FAST). Turn the ignition switch to
the START position to start the engine. Release
the key to RUN position as soon as the engine
starts.

NOTE: For Model MT and MTL, the choke
may not be required if the engine is warm.

IMPORTANT: If the engine fails to start after
approximately 10 seconds of cranking, the en­gine should be checked before further cranking.
Turn the key to the OFF position and allow a
60 second cool-down period between starting
attempts. Failure to follow these guidelines can
damage the starter motor and shorten battery
life. Consult your Walker dealer or Authorized
Kohler dealer for additional help.

39

Operating Instructions

3. After the engine starts, make sure the oil pres­sure light goes off. If not, stop the engine imme­diately and find the cause of the problem. Make
sure the oil pressure light is off prior to engaging
the mower blades and beginning operation.

4. For Model MT and MTL, gradually move the
choke to the OFF position, keeping enough
choke on to allow the engine to run smoothly
as it warms up. As soon as possible, move the
choke to the OFF position.

IMPORTANT: For Model MT and MTL, make
sure the choke is in the OFF position during nor­mal engine operation; running with the choke in
the ON position CAN damage the engine.

ADJUSTING GROUND SPEED AND STEERING
IMPORTANT: If the DSD52 or DSD62 Mower deck

is installed on the tractor , m ake sure the dolly wheel
is retracted BEFORE moving.

CAUTION

Learn to START, STOP, and MANEUVER
the mower in a large, open area.

CAUTION

A safety interlock switch (seat switch) will
cause the engine to stop if the FSC is out
of the NEUTRAL-PARK position and the
operator is not in the seat. The function of
this switch should be checked by the op­erator raising off the seat with the tractor
moving forward (allow 1 to 1-1/2 seconds
off the seat for the time delay functio n);
the engine should stop. If the safe ty sys ­tem is not working, it should be repaired
or replaced before operating the mower.
DO NOT disconnect the safety switches;
they are for the operator's protection.

NOTE: If the FSC lever will not stay in the

selected position, the friction lock needs to be
adjusted. Contact your Walker dealer.

2. Steer by pulling the lever on the side of desired
direction of turn, e.g., pull the LH lever to turn
left. To minimize the possibility of overcontrol,
use only one hand on both steering levers.

If the operator has not operated a ma­chine with LEVER STEERING OR DUAL
HYDROSTATIC TRANSMISSIONS, steer­ing and ground operation should be
learned and practiced until the operator is
completely comfortable handling the ma­chine BEFORE ATTEMPTING TO MOW.

DANGER

Keep feet on footrests at all times when
the machine is moving. Never operate the
tractor without a deck or implement in­stalled.

1. Move the FSC out of NEUTRAL-PARK
position to the desired forward speed. DO
NOT hold forward on steering levers. It is not
necessary to hold the FSC lever in position
since a friction lock maintains the selected
lever position (and forward travel speed).

40

Operating Instructions

Beginning Recommendations are:
 Learn operation of the mower in an open

area away from buildings, fences, and ob­structions. Learn operation on flat ground
BEFORE operating on slopes.

 Start maneuvering th e mower with SLOW
engine speed and SLOW Forward Speed
Control setting until familiar with all operat­ing characteristics.

 Remember it is not necessary to hold the
steering levers forward (a unique Walker
feature); always PULL on the levers for
steering or for reverse motion of the mower.

 Learn to operate the mower with your left
hand on the steering levers and right hand
on Forward Speed Control. The use of two
hands on the steering levers tends to cause
overcontrol.

 Learn to operat e th e st ee rin g le ve rs wi th
smooth action. Jerky movements are hard
on the transmission and lawn. For sharp
turns, do not allow the inside wheel to stop
and twist on the grass. Pull the steering le­ver controlling the inside wheel into reverse
for a smooth “rolling” turn (one wheel roll­ing forward while the other rolls backward).

 Practice maneuvering the mower until
you can make it go exactly where you are
aiming.

 Remember, for an emergency stop, or in
case of loss of control, machine movement
can always be stopped quickly by pulling
the Forward Speed Control into the NEU­TRAL-PARK position.

Pull Steering Levers

With Left Hand

Forward Speed Control

(FSC)

Keep Feet On Footrest

When Moving

Correct Operator Hand Position

on the Controls

3. Reverse direction of the mower by pulling both
levers backward.

NOTE: Smooth action on the steering levers
will produce smooth mower operation. Remem­ber to keep the engine and ground speed slow
until learning the control response.

4. The FSC may be adjusted forward for faster
ground speed and backward for slower ground
speed. When mowing, ground speed should be
adjusted to match the load on the cutter blades,
i.e., as the engine pulls down in heavy cutting,
pull back on the FSC lever to reduce ground
speed. Adjusting ground speed helps maintain
a balance between engine power and blade
speed for high-quality cutting action.

5. Stop ground travel by pulling both steering le­vers backward to the NEUTRAL position (trac-
tor not moving) and then moving the FSC lever
to the NEUTRAL-PARK position.

NOTE: If the tractor creeps forward or back­ward with the FSC lever in the NEUTRAL-PARK
position, the transmission control needs to be
adjusted. Contact your Walker dealer.

41

Operating Instructions

Engaged

Position

Disengaged

Position

ENGAGING THE MOWER

1. Set the engine throttle at about 1/3 speed. Do

not attempt to engage the blade clutch at
high engine speeds. This will drastically short-

en drive belt life. Use only moderate engine
speed when engaging the blade clutch.

2. Pull the blade clutch lever SLOWLY up to en-
gage the mower blades.

CAUTION

A safety interlock switch (seat switch) will
cause the engine to stop if the blade
clutch is engaged and the operator is not
in the seat. The function of this switch
should be checked by the operator rais­ing off the seat and engaging the blade
clutch; the engine should stop. If the
switch is not working, it should be re­paired or replaced before operating the
mower. DO NOT disconnect the safety
switches; they are for the operator’s pro­tection.

Blade Clutch Engaged

IMPORTANT: DO NOT engage the blade clutch

when transporting the mower across drives, side­walks, loose materials, etc. DO NOT engage the

blade clutch with the PTO shaft disconnected

(the mower deck removed from tractor).

CAUTION

If the cutting blades strike a st ationary ob­ject while mowing, stop the mower imme­diately, disconnect the spark plug wires,
lift the deck, and inspect the deck and
blades thoroughly for damage. Make sure
that the blade timing has not been dis­turbed (the blades should be at 90 degrees
to each other). Refer to REPLACING/RE­PAIRING the Blade Overload Shear Bolts
in Maintenance Ins tructions if blades are out
of time. Also, make sure the blade retain­ing nuts are torqued to 60 f t-lb (8 1.3 N

·m).

Blade Clutch Disengaged

42

Operating Instructions

STOPPING THE MACHINE

1. Pull the steering levers to th e NEUTRAL posi­tion and then move the FSC lever backward to
the NEUTRAL-PARK position.

2. Slow the engine to a fast idle; put the throttle in
the 1/2 throttle position.

3. Disengage the blade clutch.
IMPORTANT: DO NOT disengage the blade

clutch with high engine speed (above 1/2 throt­tle) since the brake action on the blade drive will
cause premature wear of the brake band.

WARNING

A brake stops the cutter blades (and blow­er on GHS equipped models) from free­wheeling within five (5) seconds after
disengaging the clutch. If the brake sys­tem malfunctions and the blades do not
stop within five (5) seconds, the brake
should be adjusted or rep aired befo re op­erating the mower. Contact your Walker
dealer.

IMPORTANT: The hydrostatic transmissions

lock to prevent the mower from rolling freely with
the engine stopped. However, if the mower is
parked on a slope, it is necessary to ENGAGE
the parking BRAKE to prevent the mower from
creeping. This is due to a small amount of slip­page in the hydrostatic transmissions, especially
when transmission fluid is warm.

WARNING

In case either of the transmission drive
belts break during operation, and if the
machine is on a slope, the machine will
freewheel down the slope. To maintain
control, immediately (1) Release the
steering levers and simultaneously (2)
Move the FSC to the NEUTRAL-PARK
position. When the machine is stopped or
moving slowly , engage t he p arking brake .

NOTE: The emer gency stop procedure is ex-

actly the same procedure as used to normally
stop and park the machine.

4. Turn the ignition switch OFF. When stopping
the engine, do not reduce the throttle below 1/2
speed. Since the engine is equipped with a
shutdown solenoid, stopping at low idle may
cause engine run-on or backfiring.

WARNING

Remove the key from the ignition switch
when leaving the mower unattended. This
will prevent children and inexperienced
operators from starting the engine.

5. Engage the parking brake. Also, engaging the
parking brake is recommended when stopping
or parking the machine in a confined space with
little tolerance for movement.

43

Operating Instructions

Lift Handle

Deck Support

Pin

Hitch Pin

Cam in

LOCKOUT

Position

Plunger

Depressed

Lockout Lever

Cam in

UNLOCKED

Position

Lockout Lever

Plunger

Released

ADJUSTING CUTTING HEIGHT

WARNING

The engine must be stopped before ad­justing cutting height. Disengage the
blade clutch (PTO), stop the engine, and
remove the ignition key . Wait for all move­ment to stop before getting off the seat.

Cutting height is adjusted by positioning the four re­tainer hitch pins in a series of seven vertical holes
on the deck support pins. Lift handles have been
provided on each end of the deck to assist in raising
the deck while positioning the hitch pins. Cutting
heights range from 1 in. (25 mm) [top holes] to 4 in.
(102 mm) [bottom holes] in 1/2 in. (13 mm) incre­ments.

3. The mower will “freewheel” with the levers in the
LOCKOUT position. The levers must be in the
highest position to completely unlock the trans­missions.

Lockout Lever - Freewheel Position

4. After moving the mower, release the locking
cam, placing the lever DOWN in the normal OP-
ERATING position. Make sure the transmission
lockout plunger on the side of the transmission
case (activated by the lockout lever) is com-
pletely released, otherwise the transmission
operation will be erratic.

44

Cutting Height Adjustment

TRANSMISSION LOCKOUT
IMPORTANT: DO NOT TOW the tractor with the

transmission lockout engaged. Towing can produce
excessive internal pressure and damage the tra ns­mission.

To move the mower with the engine NOT running
(dead battery, maintenance, etc.), the hydrostatic
transmissions are unlocked (released).

1. Raise the front body.

2. Lift the transmission lockout lever on both the
RH and LH transmissions and secure into place
with the locking cam.

Lockout Lever - Normal Operating Position

Operating Instructions

RECOMMENDATIONS FOR MOWING

DANGER

Do not mow around overhanging tree
branches or bushes at the same height as
the operator’s torso and head where inad­vertent contact may cause injury.

 When mowing, operate the engine at or near full

throttle for the best cutting action and performance

of the grass handling system (GHS). Mowing with a
lower engine RPM causes the mowing blade to not
cut clean and tear the grass. The engine is

designed to be operated at full speed.

 When mowing in adverse conditions (tall and/or

wet grass), mow the grass twice. Raise the mower
to the highest setting - 4 in. (102 mm) - for the first
pass and then make a second pass cutting to the
desired height.

 Use a slow setting on the FSC for trimming

operations.

 Make sure the mower is leveled properly for a

smooth cut. Refer to Deck Leveling in Assembly
Instructions.

 Use an alternating stripe mowing pattern for

best appearance and vary the dire ction of the stripe

each time the grass is mowed to avoid wear patterns
in the grass.

 Avoid damage to the grass by slipping and skid-

ding of the drive tires. Use smooth control move­ments of the steering levers since the hydrostatic

transmissions are “power boosted controls” and
jerking the levers can easily slip the tires. For sharp
turns, do not allow the inside wheel to stop and twist
on grass; pull inside steering lever into reverse for a
smooth “rolling” turn (one wheel rolling forward while
the other rolls backward).

Avoid Low Hanging Branches

IMPORTANT: Operate the engine at full throttle

when mowing, to allow the engine to produce full
horsepower and to increase efficiency of the e ngine
cooling system.

 Keep the mower deck and discharge chute clean.
 Mow with sharp blades. A dull blade tears the

grass (resulting in poor lawn appearance) and uses
extra power (slowing the mowing speed).

 It is preferable to cut grass when it is dry and not

too tall. Mow frequently and do not cut grass too

short. (For best appearance, cut off 1/3 or less of
existing grass height.)

