Walker MDD User Manual

OWNER’S MANUAL

Safety, Assembly, Operating, and Maintenance Instructions

Model MDD (20.9 HP Diesel)

™

Please Read and Save These Instructions Effective Date: 02-15-05

For Safety, Read All Safety and Operation P/N 7000-8
Instructions Prior to Operating Machine

Foreword

Thank you. . .for purchasing a Walker mower. Every effort has been made to provide you with the
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. . .rea d this manual thoroughl y! This manual is to be used in conjuncti on 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 information 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 call our service department, at [phone],
for clarification before operating or servicing this mower.

This manual covers Model MDD with the Kubota D722 20.9 HP diesel 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 in format ion available at the time this m anu al wa s pro­duced.

Walker Mfg. Co. is continually s tr iv ing to improve the desi gn and per for ma nc e of its products. We
reserve the righ t to m ake c hanges i n sp ecifi catio ns and de sign wi thout th ereby incu rring 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 ___________________ 3
TRANSMISSION_________________________ 3
BLADE DRIVE __________________________ 4
TIRE SIZE______________________________ 4
TIRE PRESSURE ________________________ 4
DIMENSIONS (Tractor and Mower) _________ 5
MOWER DECK__________________________ 5
CURB WEIGHT (Approximate) _____________ 5
DRIVE BELTS___________________________ 6
GHS SYSTEM (Optional)__________________ 6
SEAT__________________________________ 6
FRAME/BODY CONSTRUCTION ___________ 6

Component Identification___________ 7 Safety Instructions _________________ 11

BEFORE OPERATING___________________ 11
OPERATING___________________________ 12
MAINTENANCE ________________________ 14
SAFETY, CONTROL, AND
INSTRUCTION DECALS _________________ 15

Assembly Instructions _____________ 17

SETUP INSTRUCTIONS _________________ 17

Tire Installation (Tractor)_______________ 17
Battery Service_______________________ 17

Wet Battery Service __________________ 17
Dry Battery Service __________________ 17
Battery Charging ____________________ 18
Battery Installation ___________________ 18

Mower Deck Assembly ________________ 18

Deck Caster Wheels Installation ________ 18
Deck Discharge Chute Installation ______ 19
Deck Discharge Shield Installation ______ 19
PTO Shaft Guard Installation __________ 19
Tilt-Up Roller Wheel Installation ________ 19

Mower Deck Installation on Tractor ______ 20

Deck Installation ____________________ 20
Deck Leveling ______________________ 22

PREOPERATING CHECKLIST ____________ 23

Operating Instructions_____________ 25

CONTROL IDENTIFICATION,
LOCATION, AND FUNCTION _____________ 25

Operating Controls ___________________ 25
Engine Throttle ______________________ 25
Forward Speed Control (FSC) __________ 26
Steering Levers ______________________ 26
Blade Clutch (PTO) ___________________ 26
Parking Brake _______________________ 26
Front Body Latch Release _____________ 26
Transmission Lockout Levers __________ 27

Cold Start Lever
(Jackshaft Drive Belt Release) _________ 27

Instrument Panel _____________________ 29
Voltmeter ___________________________ 30
Water Temperature Gauge _____________ 30
Oil Pressure Warning Light ____________ 30
Water Temperature Warning Light_______ 30
Ignition Switch_______________________ 30
Light Switch (For Optional Lights)_______ 31
Hourmeter __________________________ 31
Circuit Breakers______________________ 31
Warning Horn________________________ 31

STARTING THE ENGINE_________________ 31
ADJUSTING GROUND
SPEED AND STEERING _________________ 33
ENGAGING THE MOWER________________ 34
STOPPING THE MACHINE _______________ 35
ADJUSTING CUTTING HEIGHT ___________ 35
TRANSMISSION LOCKOUT ______________ 36
RECOMMENDATIONS FOR MOWING ______ 37
RECOMMENDATIONS FOR TILT-UP DECK
OPERATION/TRANSPORT_______________ 38
GRASS HANDLING SYSTEM (GHS) _______ 39

General Information __________________ 40
Clogging Checklist ___________________ 41
Using the Tilt-Up Deck ________________ 42
Using the GHS Catcher________________ 42

Powerfil
“Full” Signal Horn ___________________ 42

Cleaning the GHS Exhaust Screen ______ 42
Dumping the Catcher _________________ 43

Tailgate Dumping ___________________ 43
Using the Dump Bag _________________ 43
Power Dump Option _________________ 44

®

_________________________ 42

Table of Contents

Maintenance Instructions__________ 46

MAINTENANCE SCHEDULE CHART _______ 46
IMPORTANT TIPS FOR CARE
OF THE KUBOTA ENGINE _______________ 47

Fuel System _________________________ 47
Starting/Stopping_____________________ 47
Cooling System ______________________ 47
Air Cleaner System ___________________ 47
Oil _________________________________ 47

LUBRICATION _________________________ 48

Engine Oil ___________________________ 48

Engine Break-In Oil __________________ 48
Checking Engine Crankcase Oil Level ___ 48
Changing Engine Crankcase Oil/Oil Filter _48

Grease Fitting and Oil Point Lubrication__ 49
Mower Deck Gearbox Lubrication _______ 52
DSD52 or DSD62
Mower Deck Lubrication _______________ 52
Tractor PTO Gearbox Lubrication _______ 53

Checking Gearbox Oil Level ___________ 53
Changing Gearbox Oil ________________ 53

Gear Axle Lubrication _________________ 53
Hydrostatic Transmission Fluid_________ 54

Checking Hydrostatic
Transmission Fluid Level ______________ 54

CLEANING ____________________________ 55

Engine Air Cleaner System_____________ 55

Turbine Precleaner __________________ 55
Donaldson Radialseal™ Air Cleaner _____ 56

Engine Cooling System________________ 57

Radiator Screen and Cooling Fins ______ 57
Flushing Radiator and Changing Coolant _58

Grass Buildup in Mower Housing________ 58
GHS Blower _________________________ 59
GHS Exhaust Screen__________________ 59
Hydrostatic Transmission Cooling Fins __ 59

CHECKING/SERVICING _________________ 60

Engine Cooling System________________ 60

Coolant Level ______________________ 60
Fan Belt Tension ____________________ 60

Security of Air Filtration Components____ 61
Battery______________________________ 61

Electrolyte Level ____________________ 61
Cleaning the Terminals _______________ 61
Chargin g the Battery _________________ 61

Tire Pressure ________________________ 61
Sharpen Mower Blades ________________ 62
Drive Belts __________________________ 63
Mower Deck Gearbox Oil Seals _________ 63
Fuel Lines and Clamps ________________ 63
Radiator Hoses and Clamps ____________ 63
Blade Brake Action ___________________ 63

REPLACING/REPAIRING ________________ 64

Drive Belts __________________________ 64

Engine PTO Drive Belt _______________ 65
Jackshaft Drive Belt _________________ 66
GHS Blower Drive Belt _______________ 67
Hydrostatic Ground Drive Belt _________ 68
Engine Fan Belt ____________________ 69

Fuel Filter ___________________________ 70
Blade Overload Shear Bolts ____________ 70
PTO Shear Pin _______________________ 71
Mower Blades _______________________ 71

ADJUSTMENTS________________________ 72

Steering Levers ______________________ 72
Tilt-Up Deck Adjustable Stop ___________ 72
GHS Signal Horn Adjustment
(When Horn Sounds at Wrong Time)_____ 72

Maintenance And Service Record Sheet

_______________________ 74

Warranty___________________________ 75

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 disregardi ng bas ic saf ety pr ecau tions 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 man ual. Refer to Safety

Instructions for the mean ing s of DANGE R, WARN­ING, CAUTION, IMPORTANT, and NOTE.

GLOSSARY

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

• DECK is the mowing attachment mounted on

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

• FORW ARD SPEED CONTROL (FSC) cont r ol s

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

• GRASS HANDLING SYSTEM (GHS

mowed material and deposits it in the catcher.



) collects

• POWER TAKE-OFF (PTO) transmits engine

power to run the cutter blades and GHS blower.

• POWERFIL

throughout the interior of the gr ass catcher by
an oscillating delivery spo ut.



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 mo ver, including t he en-

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

• TRANSMISSION LOCKOUT releases the hy-

drostatic transmissions to permit freewheeling
the tractor.

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 d rive. Model and serial num­bers are helpful when obtaining repl acement parts
and maintenance assistance. For ready refer ence,
please record these numbers in the space provided.

• GRASS-PAK

grass delivery s pout (in the catcher) and act i­vates the “full” signal horn when the grass
catcher is full.



SWITCH is mounted on the

• GROUND DRIVE refers to the dual h yd rostatic

transmissions which drive the main wheels.

• HYDROSTATIC TRANSMISSION transmits

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

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

the tractor when the opera tor is seated facing
forward in the tractor seat.

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

Tractor Serial Number Location

Serial Number

SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS

The detailed servicing and repair of the engine,
hydrostatic transmission, and gearboxes are not
covered in this m anual. Only ro utine maintenanc e
and general service i nstructions are p rovided. For
the service of these compo nents 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 wa rranty period may void
the warranty. If you ha ve any difficulty finding 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 manufacturers as
follows:

Mower Deck Serial Number Location

ENGINE SERIAL NUMBER LOCATION

Refer to the engine manu al that accompanies this
manual for the location of the engine serial number.
For the mower model covered by this manual, an en­gine manual is ava ilable cov ering the Ku bota D722
diesel engine (liquid cooled).

Serial Number

Kubota Engines Kubota Tractor Corp.

1300 Remington Road
Schaumburg, IL 60173

Hydrostatic Eaton Corporation
Transmissions 15151 Highway 5

Eden Prairie, MN 55344

Gearboxes (Deck) Tecumseh Products Co.

900 North Street
Grafton, Wl 53024

Engine Serial Number Location

2

Specifications

MODEL

ENGINE

Manufacturer/Model Kubota D722, 3 Cyl., Diesel (Liquid Cooled)
Displacement 44.0 cu. in. (722 cc)
HP (@ 3600 RPM) 20.9
Max. RPM (No Load) 3800
Governed RPM 3600
Max. Torque [ft-lb (N·m) @ RPM] 34 (46.1) @ 2600
Idle RPM 1000
Spark Plug Type N/A
Spark Plug Gap N/A
Crankcase Capacity 3.1 qts (2.9 liters)
Crankcase Lubricant API CC/CD/CE Grade Oil Only with 10W-30 Viscosity or 30W

Fuel Tank Capacity 5 Gallons (19 liters)
Fuel Diesel Fuel 2-D
Cooling System Capacity

(Approx.)
Cooling Fan Electric radiator cooling fan with reversible self-cleaning action
Coolant 50/50 Pre-Mix Antifreeze/Water

MDD

± 50

above 77° F (25° C) Only

1.25 Gallon (4.74 liters)

ELECTRICAL SYSTEM

Battery 12 Volt, 41AH, 340 CCA

(Interstate U1-SP40)
Charging System Automotive Type Alternator
Charging Output 12.5 Amp DC (Regulated)
System Polarity Negative Ground
Ignition Diesel with Glow Plugs
Starter 12 Volt Electric Ring-Gear Type, Solenoid Shift
Interlock Switch Ignition Lockout by Seat Switch, Transmission Neutral and Blade

Clutch
Circuit Breaker Manual Reset (40A)

TRANSMISSION

Manufacturer/Model Dual Hydrostatic, Eaton Model 7, Each Wheel Independently

Driven
Steering Hand Lever Control / Individual Wheel
Forward Speed Control Precision Friction Lock Lever, Cruise Control, with Neutral-Park

Position

3

Specifications

MODEL

TRANSMISSION (continued)

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

Transmission Fluid

Factory Service Mobil 1 Synthetic Motor Oil (15W50)
Alternate Transmission Fluid SAE 30W Straight Viscosity Motor Oil
Transmission Fluid Capacity 1 qt (1 liter)
Transmission Cooling Cooling Fan Mounted on Drive Pulley

Ground Travel Speed

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

BLADE DRIVE

PTO Shaft Quick Disconnect Spline Shaft with Two High-Speed

Blade Spindle Each Blade (2) Mounts Direct on Peerless Right Angle Gearbox

Blade Drive Clutch and Brake Manual Belt Tightener Clutch and Band Brake (Stops Blades

Max. Blade Speed
[25 in. (64 cm) Blade]
@ 3600 RPM Engine

MDD

0-5 (0-8) Infinitely Variable

0-5 (0-8) Infinitely Variable

U-Joints

with Tee Gearbox in Center Connected to PTO Shaft (Complete

Geared Drive, Peerless Model 1000 Gearboxe s)

within Five (5) Seconds of Disengagement)

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

TIRE SIZE

Deck Caster Wheel 2.80/2.50-4 Pneumatic (4-Ply)
Deck Caster Wheel (Optional) 8.25 x 2.75 Semi-Pneumatic
Drive 18 x 9.50-8 (4-Ply)
Rear (Dual) 13 x 5.00-6 (4-Ply)

TIRE PRESSURE

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

4

Specifications

MODEL

DIMENSIONS (Tractor and Mower)*

Length 91 in. (231 cm)
Width 49 in. (124 cm)
Height 44 in. (112 cm)
Wheel Base (Tractor) 42-1/4 in. (107 cm)
Tread Width (Tractor) 29-3/4 in. (76 cm)

MOWER DECK

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

Blade Size (Typical)

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

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

Deck Suspension Torsion-Flex Frame with Caster Wheels and Counterweight

MDD

Multi-Position Deck Support

2 in. (5 cm) Center Overlap

(Two Blades, CW Rotation)

2 in. (5 cm) Center Overlap

(Two Blades, Counter Rotate)

Springs

CURB WEIGHT (Approximate)

SD Tractor Only 760 lb (345 kg)
GHS Tractor Only 850 lb (386 kg)
Tractor and Mower* 1020 lb (463 kg)

*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 72 in.
(107 to 183 cm), with corresponding deck weights ranging from 170 to 400 lb (77 to 181 kg).
Optional (9.5 Bushel) Grass Catcher adds approx. 5 lb (2 kg) and 5 in. (13 cm) in Height

5

Specifications

MODEL

DRIVE BELTS

Engine PTO Walker P/N 7230
Jackshaft Drive Gates 3VX355 (P/N 6231)
Ground Drive Walker P/N 7248
Blower (GHS Model) Gates 3VX280 (P/N 7234-1)

GHS SYSTEM (Optional)

Blower 4 x 10 x 1/4 in. (10 x 25 x 1 cm) Three-Blade Paddle Wheel (Driven

Blower Brake Band Brake (Works in Combination with PTO Clutch, Stops Blower

Max. Blower Speed 3600 RPM
Grass Catcher Capacity 65 Gallons (246 liters)/7.0 Bushels
Optional Grass Catcher Capacity 89 Gallons (335 liters)/9.5 Bushels
Full Signal Oscillating Vane Switch Mounted on Grass Delivery Spout

Powerfil

SEAT

®

MDD

by Mower Engine)

within Five (5) Seconds of PTO Disengagement)

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

FRAME/BODY CONSTRUCTION

Frame All Welded Unitized Steel Chassis
Body 14 Gauge Steel
Deck 11 Gauge Steel
GHS Catcher and Chutes Molded Cross-Linked Polyethylene (UV Stabilized)

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

6

Component Identification

NOTE: Control Identification

shown in Operating
Instructions section.