45

Operating Instructions

Discharge

Shield

Maximum Recommended

Side Slope - Do Not Operate

on Steep Slopes

5 FT

MINIMUM

 When using a side discharge mower deck, the

side discharge shield must not be removed and
must be kept in the lowest possible position to
deflect grass clippings and thrown objects down­ward. Orient the side discharge away from side­walks or streets to minimize cleanup of clippings.
When mowing close to obstacles, orient the side dis­charge away from obstacles to reduce the chance of
damage to property by thrown objects.

Side Discharge Shield in Lowest Position

 When ope rating on a slope, reduce sp eed and

use caution to start, stop, and maneuver. Avoid

sharp turns or sudden changes in direction. The

maximum recommended side slope operating
angle is 20 degrees or 33% grade.

Maximum Recommended Side Slope

DANGER

Do not mow or dump grass within 5 f eet
(1.5 meters) of an embankment or retain­ing wall with drop off.

46

No Driving Zone

Operating Instructions

RECOMMENDATIONS FOR TILT-UP DECK OPERATION/TRANSPORT

To avoid potential deck and/or tractor damage while
using the tilt-up deck, the following recommenda­tions are offered:

 Do not move the tractor with the deck in the tilt-

up position since both the roller wheels (on the back
of the deck) and the GHS discharge chute may be
damaged by moving the tractor. The tilt-up configu­ration should only be used when the tractor is
parked.

 The tractor body should never be tilted for-

ward with the deck in the tilt-up position. This can

cause the deck to unhook from the tractor and fall
with considerable force, potentially causing deck or
tractor damage and/or bodily injury.

 When tran sporting a tractor with the deck in the

tilt-up position (on a truck or trailer), the deck
should be secured to the vehicle with a strap or

rope (stop vertical movement). This will prevent the
deck from bouncing on the rear roller whee ls (caus­ing breakage). This will also prevent the deck from
unhooking from the tractor and falling, potentially
causing deck or tractor damage. Damage to other
items parked in front of the deck may also occur.

47

Operating Instructions

PTO and Blade

Gear Drive

PTO

Clutch

Rear Discharge

Mower Deck

Deck

Discharge Chute

Blower

Body Chute

Assembly

Exhaust Screen

(Removable)

Shear Pin

Shear

Bolt

Catcher

Door

Grass-Pak

®

Vane Switch

Powerfil

®

Delivery Spout

Powerfil

®

Drive Motor

Actuator

Rod

“Full” Signal

Horn

Grass Catcher

Catcher

Door Spring

Dump Handle

GRASS HANDLING SYSTEM (GHS)
GHS Model Only

48

GHS Flow and Components

Operating Instructions

Blower

Intake Cover

General Information

The Grass Handling System (GHS) consists of a
rear discharge mower deck connected to a 10.5 in.
(27 cm) blower and a rear mounted grass catcher
with 10.0 bushel (352 liters) capacity or op tiona l 7.0
bushel (246 liters) capacity. The GHS blower oper­ates any time the mower blade clutch is engaged
and moves grass through the rear discharge deck
chute into the grass catcher. Blower airflow is ex­hausted out the back of the grass catcher , through a
filtering screen. When the grass catcher is full and
needs to be emptied, a “full” signal horn alerts
the operator . When the “full” sign al horn so unds, it
is important to stop mowing to prevent overfilling
and clogging of the blower system.

IMPORTANT: Normally, the GHS blower operates
with no maintenance or cleaning required. However ,
under certain operating conditions, the inside of the
blower housing may accumulate a deposit of dirt,
causing wear and binding of the blower wheel.
Normally, dirt buildup occurs when mowing a com-
bination of dirty and damp grass, especially in
the springtime. When operating in these condi­tions, check the blower wheel frequently for
binding and clean the blower housing as required.
Refer to CLEANING the GHS Blower in Mainte-

nance Instructions.

NOTE: When a side discharge or mulching mow-

er deck is installed on the GHS model, a blower
intake cover should be installed in the blower int ake
tube. This cover “unloads” the blower and seals
the intake to effectively eliminate power loss and
blower noise when the blower is not being used.

Blower Intake Cover

NOTE: An alternative to using the blower intake

cover when a side discharge or mulching deck is
installed on a GHS model is the blower lockout kit
(P/N 7541). The blower lockout kit releases ten­sion on the blower drive belt and does not require
the blower intake cover.

NOTE: In Autumn, when using the GHS mower to
vacuum leaves, it is recommended to raise the front
of the mower deck 2 to 3 notches [1 to 1-1/ 2 in. (25
to 38 mm)] higher than the rear. This will avoid
“bulldozing” leaves, particularly when the leaves
are piled in a thick layer. To make this adjustment,
the hitch pins in the two (2) front deck support pins
are repositioned 2 to 3 notches higher while leaving
the rear pins in their original position.

DANGER

NEVER operate the GHS catcher with the
back door open. Objects may be thrown
out the back of the catcher with suff icient
force to cause serious injury to bystand­ers or property damage. NOTE: For non­catching operation, the "No-Catch" De­flector is an available accessory item.

DANGER

ROTATING BLOWER BLADES

NEVER operate the GHS blower with the
blower discharge chute uncovered (grass
catcher in the dump position) since dan­gerous projectiles may be thrown. NEVER
put hands into the blower discharge chute
for any reason. Use a stick or similar in­strument to remove any material if clog­ging has occurred.

CAUTION

NEVER leave grass clippings in the grass
catcher after mowing. Damp clippings
generate heat as they decompose. This
MAY cause spontaneous combustion.

49

Operating Instructions

FORWARD

Blades Must Operate at

Right Angles (90 Degrees)

Mounting Nut

Torque = 60 ft-lb

(81.3 N

·m)

Rear Discharge

Chute

Clogging Checklist In case of clogging, there will be a distinct change

in the sound of the blower, i.e., the blower sound

will stop. Also, the mower deck will begin to leave a
trail of grass clippings. When this occurs, stop t he
engine, disconnect the spark plug wires, and make

sure all movement has stopped before attempt­ing to unclog.

DANGER

NEVER place hands under the mower
deck or in the GHS blower discharge
chute. Use a stick or similar tool to re­move any clogged material.

Normally, any clogging will first develop at the back
of the mower deck in the discharge opening into the
blower chute. Clogging at this point does not indi-

cate a particular problem in this part of the
system, but is a symptom of something restrict­ing the flow of material throughout the entire

system. The following list of items should be
checked if a pattern of clogging begins to develop.
All of these items are capable of causing clogging at
the back of the deck.

 Check to see if the RH and LH mower blades are

installed for the correct rotation - install blades so
the cutting edges move toward each other.

 Check the amount of flat section remaining at

blade tip. This is the area that is ground away (re­moved) when the blades are sharpened. If too much
of the flat section is removed, the “air lift” perfor­mance or “shovel” effect of the blade deteriorates to
the point that discharge of gras s clippings into the
blower chute is marginal. Replace cutter blades if
less than 3/4 in. (19 mm) flat section remains at the
blade tip.

 Check that the interior of the deck housing and

baffling is reasonably clean and free of grass and
dirt buildup. While some degree of material

buildup can be tolerated, a point is finally reached
where the flow of air and grass clippings is
restricted.

NOTE: One condition that quickly causes a
buildup of material in the deck housing is mowing
grass and/or weeds which are “juicy.” The material
collects under the deck with sticky , green juice. Clo­ver and weeds are especially a problem. The mo w­er deck will need to be cleaned frequently when op­erating in these conditions.

 Check the deck cutting height setting. When

working in thick, tall grass, lower deck settings
[1 to 2 in. (25 to 51 mm) cutting heights] tend to
restrict airflow from moving into and under the

deck. Raising the deck cutting height will signifi­cantly increase airflow and reduce clogging when
working in thick, tall grass.

 Check the interior of the chute connecting the

mower deck to the blower for smoothness and
freedom from obstruction.

50

Blade Rotation for GHS Mower Deck

(View from Underneath)

 Check the blower wheel for bent blades and

excessive clearance between the blade tip and the

blower housing. A clearance greater than 1/8 in.
(3 mm) will cause a significant loss of blower
performance.

 Check the blower discharge chute into the grass

catcher for smoothness and freedom from ob­struction.

 Check the elbow inside the grass catcher for a

buildup of material in the radius of the elbow. In
certain conditions (damp/dirty grass) a considera­ble “clump” of material can accumulate at this point,
greatly restricting material and airflow.

Operating Instructions

Grass Catcher

Screen

Removal

Knobs

(Not Visible)

 Check that the openings in the removable air

exhaust screen in the grass catcher are not
plugged. If the screen is clogged, refer to Cleaning
the GHS Exhaust Screen in this section.

NOTE: An optional exhaust screen with larger

holes (3/4") is available for use when mowing in wet
grass; the screen provides less airflow restriction
and more clog resistance (use standard s creen in
dry conditions to avoid excessive material blowing
out of the catcher).

Remember , anything that restricts airflow or material
flow along the entire path from the mower deck to
the grass catcher can cause clogging.

Using the Tilt-Up Deck Refer to CLEANING of Grass Buildup in Mower

Housing in Maintenance Instructions. Using the GHS Catcher

Powerfil

The GHS catcher has an oscillating grass delivery
spout (POWERFIL
grass clippings throughout the interior of the grass
catcher (even when mowing wet, heavy grass). The
oscillating action may be checked by turning the
ignition switch to the ON position and moving the
blade clutch to the ENGAGED position. The spout
should oscillate approximately 25 cycles per
minute.

®

®

) which is designed to spread

WARNING

DO NOT test the Grass-Pak® switch with
the engine running. Projectiles may be
thrown out of the grass delivery spout,
and COULD cause serious injury.

The “full” signal horn is designed to operate (sound)
when the grass catcher is almost full. The timing of
the signal is adjustable by changing the position of
the vane on the Grass-Pak
coming on too soon (catcher not co mpletely full) or
too late (grass clogging in catcher spout and deliv­ery chute), refer to ADJUSTMENTS for GHS Signal

Horn Adjustment in Maintenance Instructions.
NOTE: The horn signal should be adjusted to

sound BEFORE the catcher is completely full to
give the operator time to react and stop mowing. An
indication the horn signal is coming on too late (de­layed too much) is if grass clippings are falling out of
the grass catcher delivery chute when the catcher is
dumped.

Cleaning the GHS Exhaust Screen

To remove the grass catcher screen for cleaning,
open the catcher door, push forward and pull down
on the grass catcher screen knobs (on either side of
the screen), and slide the screen out. Use a high
pressure washer or water spray and brush to clean
the screen.

®

switch. If the signal is

NOTE: If the grass spout fails to oscillate, the
clutch switch should be checked for function (the
switch closure is adjustable).

“Full” Signal Horn

The GHS catcher has a “full” signal horn to alert
the operator to dump the catcher when it is full (to
prevent overfilling and clogging). The “full” signal
horn is activated by a vane switch (Grass-Pak
switch) mounted on the grass delivery spout. Oscil­lating action of the spout triggers the vane switch as
grass begins to fill in around the spout when the
catcher is almost full.

The “full” signal function may be checked by turning
the ignition switch ON, engaging the blade clutch
(engine not running), opening the catcher back door ,
and triggering the Grass-Pak
oscillates. The horn should sound as the switch is
moved in both directions.

®

vane by hand as it

Keeping the catcher exhaust screen clean and open
is essential to good performance of the catching
system. In some mowing conditions, e.g., wet and
dirty, it will be necessary to clean the screen fre­quently to avoid clogging the mower deck, blower,
and chutes due to airflow restriction.

®

Grass Catcher Screen Removal for Cleaning

51

Operating Instructions

Tailgate

Door

Handle

Hook Bag

on Bumper

Dumping the Catcher

DANGER

Do not mow or dump grass within 5 feet
(1.5 meters) of an embankment or retain­ing wall with drop off.

For dumping, the catcher eithe r tailgate dum ps into
a disposal area or dumps into the optional dump
bag. The dump bag is a reusable nylon fabric bag
designe d t o conveniently move grass clippings from
the catcher to a remote disposal area or container.

CAUTION

Use leg muscles and firm footing when lif t­ing the catcher to dump; avoid bending at
the waist and using back muscles to av oid
back injury .

Tailgate Dumping

4. Close the door by holding the door handle.
The door will close smoothly with the assis­tance of the gas springs. If the dampening
springs are not functioning properly, they
should be replaced to prevent the door from
slamming closed and possibly causing a pinch
point. (When using the optional 7.0 bushel
catcher, close the door by holding the door
handle with the left hand and releasing the
safety latch on the door hinge mechanism
with the right hand. The safety latch is re­leased by pressing in on the top of the latch.)

Using the Dump Bag

1. Open the back door by lifting on the door handle.
NOTE: When using the optional 7.0 bushel

catcher, a safety latch locks the door open
in the fully opened position while the catcher
is being dumped to prevent accidental door
closure.

2. Orient the dump bag with one (or two) of the
handle straps on the bag opening facing up.

1. Open the back door by lifting on the door handle.
NOTE: When using the optional 7.0 bushel

catcher, a safety latch locks the door open
in the fully opened position while the catcher
is being dumped to prevent accidental door
closure.

2. Tilt the catcher back to dump by lifting on the
catcher lift handle on the lower front corner of
the catcher.

3. Lower the catcher smoothly down to the n ormal
operating position. DO NOT allow the catcher

to drop down - the gas spring, that holds th e
catcher in the raised position, is not a shock
absorber for lowering the catcher.

Positioning Dump Bag on Catcher

52

Operating Instructions

Catcher Lift/

Dump Handle

3. Hook the bottom of the bag over the rear
bumper while lifting on the handle strap(s).

4. Tilt the catcher back to dump into the bag by
lifting on the catcher lift handle on the lower
front corner of the catcher with the one hand
while continuing to hold up on the bag
strap(s) with the other hand. Refer to photos
for positioning the bag and dumping.

6. Close the door by holding the door handle.
The door will close smoothly with the assis­tance of the gas springs. If the dampening
springs are not functioning properly, they
should be replaced to prevent the door from
slamming closed and possibly causing a pinch
point. (When using the optional 7.0 bushel
catcher, close the door by holding the door
handle with the left hand and releasing the
safety latch on the door hinge mechanism
with the right hand. The safety latch is re­leased by pressing in on the top of the latch.)

Power Dump Option

When equipped with the optional power dump sys­tem, the operator dumps the catcher while sitting in
the seat. A toggle switch operating a power ram is
used to raise and lower the catcher. The back door
automatically opens and closes during the dump
cycle.

Hold the toggle switch UP or DOWN to RAISE or
LOWER the catcher. When the catcher reaches the
full raised or lowered position, the power ram clutch
will make a ratcheting sound. Release the toggle
switch as soon as this sound is heard. DO NOT op-

erate the ram with the clutch ratcheting for an
extended time as this will cause extra wear on the

clutch mechanism.

Dumping Catcher into Dump Bag

5. Lower the catcher smoothly down to the n ormal
operating position. DO NOT allow the catcher

to drop down - the gas spring, that holds th e
catcher in the raised position, is not a shock
absorber for lowering the catcher.

CAUTION

The operator should be in the seat and
bystanders stay clear when the power
dump is operating. The power dump is
used ONLY for tailgate dumping. Do not
attempt to use the optional dump bag or
any other bag with the power dump.

NOTE: If grass tends to hang up in the catcher af-

ter raising the catcher with the power dump, “jiggle”
the steering levers and make the tractor bounce a lit­tle to unstick the grass and make it slide out of the
catcher.

NOTE: With the power dump mechanism in the
normal operating position (catcher down), the
catcher can be manually raised for access to the
engine and the catcher can be manually dumped.

53

Operating Instructions

(-) Auxiliary

Power Terminal

(+) Auxiliary

Power Terminal

Toggle Switc h

(Dump)

Toggle Switch

(Lift)

Hi-Dump® Option

®

When equipped with the optional Hi-Dump

system,
the operator raises and dumps the catcher while sit­ting in the seat. Two toggle switches operate
independent hydraulic cylinders to raise and lower
the catcher. The back door automatically opens an d
closes during the dump cycle.

NOTE: The ignition switch must be in the ON posi­tion for the Hi-Dump

®

system to operate.

CAUTION

The operator should be in the seat with
the machine in the NEUTRAL-P ARK Posi­tion and the parking brake engaged and
bystanders st ay clear when the Hi-Dump
is operating. Do not attempt to use the
optional dump bag or any other bag with
the Hi-Dump

®

.

NOTE: If grass tends to hang up in the catcher af-

ter raising the catcher with the Hi-Dump
the steering levers and make the tractor bounce a lit­tle to unstick the grass and make it slide out of the
catcher.

®

NOTE: With the Hi-Dump

mechanism in the nor­mal operating position (catcher down), the catcher
cannot be manually raised. In the case of a dead
battery , use the auxiliary power terminals to charge/
jump the battery to operate the Hi-Dump

®

®

, “jiggle”

.

®

Hold the Lift toggle switch UP or DOWN to RAISE or
LOWER the catcher.

54

Lift/Dump Control Switches and

Auxiliary Power Terminals

Operating Instructions

Grass Catcher

Cable

Guide

Catcher

Door

Fork

Lift Channel

Gas

Spring

Rubber

Bumper

Power Dump

Ram Actuator

Dog Leg

Assembly

Actuator Mount

Assembly

Cable Assembly

Catcher Door

Gas Spring

Upper

Arm

Lower

Arm

Door Arm

Actuator

Power Dump Components

55

Operating Instructions

Grass Catcher

Cable
Guide

Cable Assembly

Lift Channel

Lift

Cylinder

Reservoir/Power

Unit

Dump Toggle

Switch

Lift Toggle

Switch

Control

Lift Rod

Control

Lift Rod

Safety

Lockout Arm

Gas Spring

Assembly

Catcher

Pivot Arm

Dump

Cylinder

Hydraulic

Valves

Coil with

Connectors

Hydraulic

Valve Box

Catcher Door

Gas Spring

Catcher Door

Lower

Arm

Door Arm

Actuator

Upper

Arm

Junction

56

Blocks

(not visible)

Hi-Dump® Components

Maintenance Instructions

CAUTION

Maintenance procedures requiring special training or
tools should be performed by a trained technician.

MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MT, MTL, MTEFI, MTLEFI

Service Item

Daily

25

Hours

100

Hours

200

Hours Yearly

Every

2Years

Ref.

Page

Check Engine Crankcase Oil Level x 59
Check/Clean Engine Air Cooling System* x 68
Check Coolant Level, Radiator/Overflow Tank (MTL) x 72
Clean Radiator Screen and Cooling Fins* (MTL) x 69
Check Security of Air Filtration Components x 72
Check Air Filter Restriction Gauge x 67
Clean Grass Buildup Under Deck x 70
Clean GHS Exhaust Screen* x 51
Clean GHS Blower* x 71
Service Mower Blades x 74
Check Functions of Instrument Panel and

Warning Horn

x27

Lubricate Grease Fittings and Oil Points* x 63
Check PTO Gearbox Oil Level** x 62
Check Battery Electrolyte Level x 73
Check Hydrostatic Transmission Fluid



x63
Check Tire Pressure x 74
Check Drive Belts (Jackshaft, Engine PTO,

GHS Blower, Ground Drive)

x75
Check Gearbox Oil Seals x 75

Check Safety Switch System x 76
Check Turbine Precleaner* x 66
Check Blade Brake Action x 76
Check Air Filter Element*** x 67
Check Oil Level in Gear Axle x 62
Clean Hydrostatic Transmission Cooling Fins x 71
Clean Engine Cooling Fins (MT, MTEFI) x 69
Change Engine Crankcase Oil (MT, MTEFI)
Check Wheel Bolt Torque (75 to 85 ft-lbs) x 74
Change Engine Oil Filter (MT, MTEFI)
Change Engine Crankcase Oil (MTL)
Change Engine Oil Filter (MTL)









x60

x60
x60

x60
Check Radiator Hoses and Clamps (MTL) x 76
Check/Regap Spark Plugs x 75
Replace Air Filter Element, Safety Filter,

Vacuator™ Valve***

x67

Replace Fuel Filter x82
Flush Radiator and Change Coolant (MTL) x 70
Service Battery x73
Check FSC Friction Lock x76
Service Solenoid Shift Starter x



Check PTO U-Joints for Wear/Looseness x 76
Check Fuel Lines and Clamps x 75
Change Gear Axle Oil
Change Hydrostatic Transmission Fluid







x62

x 
Replace Radiator Hoses and Clamps (MTL) x 76
Replace Fuel Lines and Clamps x75
Replace Ignition Wires x75

 More often in extremely dusty or dirty conditions (refer to notes about air cleaner element in

IMPORTANT TIPS FOR CARE OF KOHLER ENGINE)

 Change PTO gearbox oil after first 100 hours of operation (break-in period)

 Air cleaner is remote mounted Donaldson Radialseal™ unit, replace filter every year

 Change engine oil and filter after first 5 hours of operation of a new engine (break-in period)

 Change every 2 years or 1000 hours

 See your Walker dealer for this service or refer to the Walker Service Manual

 Hydrostatic transmissions are sealed - DO NOT OPEN RESERVOIR CAPS - refer to Hydrostatic

Transmission Fluid

57

Maintenance Instructions KOHLER TIPS

IMPORTANT TIPS FOR CARE OF THE KOHLER ENGINE

Fuel System

 Fuel must be clean - free from water, dirt, and or -

ganic material.

 Change fuel filter on a regular basis and when

contamination is suspected or found in the fuel.

 On the Model MTEFI, the fuel system is pressur-

ized. Do not attempt to service this fuel system. Con­tact your Wa lker dealer or authorized Kohler service
dealer for work on the fuel system.

Starting/Stopping

 For starting in cold weather [below 40° F (4° C)],

use the optional cold start lever to release the hydro­static transmissions from the starter cranking load.

 Start engine with the throttle advanced off idle

(1/4 to 1/2 throttle). This will aid starting, especially
in cold weather.

 Keep the battery fully charged.
 Match crankcase oil viscosity to the ambient tem-

perature, allowing the engine to crank faster and
start easier.

 Operate the engine at full speed when mowing.

This allows the engine to produce full horsepower
and move more cooling air through the engine cool­ing fins.

Cooling System - MTL

 Fill the cooling system with a pre-mixed solution

of 50/50 antifreeze (ethylene glycol) and distilled
water.

IMPORTANT: Solution must be pre-mixed before
putting it in the engine (adding pure antifreeze into
the radiator may cause damage to the engine by
causing overheating).

 Maintain proper fluid levels in the radiator and

overflow tank.

 Operate the engine at full speed when mowing.

This will allow the engine to produce full horsepower
and move more cooling air through the radiator.

Air Cleaner System

 Use only Donaldson air cleaner elements. After-

market elements may not seal in the air cleaner
housing, allowing dirt to enter the engine. Als o, af­termarket filters often skimp on the filtration me dia
and require more frequent replacement (see follow­ing instructions).

 Use fast idle for stopping engine to avoid run-on

or backfiring.

Cooling System - MT, MTEFI

 Keep engine air intake screen and cylinder head

fins free of grass clippings, chaff, and dirt. Inspect
intake screen and cooling fins for cleanliness and no
damage.

 Periodically remove two access panels in the en-

gine shroud to inspect and clean cylinder head cool­ing fins.

 Check performance of the cooling system by

starting the engine, holding a hand adjacent to the
cylinder head, and feeling the cooling airflow.

DANGER

Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.

 Use the air flow restriction gauge to indicate the

need to service the air filter.

 Do frequently check the Turbine Precleaner for

free movement of the internal fan.

 DO NOT overservice or frequently “disturb” the

air filter. A dirty air filter actually cleans better than
a new one. Changing the air filter too often can ac­tually reduce filter efficiency and increase the o ppor­tunity for traces of dust to en ter the engine. Wait
until the element really needs servicing as indicated
by the air flow restriction gauge.

 When the air filter element is removed or re-

placed, make sure all dust is cleaned out of the air
cleaner housing and hose. Use a damp clo th and

wipe the interior of the canister and hose clean (a lit­tle dirt left here will be sucked into the engine and
reduce engine life). When the filter is reinstalled,
make sure the element is held tight and st raight in
the canister for proper seating and sealing.

 Periodically check the air intake hose for cuts,

nicks, etc., and the hose clamps for tightness.