Catcher Door

Safety Latch

Anti-Scuff

Roller

Catcher Lift /

Dump Handle

Fuel Tank and Cap

Turbine

Precleaner

Grass Handling System

9.5 Bushel Catcher

Tilt-Up

Latch

Spring Clip

Counterweight Spring

Counterweight Spring

and Protective Cover

and Protective Cover

Transmission Control Rod

Adjustment Nut (LH)

Deck Support Pins

and Height Adjustment

Hitch Pins

Tilt-Up

Deck Handle

Tran smission Control Rod

Adjustment Nut (RH)

Deck Support Arms

(Cutting Height Adjustment)

Deck Lift Handle

Front View and Right Side View

Footrests

Til t -U p H o ok

Deck Caster Wheels

7

Component Identification

Spring Protective Cover

Catcher Door Gas

Catcher Lift /

Dump Handle

Instrument Panel

Guard

Instrument Panel Box

(Shock Mounted)

Radiator Cap

Radiator

Catcher Door

Gas Spring

Removable Grass

Catcher Screen

(Not Visible)

Catcher Exhaust

Deflector

Catcher

Door

Catcher

Door Handle

Dump Plate

Fuel

Left Hand

Drive Wheel

8

Radiator

Guard

Radiator

Screen

Rear View and Left Side View

Muffler and

Tailpipe

Filter

Recovery Tank

Tailwheel Fork

and Wheel

Anti-Scuff

Roller

Coolant

Component Identification

Donaldson

Air Cleaner

Air Restriction Indicator

Precleaner Tube

Jackshaft

PTO Gearbox

Dipstick

Air Cleaner

Cover

Muffler

Tailpipe

Overflow Hose

Radiator Cap

Radiator

Radiator

Guard

GHS Blower

Turbine

Precleaner

RH Transmission

Lockout Lever

40 Amp

Circuit Breaker

PTO

Clutch Lever

30 Amp

Circuit Breaker

Positive (+)

Battery Cable

Negative (-)

Battery Cable

RH Hydrostatic

Transmission

Neutral Safety

Switch

LH Transmission

Lockout Lever

LH Hydrostatic

Transmission

Battery

Top View (Engine Compartment)

9

Component Identification

Fuel Pickup

Line

Fuel Return

Line

Fuel Tank

Cap

Starter Motor Below

(Not Visible)

Air Intake

Hose

Injectors

Exhaust

Manifold

Injection

Pump

Oil Fill

Cap

Alternator

Throttle Control

Linkage Lever

Water Temperature

Gauge Sender

Thermostat Housing

and Thermostat

Glow Plug(s)

Water Pump

Fan Motor

Radiator Screen

(Removable)

Radiator Fan

and Shield

Engine Stop Lever Linkage

(Fuel Shut-Off Valve)

10

Top View (Engine Compartment)

Safety Instructions

Pay particular attentio n 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 instr uctions. Fail­ure to comply with safety instructions may result in
personal injury.

The seriousness or degree of imp ortance 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 procedur es, 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 in jury. However, it is neces­sary for the operator to use safe o perating proce­dures at all times. Failure to follow safety

instructions contained 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 sa fety pre­cautions are not taken.

IMPORTANT: Identifies mechanical information

demanding special a ttentio n, since i t deals with th e
possibility of damaging a part or parts of the ma­chine.

NOTE: Identifi es information worthy of special at­tention.

Walker Manufacturing Company

5925 East Harmony Road

Fort Collins, CO 80528

2. Never al low chi ldre n to op erate rider mower.
Do not allow adults to operate without proper
instruction.

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

4. Ke ep e very on e, es peci all y child re n an d 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 protective

footwear.

11

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 hearing
protection is recommended; particularly for
continuous operati on of the GH S Mode l 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 functioning
correctly, so th e engine cannot be starte d 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 li fts off the seat
with the PTO clutch in the ENGAGED position.

10. Handle diesel fuel with care:
a. Use an approved fuel container.
b. Never add fuel to a running engine or hot

engine (allow hot engine to cool several
minutes).

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

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.

3. For a beginning operator, learn to steer (ma-

neuver) the tractor with a slow engine speed
before attempting any mowing operation.

Be aware that, with the front mou nted mower
configuration, the bac k of the tractor swings to
the outside during turns.

4. Remember, for an emergency stop, the forward
motion of th e tractor can always be stopped by
pulling the Forwar d Speed Control (F SC) 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 f reewheel 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 sto pped or moving
slowly, engage the parking brake.

12

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 container

cap securely a nd clean up any s pilled fuel
before starting the engine.

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

NOTE: This is exactly the same procedure used
to normally stop and park the 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 th e machine if these con­trols ar e in the OPERATING position).

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

8. Do not carry passengers - max imum seating
capacity is one (1) person.

Safety Instructions

9. Watch for holes, rocks, and roots in the terrai n
and for other hidde n hazards. When mowing
tall grass, mow hig her than desired to e xpose
any hidden obstacles. Then, clean the area
and mow to the desired height.

10. Avoid sudden start s or stops. Bef ore backing
the machine up, look to th e rear to b e sure n o
one is behind the machine. Watch carefully for
traffic when crossing or working near roadways.

11. Disengage the blade drive when transporting
the machine across drives, si de wa lks , e tc. Ne-

ver raise the mower deck while blades are
rotating.

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

When operating the machine on a slope, reduce
speed and use ca ution to start, stop, and m a­neuver. To prevent tippin g or loss of control of
the machine, avoid sharp turns or sudden
changes in direction.

13. Never adjust cutti ng height with the engine
running. Before adjusting cutting height or
servicing, disengage the blade clutch (PTO),
stop the engine, and remov e the ignition key.
Wait for all movement to stop before getting off
the seat.

NOTE: A blade/blower br ake should nor mally
stop drive line rotation within five (5) seconds of
disengaging the PTO clutch.

14. For side discharge mower decks, do not oper-

ate with the grass deflector chut e removed .

Keep the deflec tor in th e lowest possible posi­tion.

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

the following recommendations:

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

sition.

17. 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 is held closed with springs and the
door may slam shut with considerable force.

18. In case of a clogged or plugged mower deck

or GHS catching system:

a. Disengage the blade clutch (PTO) 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 electrical plug on the fuel

shut-off solenoid.

d. Never place hands under the deck or in the

GHS blower - us e a stick or similar tool to
remove clogged material.

19. If the cutting bl ades strike a solid object o r the
machine begins to vibrate abnormally, immedi-

ately disengage the blade clutch (PTO), stop
the engine, and wait for all moving parts to
stop. To prevent accidental starting, discon-

nect the electrical plug on the fuel shut-off sole­noid. Thoroughly inspect the mower and repair
any damage before restartin g the engine and
operating the mower. Make sure cutter bl ades
are in good condition and blade nuts are
torqued to 60 ft-lb (81.3 N·m).

20. 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.

21. Never remove the radiator pressure cap
when the engine is hot (hot water may spra y
and cause burns).

b. Ne ver tilt body forward with deck in tilt- up

position.

16. 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.

22. Do not use ether or any starting fluid to assist
starting the engine in cold weather.

23. When leaving the machine unattended, dis-

enga ge t he b lade clu tch (PTO), stop t he e n ­gine, and remove the key.

13

Safety Instructions

MAINTENANCE

1. To prevent accidental starting of the engine
when servicing or adjusting the machine, re­move the key from the ignition s witch and dis­connect the electrical plu g on the fuel shut-off
solenoid.