58

Maintenance Instructions KOHLER TIPS/LUBRICATION

Full Mark

Low Mark

Oil

 Use only multi-viscosity oils as specified with the

viscosity matching ambient temperatures for the en­gine operating conditions. This will aid starting in
cold weather and assure proper lubrication in hot
weather.

 Use only Kohler oil filters. Aftermarket filters

may not seal properly and/or have the incorrect

pressure relief valve for proper lubrication.

LUBRICATION

WARNING

DO NOT attempt to lubricate the machine
with the engine running. Disengage the
PTO clutch, shut off the machine, and re­move the ignition key.

Proper lubrication is an important maintenance pro­cedure. It reduces wear and makes the machine
quieter and easier to operate.

Engine Oil

Engine Break-In Oil

IMPORTANT: NEVER check or add oil with the
engine running.

2. Before removing the dipstick, clean the area
around the dipstick to keep any dirt or debris o ut
of the engine.

3. Remove the dipstick, wipe off with a clean rag,
then reinsert the dipstick into the tube and press
all the way down.

4. Remove the dipstick again and ch eck the oil lev­el on the dipstick. The oil level should be within
the “Operating Range” on the dipstick (between
the “L” mark and the “F” mark).

IMPORTANT: DO NOT operate engine without
a sufficient oil supply in the crankcase. DO NOT
operate with the oil level below the “L” mark or
above the “F” mark on the dipstick.

5. If additional oil is needed, refer to Specifications
for proper crankcase lubricant. Fill up to, but

not above, the “F” mark on the dipstick.
IMPORTANT: DO NOT overfill the crankcase

(oil above “F” mark) as th is CAN result in en­gine overheating, loss of power, and possible
engine damage.

No special break-in oil is required. The engine is
serviced with 10W-30, Service Class SG oil from the
factory . Change the oil after the initial engine break-

in period of 5 hours. Thereafter, change oil after
every 100 hours of operation (200 hour interval for

MTL).

Checking Engine Crankcase Oil Level

Check the engine crankcase oil level before use and

after each 8 hours of continuous operation.
IMPORTANT: The importance of checking and

maintaining the proper crankcase oil level cannot be
overemphasized. Check the oil level BEFORE

EACH USE.

1. Park the mower on a level surface with the en­gine stopped. Also, make sure the engine is

cool and oil has had time to drain into the sump
[allow at least five (5) minutes after stopping
the engine].

Dipstick Operating Range

59

Maintenance Instructions LUBRICATION

Oil Filter

Drain Plug

Changing Engine Crankcase Oil/Oil Filter

For Model MT and MTEFI, change the engine crank­case oil after every 100 hours of operation and re­place the oil filter every other oil change (every 200
hours of operation).

For Model MTL, change the engine crankcase oil af-
ter every 200 hours of operation and replace the oil
filter at the same time.

1. Park the mower on a level surface with the en-
gine stopped. The engine oil should be warm
before draining. If not warm from operation,
start the engine and run a few minutes to warm
the oil.

2. Remove the dipstick and the oil drain plug and
drain the oil into a suitable container . Be sure to
allow ample time for complete drainage.

6. Install the new oil filter on the engine. Turn the
filter clockwise until the rubber gasket contacts
the sealing surface, then tighten an additional

1/2 turn.

7. Reinstall the drain plug. Make sure it is tight­ened to 10 ft-lb (13.6 N

8. Fill the crankcase through the oil filler tube (dip­stick opening) with new, clean oil. Use only
crankcase lubricants recommended by the en­gine manufacturer. Refer to
this manual or the engine owner’s manual. Use
the recommended oil viscosity for the expected
ambient temperature. Oil with the correct vis­cosity will aid starting in cold weather and assure
proper lubrication in hot weather . Fill up to, but
not above, the “F” mark on the dipstick.
Crankcase capacity is 1.85 quarts (1.75 liters)
plus 1/2 pint (0.24 liters) for the new oil filter.

IMPORTANT: Check the dipstick reading be­fore adding the last 1/2 pint of oil and fill only to
the “F” mark. DO NOT overfill the crankcase
(oil above “F” mark) as th is CAN result in en­gine overheating, loss of power, and possible
engine damage.

·m).

Specifications in

Oil Drain/Oil Filter Location

3. Before removing the oil filter, clean the area
around the filter to keep dirt and debris out of
the engine.

4. Remove the old oil filter and wipe off the filter
mounting surface on the engine.

5. Apply a thin coating of clean oil to the rubber
gasket on the replacement oil filter.

IMPORTANT: Use ONLY oil filters from the en­gine manufacturer (Kohler 12-050-01). After­market oil filters may not seal properly and/or
may not have the correct pressure relief valve
for proper lubrication.

9. Start the engine and check for oil leaks around
the oil filter. Stop the engine, recheck the oil
level, and add oil if necessary. (When the en­gine is first operated with a new oil filter, the oil
level drops slightly as the filter is filled with oil.)

Mower Deck Gearbox Lubrication
NOTE: These instructions apply to all mower

decks with gear-driven blades. Refer to DSD52 or
DSD62 Mower Deck Lubrication in this section for

the DSD52 or DSD62 deck with belt-driven blades.
The mower deck gearboxes (tee gearbox and blade

drive gearboxes) are connected as a unitized assem­bly , and oil flows freely between them. The gearbox­es are permanently lubricated (oil filled) and sealed
requiring no scheduled lubrication. However, the
gearbox oil seals should be checked every 25 hours
for indication of an oil leak; particularly the lower
seals on the blade drive gearboxes should be in­spected, since they operate in a dirty environment. If
an oil leak is noted, replace the oil seal and relubri­cate the gearbox assembly as follows:

1. Remove gearbox cover (footrest). Deck orien­tation should be the normal operating position.

60

Maintenance Instructions LUBRICATION

Blade Drive

Gearboxes

Tee

Gearbox

Dolly Wheel

Pivot

U-Joint

Belt Drive

Gearbox

DSD52 or DSD62 Mower Deck Lubrication

There are several special lubrication requirements
for the DSD52 or DSD62 mower deck in addition to
the requirements detailed in the Chassis and Deck
Lubrication illustration. Lubricate the locations
shown in the Gearbox, Dolly Wheel, and U-Joint
Lubrication ph oto and check and maintain oil in the
belt drive gearbox.

1. Check the oil level in the belt drive gearbox ev-
ery 100 hours (or sooner if a visible oil leak has
developed). With the deck in the normal oper­ating position, remove the level plug in the side
of the gearcase. Add SAE E.P. (Extreme Pres­sure) 80W-90 (API GL-5) gear lube to maintain

Mower Deck Gearboxes

(Shown with Gearbox Cover

Removed for Clarity)

2. Clean the area around the individual gearbox
cover plates to prevent contaminants from en­tering the gearcase.

the oil level to the plug. If the oil level is low,
check the gearbox for any indication of an oil
leak. If an oil leak is noted, the gearbox will
need to be removed and rebuilt.

2. Lubricate the dolly wheel pivot every 25 hours
with general purpose grease.

3. Remove the screws securing the cover plates
on the blade drive gearboxes.

4. Check the level of lubricant in the gearboxes. If
the lubricant is low, add SAE E.P. (Extreme
Pressure) 80W-90 (API GL-5) gear lube until
the oil level is up to (submerges) the horizontal
shaft in the gearbox (shaft parallel to cover
plate).

NOTE: In case the gearboxes are completely
drained of oil, approximately 5 fl. oz. (15 cl) of oil
per gearbox is required to refill the gear drive
assembly.

NOTE: Since the gearboxes are connected as
a unit by connector tubes, it is necessary to add
oil slowly. Allow a few minutes after adding oil
for the oil to flow throughout the assembly and
the oil level to stabilize before reassembly.

IMPORTANT: DO NOT overfill the deck gear­boxes. The gearbox assembly is not vented,
and overfilling with oil will cause excessive pres­sure and result in oil leaks.

3. Lubricate the U-Joint in the drive shaft every
8 hours with SAE general purpose lithium or
molybdenum base grease.

Gearbox, Dolly Wheel, and U-Joint Lubrication

5. Check condition of the cover gasket and replace
if worn or damaged. Reinstall gearbox cover
plates; torque screws to 24 in-lb (2.7 N

·m).

61

Maintenance Instructions LUBRICATION

PTO

Gearbox

Vent Plug

Dipstick

Jackshaft

Tractor PTO Gearbox Lubrication

Checking Gearbox Oil Level

Check the gearbox oil level every 25 hours, and if
necessary, add oil [SAE E.P. (Extreme Pressure)
80W-90 (API GL-5) gear lube] to maintain oil level to
the FULL mark on the dipstick.

IMPORTANT: DO NOT overfill the PTO gearbox to
avoid oil leakage out of the dipstick standpipe.

If the oil level is low, check the gearbox for any indi­cation of an oil leak. If an oil leak is noted, the gear­box will need to be removed and rebuilt.

Changing Gearbox Oil

The tractor PTO gearbox is oil filled. No scheduled
oil change is required. However , changing the oil af-
ter the first 100 hour break-in period will extend
gearbox life and is recommended.

1. Remove the drain plug in the bottom of the
gearcase, drain the oil, and reinstall the plug.

2. Refill the gearbox through the dipstick stand­pipe using 7 to 8 fl. oz. (21 to 24 cl) of SAE E.P.
(Extreme Pressure) 80W-90 (API GL-5) gear
lube. Remove plug in top of gearcase to vent air
when refilling.

3. Check that the oil level is at the FULL mark on
the dipstick. DO NOT overfill.

Gear Axle Lubrication

 The gear axle oil lubrication is SAE E.P. 80W-90

(API GL-5) gear lube.

 Check the axle oil level after every 100 hours of

operation by removing the oil level plug. If additional
oil is needed, remove the breather vent on top of ax­le and fill until oil is at the level plug.

Dipstick Location, Tractor PTO Gearbox

 Change axle oil every 1000 hours or two (2)

years.

62

Maintenance Instructions LUBRICATION

Cold Level

Air Bleed Plug

Reservoir Cap

Hydrostatic Transmission Fluid

Checking Hydrostatic Transmission Fluid Level

The hydrostatic transmissions are sealed units
and do not need to be opened to check the fluid
level. Hydrostatic fluid level should be checked ev­ery 25 hours of machine operation. It is preferable

to check the fluid when the fluid is cold. Check
fluid levels as follows:

IMPORTANT: Removing or breaking the seal on
the hydrostatic reservoir cap within the first
1000 hours will VOID THE TRANSMISSION WAR­RANTY.

1. Park the mower on a level surface. St o p t h e
engine and wipe dirt and contaminants from
around the base of the reservoir to better see
the COLD mark.

2. The level of the oil can be seen through the side
of the opaque reservoir (DO NOT REMOVE
RESERVOIR CAP); using a light next to the
reservoir will help make the level more visible.

Grease Fitting and Oil Point Lubrication Lubricate the grease fittings and oil points after ev-

ery 25 hours of operation. Lubricate more often

when operating in dusty or dirty conditions. Use
SAE general purpose lithium or molybdenum base
grease for grease fittings and light machine oil (SAE

10) to lubricate oil points. Lubricate the locations

shown in the Chassis and Deck Lubrication
Points illustration.

NOTE: PTO universal joints (on the deck and trac-

tor) require routine lubrication after ever y 8 hours of
running time. Remove tractor PT O quick disconnect
tube assembly for easy access to grease fittings.

NOTE: The best way to lubricate the PTO tube half
of the universal joint assembly is to remove it from
the tractor. See instructions for removing and install­ing PTO quick coupler, refer to Deck Installation in

Mower Deck Installation on Tractor in the Assem-
bly Instructions.

Transm ission Reservoir and

Air Bleed Plug Location

3. The reservoir has a fluid level COLD mark. The
reservoir oil level should ALWAYS be at or

slightly above the COLD mark.

4. If the fluid is below the COLD mark (or the trans­mission is not performing properly , contact your

local dealer. Attempting to add fluid or ser­vice the transmission may VOID THE TRANS­MISSION WARRA NTY.