2. To reduc e fire hazards, keep the engine free of
grass, leaves, excessive grease, and dirt.

3. K eep all nuts, bo lts, and sc rews tig ht to e n su 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 o perations or modifications
to the engine may result in unsafe operating
conditions.

11. Use genuine factory replacement parts.
Substitute parts may result in produc t malfu nc­tion and possible injury to the operator and/or
others.

12. 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 disco nnecti ng ca ble s
to the battery.

b. Charge the battery in a well-ventilated

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

c. Ke ep sparks, fla mes, a nd smo king mater i-

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

d. Disconnect both battery cables before

unplugging any wiri ng connectors or mak ­ing repairs on the electrical system.

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

7. The fuel oil injection system operates under
high pressure and can penetrate the skin and
result in serious injury. Unqualified persons
should not remove or attempt to adj us t a pum p
injector, nozzle, or any part of the fuel injec tion
system.

8. 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.

9. Never attempt to di sconnec t any safety devi ces
or defeat the purpose of these safety devices.

10. Do not cha nge the e ngine g over nor setti ngs or
overspeed the engine. The governor has been
factory-set for m axim um- s afe engi ne ope rating
speed.

14

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)

SD Deck Discharge Shield (5848)

Adjacent to Blower Discharge Chute

through Body (5804)

Hydrostat Oil

Front Body Adjacent to

RH Steering Lever (7818)

Radiator Screen Frame Near Radiator Fill Cap (7826)

Reservoir (5810-2)

On Body Adjacent to Clutch

Control Lever (5806)

Right Side of Front Body, Below

Front Body Latch Release (7820)

Rear of Grass Catcher Exhaust Screen (5869)

Rear Cross Member of Front Body (8825)

15

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 list ed below and in the Parts Manual.

Jackshaft Support Adjacent

to Dipstick (7827)

Deck Carrier Frame (8647)

Deck Gearbox Cover (5807-3)

Deck Carrier Frame (5865)

Top of Blower Housing (5819)

Catcher Door Hinge Bar,

LH and RH Sides (5868)

Gear Axle (5810-1)

Catcher Safety Latch,

RH Side (5874)

Right Side, Below Operator Seat (7809)

Left Side of Operator Seat (7819)

Deck Carrier Frame (8653)

16

Instrument Panel (7823-4)

Fender, RH Side (7802)

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 should be noted and reported
to the delivering ca rrier immediately (put in wri ting
within 15 days). The carr ier will provide directions
for proceeding with a claim to receive compensation
for damage.

Tire Installation (Tractor)

• Install the drive ti res usin g the eig ht (8) lug bo lts

that are supplied with the o wner’s packet of mater­ials. 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

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 lev el 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 the battery has

been shipped dry, or is wet but needs service, refer
to the following instructions.

Dry Battery Servic e

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 b attery 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 use by a
trained battery technician.

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):

IMPORTANT: Make sure battery is securely
mounted in the frame. A loose battery may cause
damage to the case resulting in acid leakage and se­vere damage to the machine. A hazard may be cre­ated by damage to cr itical work ing parts and sa fety
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 drin king water to the
bottom of the vent wells.

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

1. Remove the battery ho ld dow n bar, disconnect
the battery cables and li ft the battery ou t 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 cha rge the batt ery. Refer to
Battery Charging.

17

Assembly Instructions

Battery Charging

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 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.

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.

WARNING

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

Battery Clamp Secured

by Wing Nut(s)

Battery Installation

Mower Deck Assembly

Deck Caster Wheels Installation

1. Remove the bolt, nut, axle spacer tube, and
spacer washers from each deck caster wheel
fork.

NOTE: Spacer washers are used only when
the optional semi-pneumatic deck wheels (8.25
x 2.75) are installed.

2. Fit the axle spacer tube through the wheel hub,
position the spacer wa sh er on ea ch si de of the
hub (if used), and fit the assembly into the wheel
fork.

(+) Battery Cable

Connection

18

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 se­vere damage to the machine. A hazard may be cre­ated by damage to cr itical work ing parts and sa fety
systems.

Install the battery in the mower as shown in Battery
Installation photo. Connect the positive and nega­tive cables to the proper battery terminal [red cable

and boot connects to the Positive (+) terminal].

Slide the rubber boot up and over the ba ttery post,
making sure it covers the post completely to pre-

vent an electrical short.

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.

Assembly Instructions

Grease Fitting

Locations

Spacer Washer

Axle Spacer Tube

Deck Caster Wheel Installation

NOTE: If semi-pneumatic wheels are installe d,

make sure the spacer washers fit over the
spacer tube and are not caught between the fork
and the end of the tube. The washers should
move freely on the axle spacer tube.

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

Deck Discharge Shield Installation (Side Discharge Models Only)

Attach the deck side discharge shield by positioning
the shield hinge lug i n fr ont of the deck mou nt and
fastening with two 3/8-16 x 1-1/4 in. bolts, 3/8-16
ESNA nuts, and 3/8 in. wave sp ring washers. Th e
wave washers fit between the two hinging surfaces.
Tighten the nuts until the shield moves freel y but is
not loose.

WARNING

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

Attach Shield

Deck Discharge Chute Installation (GHS Rear Discharge Models Only)

Mount the discharge chute hinge on top of the deck
discharge openin g using the 1/4-20 x 1/2 i n. s oc ket
button head bolt and 1/4-20 ESNA nut. Position the
bolt with the head inside of the chute and the nut on
the outside. Attach spring for tilt-up action from
chute to bracket on deck.

Carrier Frame

Tube Sockets

Attach Guard

Nut on Top

Discharge Chute and PTO Shaft Guard

Installation on Rear Discharge Deck

Attach

Chute

Discharge Shield Installation

on Side Discharge Deck

PTO Shaft Guard Installation

Position the shaft guard as shown and moun t with
two 1/4-20 x 1/2 in. bolts.

Tilt-Up Roller Wheel Installation

Mount the two (2) tilt-up roller whee ls on the brac k­ets on the rear skirt o f the deck housing using the
P/N 8490 axle b olt , 3 /8 in. wa ve s pr in g washer and
3/8-16 in. Whiz loc knut. Tighten the axle bolt until
the wheel rolls freely, but is not loose.

19

Assembly Instructions

Attach Spring

Tilt-Up Spring and Roller Wheel

Installation on Rear Discharge Deck

Mower Deck Installation on Tractor

Roller Wheels

5. Connect the mower deck PTO drive shaft
assembly to the tractor with the splined quick
disconnect coupler. This coupler simplifies
shaft alignment and installation.

a. Use the arrows on the shaft and tube to

align and slide the PTO quick coupler onto
the deck splined shaft.

b. Reaching under the tractor, pull the ring

back on the coupler, slide onto the spline
shaft on the tractor, and release the ring.

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 th e ring in the
full forward position (refer to the Coupler Ring
“Locked” Position photo). After installation,
pull on the shaft to check for security.

Deck Installation

1. Lightly grease each deck support arm (2) on the
tractor. Refer to Mower Deck Installation photo
on next page 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 locat ion). Slide the deck ont o
the support arms: all the way if SD equipped
model, approximately 3 in. (76 mm) if GHS
equipped model.

NOTE: When installing the DSD52 or DSD62
Mower deck, make sure to retract the dolly
wheel after mounting the deck on the tractor.

3. If the deck is rear discharge (GHS equipped
model), the rear discharge chute will need to be
aligned and connected to th e blower inlet dur­ing the last 2 in. ( 51 mm) of sl ide acti on on th e
support arms.

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

Pull Back Spring-Loaded

Coupler Ring

Installing PTO Quick Coupler

Spring-Loaded Coupler Ring

In Fully Forward Position

20

4. Install the hitch pin through the hole on the end
of each suppo rt arm to lock the deck in place
(refer to Deck Counterweight Spring Installa-
tion p hoto). Two (2) hitch pins are inc luded in
the owner’s packet of materials.