63

Maintenance Instructions LUBRICATION

Ident Lubrication No.
No. Location Type Places

1 Deck Caster Wheel Fork Pivot Grease 2
2 Deck Caster Wheel Bearing Grease 2

3 Tee Gearbox, Deck Oil
4 Blade Drive Gearbox Oil
5 Universal Joint Shaft Assembly Grease

6 Pivot Assembly, Tilt-Up Deck Grease 4
7 Deck Support Arm Socket Grease 2
8 Body Hinge Point Oil 2
9 FSC Actuator Rod Pivot Pins Oil 2
10 FSC Lever Pivot Grease 1
11 FSC Lever Fork Grease 1

(Grease Slide Area)
12 (FSC) Friction Body Pivot Grease 1
13 Steering Lever Pivot Grease 4
14 Deck Support Arm Pivot Grease 2
15 Deck-to-PTO Coupling Grease 1

(Grease Slide Area)
16 Universal Joint Tube Assembly Grease
17 Universal Joint Quick Connect Grease 1

Spline (Grease Slide Area)
18 Parking Brake Lever Grease 1

19 Gear Axle Oil
20 Belt Tightener Pivot, Grease 1

Jackshaft Drive
21 Throttle Control Cable Ends Oil 2
22 Clutch Actuator Push Rod Grease 2
23 PTO Clutch Lever Pivot Grease 1
24 Belt Tightener Pivot, Grease 1

PTO Clutch

* 1
* 2

** 1

** 1

*** 2

Ident Lubrication No.
No. Location Type Places

25 Brake Actuator Rod and Brake Oil 3

Band Pivot Pins (Clevis)
26 Brake Actuator Pivot Grease 1
27 Catcher Hinge Point Oil 2
28 Rear Wheel Bearings Grease 2

29 Engine Oil Oil
30 Choke Control Cable Ends Oil 2

(Models MT and MTL only)
31 Belt Tightener Pivot, Grease 1

Blower Drive (GHS Model Only)
32 Belt Tightener Pivot, Grease 1

Ground Drive
33 PTO Gearbox Dipstick Oil
34 Hydrostatic Drive Oil
35 Choke Control Pivot Oil 1

(Models MT and MTL only)
36 Throttle Control Pivot Oil 1

*** 1

*** 1
*** 2

* Gearboxes are permanently lubricated and

sealed requiring no scheduled lubrication.
Oil level should be checked only when an oil
leak is noted. Refer to Mower Deck Gear-

box Lubrication in this section.

** Grease every eight (8) hours.
*** Refer to Gear Axle Lubrication, Engine

Oil, Tracto r PTO Gearbox Lubricat ion, and
Hydrostatic T ransmission Fluid in this sec-

tion.

64

NOTE: DGHS42 Tilt-Up Deck is shown for reference.

For other Deck Lubrication Points, Refer to
Deck and Carrier Frame Illustrated Parts

Manual.

Maintenance Instructions LUBRICATION

11

2

2

3

4

6
7

6

8

13
14

19
34

30 & 35

34

33
32
31

4

5

6
7

6
8

9

12

13
14
15

16
1721 & 36

18
19

20

10

11

30
29

27 27

28

21

23

26

22

22

25

24

Chassis and Deck Lubrication Points

65

Maintenance Instructions CLEANING

Turbine

Precleaner

Precleaner

Tube

Hose

Clamp

Engine

Donaldson Air

Cleaner Cover

Vacuator™

Valve

Air Intake

Hose

Safety

Filter

Donaldson Air

Cleaner

Air Restriction

Gauge

Air Cleaner

Cartridge

CLEANING
Engine Air Cleaner System

There are two main components in the engine air
cleaner system: a turbine precleaner and a Donald­son Radialseal™ air cleaner. Each component is
checked, cleaned and maintained on a different
schedule based on the filtering action required.
Each component is serviced as follows:

Turbine Precleaner

The turbine precleaner is mounted on a remote air
intake tube connected to the Donaldson air cleaner.
A spinning fan driven by the intake airflow separates
dust from the air, giving the initial st age of air clean­ing. Dust particles are exhausted through a single
small vent in the side of the housing. Since no dust
is trapped, the precleaner operates without clean­ing. The only maintenance required is to check the
operation of the internal fan every 100 hour s. Verify
operation:

1. Look into the exhaust vent while shining a light
into the intake.

2. Star t the engine and watch the fan begin to spi n
as the throttle is advanced.

If the fan is not spinning, service or replace the pre­cleaner as required.

Engine Air Cleaner System Components

66

Maintenance Instructions CLEANING

Canister

Cover

Vacuator™

Valve

Cover Latch

Radialseal™

Filter Element

Air Restriction

Gauge

Push Button to Reset

Indicator After Service

Donaldson Radialseal™ Air Cleaner

A remote mounted Donaldson Radialseal™ air
cleaner provides the air filtering function. The paper
filter element slides over an outlet tube inside the air
cleaner canister with radial sealing action, reducing
the possibility of dust leaks due to improper filter
installation. Intake design, internal baffling, and a
V a cuator ™ valve provide dust separation and auto­matic precleaning action. Daily or frequent servic­ing of the air cleaner is not required. Use the air
restriction gauge on the air cleaner outlet to indicate
when the air filter needs servicing -- a red flag will
appear when the filter is overly restricting airflow into
the engine.

IMPORTANT: Use only Donaldson air filter ele­ments for replacement (Donaldson P822686 or
Walker 5090-1). Aftermarket filters may not seal
properly or filter efficiently.

Inspect the paper element after every 100 hours of
service and replace the element and safety filter
yearly (or when dirty or damaged). More frequent
replacement may be required when operating in ex­tremely dusty conditions as indicated by the air re­striction gauge. Service the air cleaner as follows:

Air Restriction Gauge Location

Air Cleaner Components

(Shown with Cover Being Removed)

IMPORTANT: The Donaldson air cleaner uses a dry

paper-type air filter element. NEVER apply oil to the
paper element.

1. Release the top and bottom cover latches and
remove the air cleaner cover. Wash the cover
and Vacuator™ valve. Check that these com­ponents are in good condition. The Vacuator™
valve is subject to wear and deterioration and
should be replaced yearly or when damaged.
The lips of the valve should close and fit togeth­er; any cracks, deformation, or wear in the valve
is cause for replacement.

2. Remove the filter element by pulling it out of the
canister. There will be some initial resistance as
the filter seal breaks loose and slides off of the
outlet tube. Gently move the end of the filter up
and down and side to side or twist to loosen the
seal. Use gentle action to minimize the amount
of dust dislodged as the filter is removed.

3. Replace the filter element.
NOTE: Washing the element in water or clean-

ing solution is not recommended. Do not try to
clean the element with compressed air.

67

Maintenance Instructions CLEANING

Radialseal™

Filter Element

Outlet Tube

Radial Sealing

Surface

Canister

Safety Filter

Orient to Top

of Canister

Cover Latch

Cover Latch

Vacuator™

Valve

4. Use a bright light inside the element to inspect
for damage. Check the element very carefully
for pin holes or other damage that will allow
dirt to leak through the paper media. Replace
element if necessary.

5. Without removing, visually inspect the condition
of the safety filter for damage or holes. The
safety filter should only be removed for yearly
replacement (or when dirty or damaged).

6. Check the condition and resilience of the radial
sealing surface (inside of the open end) of the
filter. Replace the filter if any cracks, tears, or
other damage to the sealing surface are noted.

7. Use a clean, damp cloth and wipe the interior of
the air cleaner canister clean. Use special care
to clean both the inside and outside surfaces
of the outlet tube.

IMPORTANT: Any dust left on the inside of the
outlet tube will go into the engine and cause wear.

8. Check the outside surface of the outlet tube for
smoothness and cleanness (this is the sealing
surface).

9. Insert and seat the safety filter and Radialseal™
element carefully into the canister, applying
pressure at the outer rim of the filter; not at the
flexible center. Make sure the filter element is
completely in place before installing the cover.

10. Install the cover with the word “TOP” properly
oriented to the top of the canister . Give the cov­er a slight twist as it reaches the canister to
make sure the tab inside the cover goes into a
slot, otherwise the cover will not fit properly.
Make sure both the top and bottom cover latch­es are securing the cover in place.

Proper Orientation of Air Cleaner Cover

1 1. Check the air intake hose for cuts, nicks, cracks,

etc., and the hose clamps for tightness.

12. Reset the air restriction indicator (press button
on the end of indicator).

Engine Cooling System - MT and MTEFI

Air Intake System

68

IMPORTANT: DO NOT use the cover latches
to force the filter into the canister -- the cover
should fit on with no extra force.

NOTE: DO NOT use petroleum based lubri­cants on the sealing surfaces of the filter; use tal­cum powder or dry silicone lubricants if required
for filter installation.

Air Filter Element Replacement

To prevent engine overheating and possible engine
damage, clean grass clippings, chaff, and dirt from
the rotating engine air intake screen after every 8
hours of operation. In certain mowing conditions
(dry grass, leaves, tree “cotton”, etc.), it may be nec­essary to check and clean the screen several times
each day to prevent engine overheating.

CAUTION

Operating the engine with a blocked air
intake screen, dirty or plugged cooling
fins, and/or cooling shrouds removed will
cause engine damage from overheating.

Maintenance Instructions CLEANING

Kohler Engine

Shroud

Engine Cooling

Fin Access Panels

Engine Air

Intake Screen

Check Airflow

with Hand

Cylinder

Head

Cylinder Head Cooling Fins

It is essential for performance and longevity of the
air-cooled engine to keep the cylinder head cooling
fins clean and free of obstruction. After every 8
hours of operation, check the performance of the
cooling system by starting the engine, holding a
hand adjacent to the cylinder head, and feeling the
cooling airflow . If there is little or no airflow , clean the
cooling fins as described below.

DANGER

Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.

Every 100 hours, inspect and clean the cooling fins

(more often when operating in extremely dusty, dirty
conditions). Remove the two ( 2) co oling fin acces s
panels in the engine shroud and clean the cooling
fins and external surfaces using compressed air.
Make sure to reinstall the access panels before op­erating the engine.

NOTE: If dirt is packed into the cooling fins it may
be necessary to remove the engine shroud in order
to thoroughly clean the cooling fins.

Cooling System Airflow

Engine Cooling System - MTL and MTLEFI

Radiator Screen and Cooling Fins

To prevent the engine from overheating and possi­ble engine damage, clean grass clippings, chaff,
and dirt from the fine mesh radiato r intake screen
daily. In certain mowing conditions (dry grass,
leaves, tree “cotton”, etc.), it m ay be necessary to
check and clean the screen several times during use
to prevent engine overheating.

1. Remove the screen. T o clean the screen, wa sh
with soapy water or blow out with compressed
air.

2. Inspect the radiator cooling fins for material
lodged in this area which would restrict cooling
airflow. Use pressurized air or water to clean.

DO NOT use any tool, like a screwdriver or
knife, to clean material out of the fins as this

may damage the cooling fins. DO NOT use cold
water on a hot radiator.

Engine Air Intake Screen

and Cooling Fin Access Panels

NOTE: Directing pressurized air or water from

the fan side of the radiator outward is recom­mended to dislodge material p acked on the out­side of the cooling fins. DO NOT use cold water
on a hot radiator .

WARNING

Radiator and engine parts can become ex­tremely hot during operation. W ear gloves
and avoid touching hot parts while clean­ing the radiator screen and cleaning de­bris away from the engine and cooling
system.

69

Maintenance Instructions CLEANING

Tilt-Up Latch

Deck Lock Lever

Flushing Radiator and Changing Coolant

Change engine coolant every year. Drain the cool-
ant from the engine and radiator:

1. Remove the radiator cap.

2. Open the drain cocks on the engine block and
radiator (see the Kohler Owner's Manual for lo­cation of the drain cocks). Also, drain the cool­ant recovery tank.

3. If there is any indication of deposits or scaling
inside the radiator, use a commercial scale re­mover and flush the cooling system thor­oughly before adding fresh coolant.

Use a pre-mixed 50/50 solution of antifreeze (ethyl­ene glycol) and distilled water to refill the cooling
system.

Tilt-Up Latch

Tilt-Up Hook

on Deck

Deck Secured in TILT-UP Position

DANGER

IMPORTANT: Th e solution of antifreez e and wa ter
must be thoroughly pre-mixed before putting it in the
engine. Adding pure antifreeze into the radiator may
cause damage to the engine from overheating.

IMPORTANT: Maintain proper coolant level in the
radiator and coolant recovery tank. The coolant lev­el should be maintained between FULL and LOW
marks on the coolant recovery tank. Recheck the
coolant level after the first time the engine has been
operated after filling the coolant system (it would be
normal to add a little coolant after initial operation).

Grass Buildup in Mower Housing

DANGER

Before raising or removing the mower
deck for cleaning, stop the engine, re­move the ignition key, and disconnect the
spark plug wires.

1. Raise the deck lock lever handle on each side
of the carrier frame and pull out to release car­rier frame for tilting action.

2. Using the carrier frame lift handle, raise deck to
the TILT-UP position and insert the deck hook
into the tilt-up latch on the tractor body.

Do not operate the mower with deck in tilt­up position. Do not move the tractor with
the deck in the tilt-up position.

3. Clean grass buildup underneath the deck using
a pressure washer (and scraper if required).

NOTE: While some degree of material buildup
in the mower deck housing can be tolerated, a
point is finally reached where cutting quality

deteriorates and clogging begins to occur

because of too much buildup on the b affling and
housing.

4. Lower the deck to the normal operating position
and re-engage the deck lock levers.

CAUTION

Do not operate machine with deck tilt- up
pivot joint unlocked.

70

Maintenance Instructions CLEANING

Blower

Pulley

Blower

Drive Pulley

Depress Idler Pulley

Down to Relax Belt

Belt Tightener

Idler Pulley

GHS Blower

Drive Belt

GHS Blower

Normally, the GHS blower operates with no mainte­nance or cleaning. However, when mowing grass
that is dirty and damp (especially springtime mow­ing), a deposit of dirt may accumulate inside the
blower housing, causing wear and binding of the
blower wheel. When operating in these conditions,

inspect the blower frequently for dirt buildup.
NOTE: A visual clue of binding of the blower wheel

is the blower blade tips are polished from rubbing
on dirt.

When a dirt deposit is found, use a high pressure
washer or water spray to clean the inside of the
housing as follows:

DANGER

Collapse Blower Belt Tightener

Before attempting to wash the blower,
stop the engine, remove the ignition key,
and disconnect the spark plug wires.
Wear goggles or face shield.

1. Remove the GHS blower drive be lt tension by
depressing the idler pulley on the tightener a rm.
Roll the belt off the blower pulley. The belt
should be clear of the blower pulley, allowing

free movement of the blower wheel.
IMPORTANT: With the belt removed, the blow-

er wheel must spin freely . Any binding or drag­ging of the wheel is an indication of dirt
buildup. This buildup must be cleaned to
avoid abrasive wear of the blower blades, ex­cessive power loss and eventual loss of blower
performance (clogging).

GHS Exhaust Screen

Refer to Cleaning the GHS Exhaust Screen in Op­erating Instructions.

Hydrostatic Transmission Cooling Fins

Keeping the cooling fins on the hydrostatic transmis­sions clean and free of obstruction is essential to
avoid overheating the transmission fluid and short­ening transmission life. T he cooling fins should be
checked every 100 hours; and cleaned if necessary .

To clean the fins, use compressed air and/or a pres­sure washer. The cooling fins extend all the way
around the housing -- the fins underneath need to be
clean as well as the more visible fins above. Also,
pay close attention to the area under the drive pulley .

to Remove GHS Blower Drive Belt

2. Use a pressure washer or water spray, and di-

3. Reinstall the GHS blower drive belt by reversing

rect the spray inside the blower housing ag ainst
the blower blades. Water pressure will cause
the blower wheel to begin to spin and the com­bination of spinning action and water will effec­tively wash the inside of the housing. Spray
may be directed against the blower blades ver­tically and horizontally to cause rotation in both
directions for thorough washing action. Wash
blower until the blower wheel spins freely in
both directions.

the removal procedure.

IMPORTANT: In case an oil leak develops on the
input shaft, the cooling fan blowing dusty air and oil
on the transmission will quickly pack the cooling
fins with oily dirt. If this condition occurs, replace
the seal immediately to avoid overheating and dam­aging the transmission. The input shaft assembly
and seal are easily replaced without removing the
transmission from the machine.

71

Maintenance Instructions

Cooling Fan

Cooling Fins

Recovery Tank

An additional procedure in maintaining transmission
cooling is to inspect the cooling fans. Replace the
fan(s) if blades are missing or damaged.

Hydrostatic Transmission Cooling Fins

CHECKING/SERVICING

CLEANING/

CHECKING/SERVICING

Model MTL Overflow Tank

Check the coolant level in the coolant recovery tank
and maintain the coolant level betwe en the FULL
and LOW marks on the recovery tank. When the
engine is cold, the coolant level should be at or
slightly above the LOW mark on the recovery tank.

Engine Cooling System - MTL and MTLEFI

Coolant Level

DANGER

To prevent accidental starting of the en­gine when servicing or adjusting the ma­chine, remove the key from the ignition
switch and disconnect the spark plug
wires.

WARNING

NEVER remove the radiator pressure cap
when the engine is hot — hot water could
spray and cause a burn if the cap is taken
off too soon.

If the coolant level is low, remove the radiator cap
and fill to the overflow port level and then fill the re­covery tank above the LOW mark. Use a pre-mixed
50/50 solution of antifreeze (ethylene glycol) and
distilled water to fill the cooling system.

IMPORTANT: The coolant solution of antifreeze
and distilled water must be thoroughly pre-mixed be­fore putting it in the engine (adding pure antifreeze
into the radiator may cause damage to the engine by
causing overheating).

Security of Air Filtration Components
NOTE: The following inspection is only an exter-

nal inspection and should be done without “dis­turbing” the filtration components.

On a daily basis, visually inspect the external condi­tion of the complete air cleaner system. The follow­ing items should be inspected:

1. Check the Donaldson Radialseal™ air cleaner
canister for damage. Make sure the cover is in
place and the cover latches are secure - do not
run the engine without the air cleaner cover in
place and secure.

72

2. Inspect both air intake hoses for cracks, nicks,
cuts, etc., and check the hose clamps for tight­ness.

3. Check to make sure the air flow indicator is in
place and tight.

Maintenance Instructions CHECKING/SERVICING

Battery
NOTE: For initial battery service during setup, re-

fer to Battery Service in Assembly Instructions.
IMPORTANT: Make sure battery is securely mount-

ed in the frame. A loose battery may cause damage
to the case resulting in acid leakage and sever e dam­age to the machine. A hazard may be created by
damage to critical working parts an d safety systems.

CAUTION

Important Battery Service, Inst all ation, and
Changing Tips for MTEFI/MTLEFI:

 Do not allow the battery cables to touch

opposing terminals. When connecting
battery cables attach the positive (+) cable
to positive (+) battery terminal first, followed
by negative (-) cable to negative (-) battery
terminal.

 Never start the engine when the cables

are loose or poorly connected to the
battery terminals.

 Never disconnect battery while engine is

running.

IMPORT ANT: DO NOT overfill the battery. Electro-

lyte will overflow through the vented caps onto part s
of the machine and WILL result in severe corrosion.

Cleaning the Terminals

If battery terminals are corroded, remove battery
from the mower. Using a wire brush, remove corro­sion with a solution of one part baking soda and
four part s water. Rinse with clean water. Coat the
terminals with petroleum jelly or terminal protector
spray to retard further corrosion.

Charging the Battery

Check the battery charge by measuring the specific
gravity of electrolyte; if specific gravity is less than

1.225, the battery will need to be charged as follows:

IMPORTANT: On MTEFI and MTLEFI models, al­ways disconnect the negative (-) battery terminal be­fore charging. Failure to do so can re sult in damage
to the ECU.

1. Charge the battery at 15 amps for 10 minutes.
DO NOT exceed 20 amps maximum recom­mended charging rate. Charge until specific
gravity is at least 1.250. Total charging time
should not exceed one (1) hour.

 Never use a quick battery charger to

start the engine.

 Never "jump start" the engine using

another source. Electricity fluctuations can
damage the ECU (Electronic Control Unit).

 Always disconnect negative (-) battery

cable lead before charging battery, and
also unplug harness from ECU before per­forming any welding on equipment.

Electrolyte Level

The battery electrolyte level should be checked af­ter every 25 hours of operation. To check electro-

lyte level:

1. Remove battery cell filler caps.

2. Check the electrolyte level. If the level is below
the bottom of the vent well, fill with drinking wa­ter to the bottom of the vent wells [1/4 to 1/2 in.
(6 to 13 mm) above the plates].

3. Replace filler caps.

2. After charging the battery, use distilled water to
adjust the electrolyte level to the bottom of the
vent wells [1/4 to 1/2 in. (6 to 13 mm) above the
plates].

DANGER

BATTERIES PRODUCE EXPLOSIVE
GASES

 Charge the battery in a well-ventilated

area, so that gases produced while charg­ing can dissipate.

 Keep sparks, flames, and smoking ma-

terials away from the battery at all times.

 Make sure the battery cap vent s are open

(check manifold vent on each cap).

 Make sure the battery charger is un-

plugged before connecting or discon­necting cables to the battery.

73

Maintenance Instructions CHECKING/SERVICING

30°

Do Not Grind or

Sharpen on Underside

Sharpen at

Original 30° Angle

Intersection

Wear Area

Wing

Tip

Tire Pressure

WARNING

Inflate tires to pressures shown below:
Deck Caster Wheel = 20 PSI (137 kPa)

Drive = 15 PSI (103 kPa)
Rear = 20 PSI (137 kPa)

Wheel Bolt Torque
Every 100 hours check the eight (8) lug bolts that

mount the drive tires. They shou ld be to rq ue d to 75
to 85 ft-lbs (101.7 to 115.2 N

Sharpen Mower Blades Check mower blade(s) for straightness, sharp-

ness, condition of the cutting edge, and balance
every 10 hours of operation (or more often when

mowing abrasive type grass or operating on sandy
soils). Replace blades if worn, bent, cracked, or

otherwise damaged (refer to REPLACING/RE­PAIRING the Mower Blades in this section). Use the

following procedure to check and sharpen blades:

·m).

DO NOT try to straighten a blade that is
bent. NEVER weld a broken or cracked
blade. ALWAYS replace with a new blade
to assure safety.

4. If the blade cutting edge is dull or nicked, it
should be sharpened. Remove blades for
sharpening by grasping the end of the blad e us­ing a rag or a thick, padded glove, while loosen­ing and removing the nut, lock washer, and flat
washer that mounts the blade.

5. Grind cutting edge at the same bevel as the
original. Sharpen only the top of the cutting
edge to maintain sharpness.

NOTE: Blades can be sharpened with an elec­tric blade sharpener , conventional electric grind­er, or a hand file.

NOTE: Keep blades sharp - cutting with dull
blades not only yields a poor mowing job but slows
the cutting speed of the mower and causes extra
wear on the engine and blade drive by pulling hard.

1. Stop the engine, remove ignition key, and dis­connect the spark plug wires before raising the
mower deck to service blades.

2. Raise the deck and secure it in the TILT-UP po-
sition. Refer to CLEANING the Grass Buildup
in Mower Housing in this section for deck rais­ing instructions.

NEVER operate cutter blades with the
deck in the raised position.

NOTE: PTO shaft must be disconnected be-

fore checking blades for straightness.

3. Check the blades for straightness by marking
the blade tip position inside the deck housing,
and then rotating the opposite end of the blade
to the same position and comparing. If the dif­ference in blade tip track is more than 1/8 in.

(3 mm), the blade is bent and should be re­placed.

CAUTION

ALWAYS wear eye protection and glo ves
when sharpening a blade.

DANGER

Mower Blade Profile for Sharpening

74

Maintenance Instructions CHECKING/SERVICING

Blade Balancer

6. Check blade balance by positioning the blade
horizontally on a blade balancer or use a nail
or shaft through the center hole. If either end of
the blade rotates downward, grind (remove)
metal on that end until the blade will
balance. The blade is properly balanced when
neither end drops. Balance of a blade is gener­ally maintained by removing an equal amount of
material from each end of the blade when
sharpening.