Coupler Ring “Locked” Position

Assembly Instructions

6. Raise the front mower body (instead of lifting
the front of deck) and clip the counterweight
springs to the receptacle on front of body.
Lower the front body to tension the springs.
(Refer to Deck Counterw eight Spring Instal-
lation photo.)

Grease Deck

Support Arms

PTO Connection

Arrows on Shaft and Tube

(used to align when slidin g together)

Mower Deck Installation (PTO Shaft Connection)

7. With the counterwe ight springs co nnected, the
weight on the deck caster wheels should be
15 to 25 Ib (7 to 1 1 kg). Check this weight by lift­ing on the front of the deck carrier frame. If
required, the spring tension can be adjusted by
tightening or loosening the elastic stop nuts
located underneath the lower spring hook.
Refer to Deck Counterweight Spring Installa-
tion photo.

Spring Tension Adjus tm ent

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

Deck Counterweight Spring Installation

21

Assembly Instructions

Deck Leveling

1. Position mower on a smooth , level sur face. S et
the cutting height to th e highest position - 4 in.
(102 mm) - for easy acce ss under the deck to
measure blade hei ght. 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 blade
sideways and measure the distance from blade

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

3. Check the front-to-rear level. Rot ate the blades
to point forward. Me asure the distance from
blade tip to ground on t he 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.

4 in. (102 mm)

Wood Block

Should not vary more

than 1/8 in. (3 mm)

side-to-side

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

Deck Leveling

22

Assembly Instructions

PREOPERATING CHECKLIST

Before operating the mower for the first time, and as
a routine before da ily 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 with clean, fresh fuel. Clean diesel
fuel is particularly important since contaminated fuel
will damage the fuel injectors and injection pump.

NOTE: An electric fuel pump makes it unneces­sary to bleed (p urge out air bubbles ) th e d ie se l fuel
injection system when ini tiall y fueling an e mpty fuel
tank.

DANGER

CHECK ENGINE CRANKCASE OIL LEVEL

Check the en gine cran kcase oi l level bef ore use an d
after each 5 hours of continuous operation. Refe r
to LUBRICATION for Checki ng Engine Cra nkcase
Oil Level in Maintenance Instructions.

CHECK AND SERVICE ENGINE AIR CLEAN-

ER SYSTEM

• Check a ir restriction gauge to mak e sure there

is no red indication showing.

• Check condition, cleanliness, and security of

the complete air c leane r sys tem (cl ean ai r filte r
every 100 hours). For detailed procedures,
refer to CLEANING the Engine Air Cleaner
System in Maintenance Instructions.

CHECK ENGINE COOLING SYSTEM

• 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.)

Handle diesel fuel with care. Use safe re­fueling procedures:

• 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 smoke while refueling.

• 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 the coolant levels in the radiator and

overflow tank. If additional cool ant is needed,
refer to CHECKING/SERVICING the Engine
Cooling System in

Maintenance Instructions.

WARNING

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

• Check engine fan belt.

CHECK GEAR AXLE OIL LEVEL

Refer to LUBRICATION for Gear Axle Lubrication
in Maintenance Instructions.

INSPECT FIVE (5) BELTS

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

23

Assembly Instructions

CHECK HYDROSTATIC TRANSMISSION OIL

LEVEL

Refer to LUBRICATION for Checking Hydrostatic

Transmission Fluid Level in Maintenance Instruc­tions.

CHECK BATTERY ELECTROLYTE LEVEL

Refer to CHECKING/SERVICING the Battery in

Maintenance Instructions.

C HECK FUNCTIONS OF INSTRUMENT PANEL

AND WARNING HORN

Tilt-Up Lift Handle

Tilt-Up

Latch

Tilt-Up Latch

Tilt-Up Hook

on Deck

Deck Lock Lever

Turn the ignition key to the RUN position. Voltmeter,
Oil Pressure Warning Light, and Warning Horn
should all operate, indicating normal function.

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 b lades with 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 th e
tractor, make sure to re-engage the deck lock levers
after lowering the deck to the normal operating po­sition.

Deck Secured in TILT-UP Position

CAUTION

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

DANGER

Do not operate the mower with deck in tilt­up position. Do not move t he tra ctor 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·m). If blade sharpening is required,
refer to CHECKING/SERVICING for Sharpen
Mower Blades in Maintenance Instructions.

CHECK DRIVE WHEEL BOLT TORQUE

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

ADJUST MOWER CUTTING HEIGHT, IF RE-

QUIRED

⋅m).

24

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

PERFORM ANY ADDITIONAL PROCEDURES

called for on the MAINTENANCE SCHEDULE

CHART in Maintenance Instructions.

Operating Instructions

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 opera­tion of the mower.

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 s peed; moving it back-
ward toward the IDLE position decreases e ngine
speed.

Throttle

Throttle Location

Parking Brake

Front Body

Latch Release

Blade Clutch

(PTO)

Steering Levers

Forward Speed Control

(FSC)

Operating Controls

25

Operating Instructions

Forward Speed Control (FSC)

Forward Speed Control (FSC) has two functions:
One is to set forward travel speed, and the othe r is
to establish the NEUTRAL-PARK position. When
the FSC lever is move d into the FORWARD posi-
tion, a friction lo ck holds an y forwa rd speed setting
from 0 to 5 mph (0 to 8 km/h). The ground speed is
proportional to the le ver positi on; the furth er 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 and slows or stops for­ward travel. Releasing the steering levers allows
the tractor to resume forward travel at the speed set
by the FSC lever. T o stop and park the machine, the
FSC lever is moved backward to the NEUTRAL-

PARK position. Steering Levers

Each drive wheel is controlled by its own in depen­dent steering lever, for both steering function and
FORWARD/REVERSE motion. The FSC lever sets
the maximum forward s peed, a nd also se ts 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 backw ard lever stroke. The levers
are released to the FORWARD position for “straight-
ahead” ground travel.

Parking Brake

The parki ng brake f unction s by locki ng a pin into the
hydrostatic transmission pi nion gear teeth. Movi ng
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 automo tive automatic transmissi on.
If the tractor is moving when the brake is engaged, it
will result in sud den s toppage an d p os si ble i nte rn al
damage to the axle drive.

NOTE: I f pressure on the parking brake pin (e.g.
parked on a hill) makes it i mposs ible to releas e the
parking brake with the parking brake lever, move the
mower gently forward or backward to release the
pin.

Front Body Latch Release

The front portion of the tract or body hin ges forwar d
for maintenance ac cess and is latched do wn in the
OPERATING position. To raise the body, move the
latch release forward.

26

NOTE: Pushing forward on the steering levers will
not cause any change in tr actor motion - there will
be no steering lev er reaction and there will be n o
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: O n GHS equipped models, the Powerfil
motor and Grass-Pak® full signal swit ch are activa t­ed by engaging the blade clutch. Refer to Using the
GHS Catcher in this section for a complete descrip­tion of GHS operation.

Front Body

Latch Release

Front Body Latch Release

®

Operating Instructions

Transmission Lockout Levers

The transmission loc kout levers disengag e the hy­drostatic transmissons. By lifting the lever on top of
the transmission a nd locking it into place with th e
lockout cam, the hydrostatic tr ansmissions are re­leased to permit freewheeling. By releasing the cam
and lowering the lever, the transmissions are en-
gaged for normal operation. The transmission 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.

Lockout

Levers

Transmission

Plunger

Cold Start Lever (Jackshaft Drive Belt Release)

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

Jackshaft Drive

Engaged

Cold Start Lever - Normal Operating Position

Lockout Lever Location

NOTE: The transmission plunger on the side of the
transmission case (a ct i vated by the LOCKOUT LE­VER) must be completely released during operation

of the mower, otherwise operation of the t ransmis­sion will be erratic.

Jackshaft Drive

Disengaged

Cold Start Lever - Cold Start Position

27

Operating Instructions

The Forward Speed Control also Establishes the Neutral-Park Position of the Steering Levers
LEFT WHEEL

STEERING LEVER

Forward Position

(No Control Change)

RIGHT WHEEL

STEERING LEVER

FORWARD SPEED

CONTROL LEVER (FSC)

Full Forward

Ground Speed

Position

Neutral-Park

Position

Reverse Drive

Wheel Motion

Position

PARKING

BRAKE

Disengaged

Position

Intermediate

Ground Speed

Position

Neutral-Park

Position

Engaged

Position

Disengaged

Position

28

Fast

Throttle

Position

Idle

Position

THROTTLE

Engaged

Position

BLADE CLUTCH (PTO)

Pull Up to Engage

Operating Controls (Top View from Drivers Point of View)

Operating Instructions

Instrument Panel

This illustration shows the configuration of the
switches and ind ic ato rs lo cated on the ins trument
panel.

Voltmeter

Light Switch

(Optional)

Water

Temperature

Gauge

Hourmeter

Oil Pressure

Warning Light

Circuit Breaker - 7 Amp

(Instrument Panel)

Water Temperature

Warning Light

Ignition

Switch

Warning Horn

Powerfil

Circuit Breaker - 10 Amp (Headlights, Safety

Interlock Switch System, Fuel Solenoid Hold,

®

Motor - GHS Only, “Full” Signal Horn - GHS Only)

Instrument Panel

29

Operating Instructions

Voltmeter

The voltmeter displays battery and charging system
voltage. An indication of low or high voltage (the red
area) indicates an electrical system f ailure. The
cause of the failure sh ould be deter mined and cor­rected.

Water Temperature Gauge

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

WARNING

If engine cooling system overheating is
indicated, continued operation of the en­gine, even for a short time, COULD result
in fire, risk of personal injury, and severe
damage to equipment.

Oil Pressure Warning Light

• Engine fan belt

• Thermostat function

Stop the engine and correct the problem before fur­ther operation.

IMPORTANT: Continued operation of the engine
with an illuminated water temperature warning light

MAY result in severe engine damage. Ignition Switch

The ignition switch is used to s tart and stop the en­gine (and preheat the di esel engine). The switch
has four positions: is the glow plug preheat po­sition; “O” is the OFF posi tion; RUN is the pos ition
the key returns to after starting; “S” is the START po­sition. When starting the engine, turn the key clock­wise to the “S” position . Do not hold the ke y in the
“S” position longer than 10 sec onds. If the engine
does not start, return the key to the “O” position for at
least 60 seconds befor e making a restart attempt.
Prolonged cranking can damage the starter motor
and shorten batter y life. Relea se the ke y when the
engine starts, and it will return to the RUN position.
To stop the engine, rotate the key counterclockwise
to the “O” position.

The oil pressure warn ing li ght indi cates tha t eng ine
oil pressure is below the safe operating level [below
7 PSI (48 kPa)]. This light (and warning horn) will
come on when the ignition is turned ON, but should
go off after the engine is s tarted. If the ligh t fails to
come on when the ignition s witch is turned ON, it
could indicate a burned out b ul b. If th e li ght co mes
on during engine oper ation, stop the engine imme­diately and correct the source of the problem before
further engine operation.

IMPORTANT: Continued operation of the engine
with an illumina ted oil pressure warning l ight MAY
cause severe eng ine damage (i f a low oil pres sure
condition exists).

Water Temperature Warning Light

The water temperature wa rning light indicates that
engine coolant tempera ture is abov e the safe oper ­ating 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)

NOTE: When starting the engine, turn and hold the
ignition key in t he glow plug preheat pos ition. The
time required is approximately 10 to 30 seconds, de­pending on engine tem perature. Refer to START-
ING THE ENGINE in this section.

Glow Plug Preheat

Ignition Switch

OFF

ON

START

30

• Low coolant quantity in cooling system

Operating Instructions

Light Switch (For Optional Lights)

Operates headlights (when ins talle d) .

Hourmeter

The hourmeter 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 in terval and w ill conti nue 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***

* These intervals refl ect the actual 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 ope rating conditions, oil changes in

100-hour intervals are ac c eptable . Walker and

the engine manufa cturers recommend engine

oil changes ever y 50 hours in extremely dirty

or dusty conditions or for units with less than

100 hours annual use.
NOTE: The blinking hour glass on the display

means that the meter is operating properly.

C
H
G

C
H
G

OIL

OIL

Hourmeter

Circuit Breakers

Two manual reset circuit breakers are located on the
instrument panel. Each has a button that pops out if
the circuit breaker trips. The 10 amp circuit breaker
protects the circuits to the headlights, fuel valve so­lenoid, safety swi tch r elays and tim e de lay m odule,
and GHS. The 7 amp circuit breaker protects the in­strument panel circuits to the meters, warning lights,
and warning horn.

Warning Horn

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

STARTING THE ENGINE

CAUTION

Before operating the mower , r ead and un­derstand all Safety Instructions and Operat-
ing Instructions.

WARNING

NEVER run the engine in an enclosed or
poorly ventilated area. Engine exhaust
contains carbon monoxide, an odorless
and deadly gas.

31

Operating Instructions

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.

CAUTION

A safety interlock switch system PRE-

VENTS 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 ad-

justed before operating the mower. DO

NOT disconnect safety switches; they are

for the operator’s protection.

NOTE: For starting in cold weather [below 40° F

(4° C)], use the 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, raise the lever to re-engage the jackshaft

drive belt.

3. Move the throttle 1/4 to 1/2 open (toward

FAST) and turn the ignition switch to the
START position to start the engine. Release

the key to the RUN position as soon as the
engine starts.

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 fo llow the se guideline s can
damage the starter motor and shorten battery
life.

TROUBLESHOOTING NOTE: If the engine
cranks but does not start, check the following:

• The fuel valve solenoid is operating. Look at

the exhaust pipe when cranking the engine - no
smoke indicates no fuel is reaching the cylinder.
If the solenoid is not operating, contact your
Walker Dealer.

• The glow plugs are operating. Look at the

exhaust pipe when cranking the engine - white
smoke indicates improper glow plug operation
and inadequate preheat. Consult the Kubota
Workshop Manual to check glow plug function.

4. After the engine starts, make sure the oil
pressure light goes off. If n ot, stop the e ngine
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.

32

Cold Start

Lever Engaged

Jackshaft Drive Belt Release

2. Turn and hold the ignition key in the PREHEAT
position to prehea t the en gine glo w plug s. For
temperatures below 35° F (2° C), the time
required is approximately 25 to 30 seconds. For
temperatures 35° F (2° C) or higher, the time
required is approximately 10 to 15 seconds.

Operating Instructions

ADJUSTING GROUND SPEED AND STEERING

IMPORTANT: If the DSD52 or DSD62 Mower

deck is installed on the tractor, make sure the
dolly wheel is retracted BEFORE moving.

CAUTION

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

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.

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).

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 the parking
brake.

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., p ull the LH lever to turn
left. To minimize the possibility of overcontrol,
use only one hand on both steering levers.

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 the mowe r 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 operate the steering levers with

smooth action. Jerky movements are hard
on the transmission and lawn. For sharp
turns, do not allow th e insid e whee l to stop
and twist on the grass . Pull the steer ing 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 wh ere you are
aiming.

♦ Remember, for an emergency stop, or in

case of loss of control, mach ine movement
can always be stopped quickly by pulling
the Forward Speed Control into the NEU­TRAL-PARK position.