Blade Balanced on Magnetic

Wall-Mounted Balancer

7. Mount the blade with wing tips pointing up into
the housing. Reinstall the blade, washer, lock
washer, and nut. Tighten the nut to 60 ft-lb

(81.3 N
NOTE: When reinstalling blades on GHS

models, remember, the blades turn toward
each other (counter-rotate) an d the RH and LH

blade cannot be switched. Check for proper
blade rotation before installing blades on the
deck. Refer to Blade Rotation for GHS Mower
Deck illustration shown in Clogging Checklist
in Operating Instructions for correct blade
rotation.

·m).

Mower Deck Gearbox Oil Seals

The mower deck gearbox seals should be inspect­ed every 25 hours for evidence of oil leaking; par-

ticularly the lower oil seal on the blade drive
gearbox. This seal is protected by the trash guard

on the blade hub and seal protector plate on the
housing, but is still vulnerable to seal damage due
to operating in an adverse environment. The mow­er blade must be removed for inspection of the
seal, so it is recommended to inspect the gearbox

seals when blades are removed for sharpening.

If an oil leak is noted, the seal should be replaced
and the gearbox assembly relubricated. Refer to

LUBRICATION for Mower Deck Gearbox Lubri­cation in this section.

Spark Plugs
Every 200 hours of operation, remove the spark

plugs, inspect, clean, and reset the gap (or replace
with new plugs). Before removing the spark plugs,
clean the area around the base of the plugs to kee p
dirt and debris out of the engine. Clean spark plugs
with a wire brush. DO NOT use an abrasive grit
type cleaner. If the electrodes are burned short or
pitted, replace plugs with Champion
[MT & MTEFI (or equivalent)] or RC14YC [MTL &
MTLEFI (or equivalent)]. Check spark plug gap with
a wire-type feeler gauge and set the gap at 0.030 in.
(0.76 mm). Reinstall and tighten to between 18 and
22 ft-lb (24.4 to 29.8 N

Ignition Wires Good preventive maintenance calls for complete re-

placement of spark plug wires every two (2) years.
Fuel Lines and Clamps
NOTE: The MTEFI system is pressurized and

should be serviced by a Walker dealer or Authorized
Kohler engine service outlet.

·m).



type RC12YC

Drive Belts

Raise the body and inspect the condition of the
four (4) belts (3 belts on SD models) eve ry 25 hours
of operation - engine PTO drive , jackshaf t drive, hy­drostatic ground drive, and GHS blower drive. If the
belts show signs of cracking or deteriorating, th e
belts should be replaced. Refer to REPLACING/

REPAIRING the Drive Belts in this section.

Every year, inspect the fuel supply line from the tank

to engine for deterioration or damage. Also, inspect
the fuel line clamps for tightness. Good preventive
maintenance calls for complete replacement of fuel
lines and clamps every two (2) years.

75

Maintenance Instructions CHECKING/SERVICING

Radiator Hoses and Clamps - MTL and MTLEFI

Inspect the radiator hoses every 200 hours for de­terioration or damage. Also check the tightness of
the hose clamps. Good preventive maintenance
calls for complete replacement of the radiator hos­es and clamps every two (2) years.

Blade Brake Action

WARNING

It is important to check and maint ain blade
brake action for safe operation of the ma­chine.

Check the function of the cutter blade brake (and
blower brake on GHS models) by engaging the blade
clutch (PTO), operating the engin e at full throttle, then
disengaging the clutch and measur ing how quickly
the blades stop. Watch the rotation of the bla de drive
shaft and blower pulley as a visual indication that
movement has stopped. If the brake is working

properly , all rotation will stop five ( 5) seconds af­ter disengagement of the clutch. If the brake sys-

tem malfunctions - blades do not stop in five (5)
seconds - adjust or repair the brake before operating
the mower. Contact your Walker dealer for this ser­vice or refer to the Walker Service Manual.

PTO U-Joints

NOTE: There is a 1 to 1-1/2 second time delay

function on the seat switch to avoid engine power in­terruption when driving over bumps.

If any of the following conditions occur during start­ing or operating, a safety interlock switch may be
malfunctioning. Contact your Walker deal er for trou­bleshooting and/or replacement.

 With an operator in the seat, the engine starts

with the Forward Speed Control (FSC) and/or the
PTO engaged.

 With an operator in the seat, the engine starts but

dies soon after the Forward Speed Control (FSC) or
PTO is engaged.

 Without an operator on the seat, the engine

starts and continues to run with the Forward Speed
Control (FSC) and/or PTO engaged.

 With an operator in the seat, the Forward Speed

Control (FSC) and PTO disenga ged and p anel hor n
works, but the starter is not engaging.

Forward Speed Control Friction Lock The FSC friction lock is designed to hold the select-

ed forward travel speed when the steering levers

are moved and yet the friction is not too heavy to
make moving the FSC control difficult (too much
friction). The procedure for checking the FSC fric­tion lock is as follows:

76

The PTO U-joints should be inspected yearly for
looseness and wear . If either is noticed, the respec­tive shaft or tube should be replaced. A worn U-joint
can cause vibration and extensive damage to the
PTO and deck gearboxes.

Safety Switch System

WARNING

It is important to check and maintain the
safety switch system for safe operation of
the machine.

There are three (3) safety interlock switches on the
tractor; Seat Switch, FSC Neutral - Park Switch, and
PTO Switch.

1. Place the FSC in the full FORWARD position
and pull both steering levers back; the FSC le­ver should not move. If the FSC lever moves
back when the steering levers are pulled back,
the friction needs to be increased.

2. With the steering levers held back, move the
FSC lever back from the FORWARD position.
With a proper amount of friction adjusted, the
FSC lever should move back with a slight
amount of resistance (friction). If the FSC lever
movement is “stiff”, the friction needs to be de-

creased.

If the FSC friction lock needs to be adjusted, contact
your Walker dealer or refer to the Walker Service
Manual.

Maintenance Instructions REPLACING/REPAIRING

Jackshaft
Drive Belt

Engine PTO

Belt

GHS Blower Belt

(GHS Model Only)

Hydrostatic Ground

Drive Belt

REPLACING/REPAIRING

DANGER

To prevent accidental starting of the en­gine when replacing part s or rep airing the
machine, remove the key from the ignition
switch and disconnect the spark plug
wires.

IMPORTANT: ALWAYS use genuine factory re-

placement parts. Substitute parts CAN result in
product malfunction and possible injury to the oper­ator and/or others.

Drive Belts

There are four (4) individual belts on GHS models
or three (3) belts on SD models:

 Jackshaft Drive Belt
 Engine PTO Drive Belt (3 Groove Power Band)
 GHS Blower Drive Belt (GHS Model Only)
 Hydrostatic Ground Drive Belt

The belts may be removed and replaced using the

procedures described on the following pages.

Belt Locations

77

Maintenance Instructions REPLACING/REPAIRING

Pull UP to Engage

Engine

PTO Belt

Clutch

Linkage

PTO Belt

Tightener Arm

Engine

Pulley

Clutch Idler

Pulley

Belt

Guide

Belt Guides

(Bottom Guide Not Visible)

Blade Clutch Lever

in the DOWN Position

Belt

Guide

PTO Belt Tightener

Stop Block

Micro-V Pulley

(GHS Blower Drive)

PTO Drive

Pulley

Brake Band

Mount Bracket

Engine PTO Drive Belt (3 Groove Power Band)

1. To remove the engine PTO drive belt:
a. Remove the jackshaft drive belt from its

idler pulley (by pushing down on idler pul­ley) and let the belt drop down out of the
way.

NOTE: Step (a) is not essential to removing
the PTO belt, but it makes more room to work
with the PTO belt.

b. Push the clutch idler pulley down (until the

PTO belt tightener stop block contacts the
frame) and then shift the belt off the idler
pulley (to the inside).

c. Ra ise the c lutch leve r (eng age positio n) to

lift the clutch idler away from the belt.

d. Next remove the belt from the engine pul-

ley and then the PTO drive pulley.

2. Install the PTO drive belt by reversing the re­moval procedure.

IMPORTANT: Make sure the belt is installed
inside the four (4) belt guide pins.

Check and make the following adjustments:
a. Clutch engagement for proper belt tension.
b. Clutch disengagement and brake action.

78

Engine PTO Drive Belt Removal

Maintenance Instructions REPLACING/REPAIRING

Idler Pulley

Tension Spring

Jackshaft

Drive Belt

Push Idler Pulley Down to Relax Belt

Jackshaft

Engine

Pulley

Idler Arm

Jackshaft

Drive Belt

Jackshaft

Tension Spring

Engine

Pulley

Jackshaft Drive Belt

1. To remove the jackshaft drive belt:
a. Remove the engine PTO drive belt, as

described in previous section.

b. Relax the belt by depressing the spring-

loaded idler arm.

c. Roll the belt off the jackshaft pulley and

remove.

Jackshaft Drive Belt (Disengaged)

2. Reverse the removal procedure to replace the
jackshaft drive belt.

Jackshaft Drive Belt (Engaged)

79

Maintenance Instructions REPLACING/REPAIRING

Blower Drive

Pulley

Depress Idler Pulley

Down to Relax Belt

Belt Tightener

Idler Pulley

(Disengaged)

Blower

Pulley

GHS Blower

Drive Belt

Belt Tightener

Idler Pulley

(Engaged)

GHS Blower Drive Belt

1. Remove the GHS blower drive be lt tension by
depressing the idler pulley on the tightener
arm. Roll the belt off the blower pulley and
remove.

GHS Blower Drive Belt Assembly (Disengaged)

2. Reverse the procedure to install the GHS blow­er drive belt.

80

GHS Blower Drive Belt Assembly (Engaged)

Maintenance Instructions REPLACING/REPAIRING

Hydrostatic

Ground Drive Belt

Idler Pulley

Belt Tightener Arm

Jackshaft

Transmission

Drive Pulley

Spring

Belt Tightener Arm

Idler Pulley

Hydrostatic

Ground Drive Belt

Spring

Hydrostatic Ground Drive Belt

1. To remove the hydrostatic ground drive belt:
a. Raise the spring-loaded belt tightener arm

and idler pulley to relax belt.

b. Slide belt off pulleys, then release the idler.

Hydrostatic Ground Drive Belt Assembly (Disengaged)

2. Reverse the procedure to install the hydrostatic
ground drive belt.

Hydrostatic Ground Drive Belt Assembly (Engaged)

81

Maintenance Instructions REPLACING/REPAIRING

In-Line

Fuel Filter

Fuel Filter - Model MT and MTL

Models MT and MTL are each eq uipp ed wit h an in­line fuel filter. Visually inspect the filter periodica lly,
and replace the filter yearly.

Fuel Filter Location

IMPORTANT: Replace the fuel filter only in a clean

area where the fuel line and connections will not be
contaminated by any dust and dirt.

Fuel Filter - MTEFI and MTLEFI

WARNING

The MTEFI fuel system operates under
high pressure. This system should be
serviced by a Wa lker de aler or author ized
Kohler service dealer.

Model MTEFI is equipped with a high-volume, high­pressure, 10-15 micron, in-line fuel filter. Replace­ment of this filter is recommended every 1500
hours of operation or more frequently under ex­tremely dusty or dirty conditions. Because the
MTEFI has a pressurized fuel system, fuel filter re­placement should be done by a W alker dealer or au­thorized Kohler service dealer.

DANGER

Gasoline is extremely flammable and can
be highly explosive. To minimize danger:

 Use only an approved fuel container for

gasoline.

 DO NOT allow open flames or sparks

near the machine while performing main­tenance or refueling; DO NOT smoke
while working with fuel.

 Wipe up spilled gasoline immediately

and completely.

1. Expand and slide clamps on either side of the
filter away from filter and pull fuel lines off filter.

2. Replace filter.

82

Maintenance Instructions REPLACING/REPAIRING

Cutting Blade

Shear Bolts

Cotter Pin

U-Joint

Tube Assembly

Shear Pin

Split Spring Pin

(Retains U-Joint Held on Shaft

with Broken Shear Pin)

U-Joint

Shaft Assembly

Blade Overload Shear Bolts
NOTE: Shear bolts are not used on the DSD52 or

DSD62 mower deck.
The cutting blade is keyed to the blade hub by two

(2) shear bolts (10-24 x 5/8 in. stainless steel ma­chine screws). These bolts are designed to shear
and protect the blade drive gearbox from damage if
the blade encounters a shock load.