NOTE: This is exactly the same procedure

used to normally stop and park the machine.

33

Operating Instructions

Pull Steering Levers

With Left Hand

Forward Speed Control

(FSC)

Correct Operator Hand Position on the Controls

3. Reverse directio n of the m ower by pu lling 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.

Keep Feet On Footrest

When Moving

ENGAGING THE MOWER

1. Set the engine throt tle at ab out 1/3 s peed. Do

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

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

2. Pull the blade clutch lever SLOWLY up to
engage 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 operato r 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.

4. The FSC may be adjusted forward for faster
ground speed and bac kw ard for s lower ground
speed. When mowing, ground speed should
be adjusted to match the load on the cutter
blades, i.e., as t he eng ine pull s down i n heavy
cutting, pull back on the FSC lever to reduce
ground speed. A djusting 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
(tractor not moving) and then moving th e FSC
lever to the NEUTRAL-PARK position.

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

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 stationary ob­ject while mowing, stop the mower imme­diately, disconnect the electrical plug on
the fuel shut-off solenoid, 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 In-
structions if blades are out of time. Als o,
make sure the blade retaining nuts are
torqued to 60 ft-lb (81.3 N·m).

34

Operating Instructions

Engaged

Position

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 repaired before op­erating the mower. Contact your Walker
Dealer.

Blade Clutch Engaged

Disengaged

Position

Blade Clutch Disengaged

STOPPING THE MACHINE

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

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

3. Disengage the blade clutch.

4. Slow the engine to idle, put throttle in IDLE
position; and turn the ignition switch OFF.

WARNING

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

5. Engage the parking brake.
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 tr ansmissions, especially
when transmission fluid is warm.

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. W ait for all move­ment to stop before getting off the seat.

35

Operating Instructions

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 ho les] in 1/2 in. (13 mm) incre­ments.

Lockout Lever

Lift Handle

Deck Support

Pin

Hitch Pin

Cutting Height Adjustment

TRANSMISSION LOCKOUT
IMPORTANT: DO NOT TOW this mower with the

transmission lockout engaged. Towing can produce
excessive interna l pressure an d damage th e trans­mission.

To mo ve 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 transmissi on lockout lever on both th e
RH and LH transmissions and secure into
place with the locking cam.

Plunger

Depressed

Lockout Lever - Freewheel Position

4. After moving the mower, release the locking
cam, placing the lever DOWN in the normal
OPERATING position. Make sure the
transmission lockout plunge r on the side of the
transmission case (activated by the lockout
lever) is completely released, otherwise the
transmission operation will be erratic.

Plunger

Released

Cam in

LOCKOUT

Position

Lockout Lever

Cam in

UNLOCKED

Position

36

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 - Normal Operating Position

Operating Instructions

RECOMMENDATIONS FOR MOWING
IMPORTANT: Operate the engine at full speed

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

• Keep the mower deck and discharge chute clean.

• Mow with shar p blades. A dull blade tea rs 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 appearanc e, cut off 1/3 or less of
existing grass height.)

• 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 caus es the mow ing bla de to not
cut clean and tear the grass. The engine is

designed to be operated at full speed.

• Whe n mowing in adverse condition s (tall and/or

wet grass), mo w the grass twi ce. Raise the mo wer 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.

• 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 op erating on a slope, reduce speed 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 - Do Not Operate

on Steep Slopes

• Use an alternating stripe mowing pattern for

best appearance and vary the direction 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 sm oot h co ntrol mov e­ments of the steering levers since the hydrostatic

transmissions are “power boosted controls” and
jerking the levers can easil y sl ip the t ir es . 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).

Maximum Recommended Side Slope

37

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) an d the GHS di scharge c hute 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 posit ion. This can

cause the deck to unhook from the tractor and fall
with considerable force , poten tiall y caus ing dec k or
tractor damage and/or bodily injury.

• Whe n transporting a tr actor with the d eck 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 wheels (caus­ing breakage). This wi ll al so prev ent t he d ec k from
unhooking from the tractor and falling, potentially
causing deck or tracto r damage. Damage to other
items parked in front of the deck may also occur.

38

Operating Instructions

GRASS HANDLING SYSTEM (GHS)
GHS Model Only

Actuator

“Full” Signal

PTO

Clutch

Rod

Horn

Powerfil

Drive Motor

®

Catcher Door

Safety Latch

Exhaust Screen

(Removable)

Grass-Pak
Vane Switch

Exhaust

Deflector

®

PTO and Blade

Gear Drive

Rear Discharge

Mower Deck

Blower

Deck

Discharge Chute

Dump Handle

Powerfil

Delivery Spout

Body Chute

Assembly

Catcher

Door

Catcher

Door Spring

Grass Catcher

®

GHS Flow and Components

39

Operating Instructions

General Information

The Grass Handling System (GHS) consists of a
rear discharge mower deck connected to a 10 in. (25
cm) blower and a rear mounte d grass catcher wit h

7.0 bushel (246 liters) capacity or optional 9.5

bushel (335 liters) capacity. The GHS blower oper­ates any time the mower blade clutch is eng aged
and moves grass thr ough the rear discharge de ck
chute into the grass ca tcher. Blower airflow is ex­hausted out the back of the grass catcher, through a
filtering screen. When the grass catche r is full and
needs to be emptied, a “full” signal horn alerts the
operator. When the “full” signal horn sounds, it is
important to stop mowing to prevent overfi lling and
clogging of the blower system.

IMPORTANT: No rmally, the GHS blower operates
with no maintenance or cleaning required. However,
under certain operating conditions, the inside of the
blower housing may accumulate a deposi t of dirt,
causing wear and binding of the blower wheel.
Normally, dirt buildup occurs when mowing a com-
bination of dirty and damp grass, especiall y in
the springtime. When operating in these condi­tions, check the blower wheel frequently for
binding and clean the blower hous ing as requir ed.
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 intake
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

Blower Intake Cover

NOTE: An alternative to using the blower intake

cover when a side discharge or mulchin g deck is
installed on a GHS model is the blower lockout kit
(P/N 6541). The blower lockout kit releases ten­sion on the blower dr ive belt and does not req uire
the blower intake cover.

NOTE: In A utum n, whe n using the GH S mo wer t o
vacuum leaves, it is recommended to raise the front
of the mower deck 2 to 3 notch es [1 to 1-1/ 2 in . (2 5
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 sufficient
force to cause serious injury to bystand­ers or property damage.

DANGER

ROTATING BLOWER BLADES

NEVER operate the GHS blower with the
blower discharge chute un covered (gr ass
catcher in the dump position) since dan ­gerous 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.

40

Operating Instructions

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

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

will stop. Also, the mower deck will begin to leave a
trail of grass clippi ngs. When th is occurs, sto p the
engine, disconnect the electrical plug on the fuel
shut-off solenoid, 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 dev el op at the ba ck
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 clogg ing begins to deve lop.
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.

Blades Must Operate at

Right Angles (90 Degrees)

FORWARD

• Check the amount of flat section re maining at

blade tip. This is the are a that is g round aw ay (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 dis charge of grass cl ippings into the
blower chute is m arginal. Replac e cutter blades if
less than 3/4 in. (19 mm) flat section remains at the
blade tip.

• Check th at the interior of the dec k 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 mowi ng
grass and/or weeds whic h ar e “jui cy.” The material
collects under the deck with sticky, green juice. Clo­ver and weeds are especially a problem. The mow­er 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.

• 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.

Rear Discharge

Torque = 60 ft-lb

Chute

Blade Rotation for GHS Mower Deck

(view from underneath)

Mounting Nut

(81.3 N

⋅m)

• Check the bl ower disc harge chu te into the gr ass

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.