PTO Shear Pin

The PTO drive shaf t connection to the deck gearb ox
has a shear pin to provide shock load protection to
the mower deck drive. This system provides prima-
ry shock protection in case of blade impact and will
normally shear before the individual shear bolts on
the blade hub.

When the PTO pin has sheared, use the following
procedure to replace it:

1. Loosen the two bolts securing the PTO shaft
guard on the deck; lift the guard off. (Holes in
guard are slotted for easy removal.)

2. Rotate U-joint on shaft to align the shear pin
hole with the hole (and shear pin fragment) in
the shaft. Use a punch to drive the remaining
portion of the old shear pin out.

3. Install new shear pin and secure with cotter pin.

Cutting Blade Shear Bolts

NOTE: Tightening the 5/8-18 blade mounting nut
to 60 ft-lb (81.3 N
shock load protection. It is important to not over­tighten the mounting nut since this defeats (over-

rides) the function of the shear bolts.
If these bolts shear , remove the blade and install new

bolts. Refer to CHECKING/SERVICING in this sec­tion for Sharpen Mower Blades which describes the
blade removal and installation procedure.

After reinstalling the blade, check blade timing by
moving blades through one (1) complete revolu-
tion. Make sure blade tips pass clear of each other.
If timing is incorrect, contact your Walker dealer .

·m) is also important for proper

PTO Shear Pin

IMPORTANT: Use only Walker P/N 8067-13

shear pins for replacement to provide proper
shock protection -- these pins are har dened to
shear under a specific amount of load.

4. Reinstall the PTO shaft guard.
NOTE: Use Walker P/N 8067-10 for heavy duty

gearboxes.

Before operating the deck, inspect the blade over­load shear bolts and also check blade timing (on
gear driven decks) by moving blades through one
(1) complete revolution. Make sure blade tips
pass clear of each other. If timing is incorrect, con­tact your Walker dealer.

83

Maintenance Instructions REPLACING/REPAIRING

Mower Blades

Mower blades are removed and remounted as de­scribed in Sharpen Mower Blades instructions.
During the course of sharpening and inspecting
mower blades, if there are any of the following

conditions of wear or damage , blades should be
replaced for reasons of safety and performance of

the machine:

 An excessive amount of the flat sectio n of the

blade has been ground away (removed) when the
blade is sharpened. Replace the blade when less
than a 3/4 in. (19 mm) flat section remains at the
blade tip.

 Examine ends of the blade carefully, especially

the intersection where the flat section of the blade
turns up to form the “wing tip” (refer to Mower Blade

Profile for Sharpening illustration in Sharpen
Mower Blades instructions). Since sand and abra-

sive material can wear metal away in this area, the
blade should be replaced when metal thickness

has worn to 1/16 in. (1.6 mm) or less.

DANGER

When blades are operated over sandy
soil, and if blades are allowed to wear, a
“slot” may be worn into the wing tip of
blade. Eventually a piece of the blade may
break off creating a serious potential for
injury or damage.

 Check the blades for straightness by marking

blade tip position inside the deck housing and then
rotating the opposite end of the blade to the same
position and comparing. If the difference in blad e tip
track is more than 1/8 in. (3 mm), the blade is bent
and should be replaced.

 Inspect the blade surface, especially in formed

areas, for cracks. Replace the blade if any cracks
are found.

WARNING

DO NOT try to straighten a blade that is
bent. NEVER weld a broken or cracked
blade. ALWAYS replace with a new blade
to assure safety.

Reinstall the blades following procedure in

CHECKING/SERVICING for Sharpen Mower
Blades instructions. If blades are replaced, always

use Walker original equipment blades to ensure
safety and optimum performance. The qualit y and
performance of replacement blades offered by

other manufacturers cannot be guaranteed, they
could be dangerous.

CAUTION

ALW A YS use genuine factory replacement
parts. Substitute parts CAN result in prod­uct malfunction and possible injury to the
operator.

84

Maintenance Instructions ADJUSTMENTS

Adjustment

Slide

Locknut

(Pivot Point)

Locknut

(Position)

Set Screw

Jam Nut

ADJUSTMENTS
Steering Levers

An adjustment range of approximately 3 in. (76 mm)
is available on the steering levers - the levers can be
adjusted forward or aft depending on the arm length
of the operator . The levers can be adjusted by loos ­ening the locknut at the pivot point and the locknut
holding the lever in position in the adjustment slide.
Adjust levers into most comfortable position and
tighten both locknuts.

Tilt-Up Deck Adjustable Stop

When the carrier frame hinge joint is properly adjust­ed, the deck lock levers should move in and out of the
engaged and disengaged positions freely. Adjust­ments are made by loosening the jam nut and tight­ening or loosening the set screws on the Deck Mount
Pivot Brackets. Retighten the jam nut when the ad­justment is complete.

Tilt-Up Deck Adjustable Stop

Steering Lever Adjustment

85

Maintenance Instructions ADJUSTMENTS

Exhaust

Screen

Bend
Point

4 to 4-1/2 in.

(10.16 to 11.43 cm)

GHS Signal Horn Adjustment (When Horn Sounds at Wrong Time)

®

The vertical position of the Grass-Pak
ical to make sure the catcher box does not overfill
causing the delivery chute to clog . The vertical p o­sition can be adjusted by bending the mounting
bracket for the Grass-Pak

®

switch.

1. Position the discharge chute so that it is point­ing straight back.

a. Turn the ignition switch ON and move the

blade clutch to the ENGAGED position
(engine not running).

b. Open the catcher back door and monitor

the spout position (as it oscillates) and
move the blade clutch to the DISEN-
GAGED position and turn the ignition
switch to the OFF position.

WARNING

DO NOT test the Grass-Pak® switch with
the engine running. Projectiles CAN be
thrown out of the grass delivery spout and
CAN cause serious injury to bysta nders or
property damage.

2. Measure from the exhaust screen (top of catch­er) to the top of the Grass-Pak
vane, refer to Adjusting the Grass-Pak
Switch illustration. The proper measurement
should be between 4 and 4-1/2 in ches (10.16
and 11.43 cm).

switch is crit-

®

switch actuator

®

Adjusting the Grass-Pak

Switch

(Side View of Catcher Box)

3. If adjustment is required, hold the Grass-Pak

®

switch mount bracket firmly, grasp the switch
and bracket and bend it down. Adjustments
should be done in very small increment s check­ing the measurement each time until the recom­mended measurement is achieved. This
measurement is applicable to all catcher box
sizes.

NOTE: It will not be possible to adjust the

®

switch to give a signal at the precise instant the
catcher is full for a wide variety of mowing con­ditions. For example, wet heavy grass will fill the
catcher differently than dry fluffy grass, causing
the signal to come on a little sooner or later than
usual. Primarily, the switch should be adjusted
to give the “full” signal with a little advance
warning before overfilling and clogging of
the grass delivery chute begins (regardless of
mowing conditions).

86

LIMITED WARRANTY

FOR

WALKER

COMMERCIAL RIDER MOWER

1. WHAT THIS WARRANTY COVERS, AND FOR HOW LONG:

Walker Manufacturing company will, at its option, repair or replace, without charge, any part covered by this warranty
which is found to be defective in material and/or workmanship within one (1) year* after date of sale to the original retail
purchaser unless the product is used for rental purposes, in which case this warranty is limited to ninety (90) days. At
Walker's request, customer will make the defective part available for inspection by Walker and/or return the defective part
to Walker, transportation charges prepaid. All parts and components of the Walker Mower are covered by this warranty
except the following components which are warranted separately by their respective manufacturers:

Kohler Engine
Kubota Engine
Kawasaki Engine
Eaton Hydraulic Transmission
Peerless Gearboxes
Battery
Tires

The available warranties covering these items are furnished with each mower. Walker does not assume any warranty obli­gation, liability or modification for these items, which are covered exclusively by the stated warranty of the respective man­ufacturers noted above.

* An extended three (3) year warranty is offered on the Walker P/N 6200-9 Gear Axle Assembly.

2. WHAT THIS WARRANTY DOES NOT COVER:

A. This warranty does not cover defects caused by depreciation or damage caused by normal wear, accidents, improper

maintenance, improper use or abuse of the product, alterations, or failure to follow the instructions contained in the
Owner’s Manual for operation and maintenance.

B. The customer shall pay any charges for making service calls and/or for transporting the mower to and from the place

where the inspection and/or warranty work is performed.

3. HOW TO OBTAIN SERVICE UNDER THIS WARRANTY:

Warranty service can be arranged by contacting the dealer where you purchased the mower or by contacting Walker Man­ufacturing Company, 5925 East Harmony Road, Ft. Collins, CO 80528. Proof of the date of purchase may be required to
verify warranty coverage.

4. WARRANTY LIMITATION:

A. THERE IS NO OTHER EXPRESS WARRANTY. ANY WARRANTY THAT MAY BE IMPLIED FROM THIS

PURCHASE INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS HEREBY
LIMITED TO THE DURATION OF THIS WARRANTY AND TO THE EXTENT PERMITTED BY LAW ANY AND ALL
IMPLIED WARRANTIES ARE EXCLUDED. Some states do not allow limitations on how long an implied warranty

lasts, so the above limitations may not apply to you.

B. W ALKER WILL NOT BE LIABLE FOR ANY INCIDENTAL, CONSEQUENTIAL, OR SPECIAL DAMAGES AND/OR

EXPENSES IN CONNECTION WITH THE PURCHASE OR USE OF THE MOWER. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation(s) or exclusion(s) may not
apply to you.

C. Only the warranty expressed in this limited war ranty shall apply and no dealer, distributor, or individual is authorized

to amend, modify, or extend this warranty in any way. Accordingly, additional statements such as dealer advertising
or presentations, whether oral or written, do not constitute warranties by Walker, and should not be relied upon.

D. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

87

Sound - Model MT

Sound - Model MTEFI

Lwa

100

LpA

85

OPERATOR

Lwa

101

LpA

90

OPERATOR

Sound Test

Sound test conducted was in accordance
with Council Directive 2000/14/EEC and
was performed on 28 February 06 under the
conditions listed:

General Condition: Clear
Temperature: 18
Wind Speed: < 2 m/s
Humidity: 20%
Barometric Pressure: 83.8 kPA

o

(C), (65 F)

Sound - Model MTL

Sound Test

Sound test conducted was in accordance
with 79/113/EEC and was performed on 26
June 02 under the conditions listed:

General Condition: Clear
Temperature: 50 (F)
Wind Speed: < 5 mph (< 8 kmh)
Humidity: 52%
Ba ro me tr ic Pre ss ur e: 24 .9 " HG (7 59 mm Hg )

o

10 (C)o

Lwa

100

LpA

85

OPERATOR

Lwa

100

LpA

85

OPERATOR

Sound Test

Sound test conducted was in accordance
with Council Directive 2000/14/EEC and
was performed on 28 February 06 under the
conditions listed:

General Condition: Clear
Temperature: 18
Wind Speed: < 2 m/s
Humidity: 20%
Barometric Pressure: 83.8 kPA

o

(C), (65 F)

Sound - Model MTLEFI

Sound Test

Sound test conducted was in accordance
with Council Directive 2000/14/EEC and
was performed on 28 February 06 under the
conditions listed:

General Condition: Clear
Temperature: 18
Wind Speed: < 2 m/s
Humidity: 20%
Barometric Pressure: 83.8 kPA

o

(C), (65 F)

Vibration - Model MTEFI

Vibration Level

Vibration levels at the operators handles
were measured in the vertical, lateral, and

0.8g

longitudinal directions using calibrated vibra­tion test equipment.

Vibration - Model MTLEFI

Vibration Level

Vibration levels at the operators handles
were measured in the vertical, lateral, and

0.4g

longitudinal directions using calibrated vibra­tion test equipment.

0.8g

0.8g

Vibration - Model MT

Vibration Level

Vibration levels at the operators handles
were measured in the vertical, lateral, and
longitudinal directions using calibrated vibra­tion test equipment.

Vibration - Model MTL

Vibration Level

Vibration levels at the operators handles
were measured in the vertical, lateral, and
longitudinal directions using calibrated vibra­tion test equipment.

WA LKER MFG. CO.  5925 E. HARMONY ROAD, FORT COLLINS, CO 80528  [phone]

FORM NO. 080909 PRINTED IN USA www.walkermowers.com ©2009 WALKER MFG. CO

TM