41

Operating Instructions

• Check th at 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.

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

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 serio us injury.

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

Housing in Maintenance Instructions.

Using the GHS Catcher

Powerfil

The GHS catcher has an oscillating grass delivery
spout (POWERFIL
grass clippings thr oughout 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 movi ng the
blade clutch to the ENGAGED position. The spout
should oscillate approximately 25 cycles per
minute.

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 an d 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.

®

®

) which is designed to spread

The “full” signal horn is designed to operate (sound)
when the grass catcher is almost full. The timing of
the signal is adjus table by chang ing the pos ition of
the vane on the Grass-Pak
coming on too soon (catcher not completely full) or
too late (grass cl ogging in cat cher spout a nd deliv­ery chute), refer to ADJUSTMENTS for GHS Signal

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

sound BEFORE the catche r is completely full to
give the operator time to react and stop mowing. An
indication the horn s ig nal is c omi ng on to o l ate (d e ­layed 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 f or cleaning,
open the catcher doo r, push forward and pul l down
on the grass catcher screen knobs (on either side of
the screen), and slide the screen ou t. Use a high
pressure washer or water spray and brush to clean
the screen.

Keeping the catcher exhaust screen clean and open

®

is essential to good performance of the catching
system. In some mowing condition s, e.g., wet and
dirty, it will be necessary to clean the screen fre­quently to avoid cl ogging the mower deck, blower,
and chutes due to airflow restriction.

®

switch. If the s ignal i s

42

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 hor n should s ound as the sw itch is
moved in both directions.

®

vane by hand as it

Operating Instructions

Grass Catcher

Screen

Removal

Knobs

(Not Visible)

Grass Catcher Screen Removal for Cleaning

Dumping the Catcher

For dumping, th e cat ch er e ithe r tailg ate du mps int o
a disposal area or dumps into the optional dump
bag. The dump bag i s a reusable nylon fabric bag
desi gn ed to conv eniently move grass cl ippings from
the catcher to a remote disposal area or container.

Tailgate Dumping

1. Open the back door by lifting on the door handle.
NOTE: To prevent accidental door closure,

a safety latch locks the door open in the
fully opened position while the catcher is be­ing dumped.

2. Tilt the catcher back to dump by lifting on th e
catcher lift handle on the l ower front corner of
the catcher.

Safety

Latch

Catcher Door Safety Latch

Using the Dump Bag

1. Open the back door by lifting on the door
handle.

NOTE: To prevent accidental door closure,
a safety latch locks the door open in the

fully opened position while the catcher is be­ing dumped.

2. Orient the dump bag with one of the handle
straps on the bag opening facing up.

Tailgate

Door

Handle

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

to drop down.

4. 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. Then,
smoothly close the d oor, working against the
spring pressure that holds the door closed.
DO NOT let the door slam shut by releasing
the door before i t is c l os ed.

Hook Bag

on Bumper

Positioning Dump Bag on Catcher

43

Operating Instructions

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

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

Catcher Lift/

Dump Handle

Power Dump Option

When equipped with the optio nal power dump sys ­tem, the operator dumps the catcher while sit tin g in
the seat. A toggle s witch oper ating a p ower 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 clut ch ratcheting for an
extended time as this will cause extra w ear on the

clutch mechanism.

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.

Dumping Catcher into Dump Bag

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

to drop down.

6. 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. Then,
smoothly close the d oor, working against the
spring pressure that holds the door closed.
DO NOT let the door slam shut by releasing
the door before i t is c l os ed.

NOTE: If grass tends to hang up in the catcher af­ter raising the catcher with the power dump, “jiggle”
the steerin g levers and make the tr actor bounce a lit ­tle to unstick the grass an d make it slid e 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.

44

Operating Instructions

Grass Catcher

Cable
Guide

Lift Channel

Rear Body

Panel, RH

Power Dump

Ram Actuator

Door Actuator

Arm

Catcher Door

Gas Spring

Fork

Catcher Door

Cable Rod

Guide

Cable Assembl y

Rear Body

Panel, LH

Gas Spring

Actuator Mount

Assembly

Dog Leg

Assembly

Rubber

Bumper

Power Dump Components

45

Maintenance Instructions

MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MDD

CAUTION

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

Service Item

Check Engine Crankcase Oil Level x 48
Check Coolant Level in Radiator

and Overflow Tank
Clean Radiator Screen and Cooling Fins* x 57

Check Security of Air Filtration Components x 61
Check Air Filter Restriction Gauge x 56
Clean Grass Buildup Under Deck x 58
Clean GHS Exhaust Screen* x 42
Clean GHS Blower* x 59
Service Mower Blades x 62
Check Functions of Instrument Panel and

Warning Horn
Lubricate Grease Fittings and Oil Points* x 49

Check PTO Gearbox Oil Level** x 53
Check Battery Electrolyte Level x 61
Check Hydrostatic Transmission Fluid x 54
Check Tire Pressure x 61
Check Drive Belts (Jackshaft, Engine PTO,

GHS Blower , Ground Drive and Engine Fan Belt)
Check Gearbox Oil Seals x 63
Check Turbine Precleaner* x 55
Check/Clean Air Filter Element*** x 56

Change Engine Crankcase Oil
Check Fan Belt Tension x 60
Check Blade Brake Action x 63
Check Oil Level in Gear Axle x 53
Clean Hydrostatic Transmission Cooling Fins x 59
Change Engine Oil Filter x 48
Check Radiator Hoses and Clamps x 63
Check Fuel Lines and Clamps x 63
Replace Air Filter Element and

Vacuator™ Valve***
Replace Fuel Filters x70
Flush Radiator and Change Coolant x 58

Service Battery x61
Check/Adjust Vertical Position of
Grass-Pak
Change Gear Axle Oil
Replace Radiator Hoses and Clamps x 63
Replace Fuel Lines and Clamps x63

®

Switch

∆∆

∆

Daily

x60

x24

25

Hours

x63

100

Hours

x48

200

Hours Yearly

x56

x72

Every

2Years

x53

Ref.

Page

46

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

IMPORTANT TIPS FOR CARE OF KUBOTA 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 or after 6 cleanings

∆ Change engine oil and filter after first 35 hours of operation of a new engine (break-in period)

∆∆ Change every 2 years or 1000 hours

Maintenance Instructions KUBOTA TIPS

IMPORTANT TIPS FOR CARE OF THE KUBOTA ENGINE

Fuel System

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

ganic material. Fuel contamination will greatly short­en the life of the fuel injection pump and injectors.

• Chang e fuel filters on a reg ular basis and when

contamination is suspected or found in the fuel.

• Model MDD is equipped with an electric fuel

pump; therefore it is normally not necessary to bleed
air out of the fuel system (after running out of fuel or
fuel system maintenance).

• When checking and bleeding the fuel system use

the air vent plug on the fuel filter and the injector
pump. DO NOT attempt to bleed the fuel system by
loosening fuel lines on the fuel injection pump as this
could damage the pump.

Starting/Stopping

• DO NOT use ether or any starting fluid in the

air intake. This will damage the engine.

• For starti ng in co ld weath er [be lo w 40° F ( 4° C) ],

use the 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 viscos ity to the am bient tem -

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

• Allow eng ine to ru n at idle for a few se conds be-

fore stopping engine to avoid run-on or backfiring.

• 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 di rt to enter the e ngine. Also, af­termarket filters often ski mp on the filtration media
and require more frequent cleaning and replace­ment (see following instructions).

• Use the a ir flow restri ction gauge to indicate the

need to service the air filter.

• DO NOT over service or freq uently “disturb ” the

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

• Do frequ ently c heck the Turbine Precleaner for

free movement of the internal fan.

• 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 cloth and

wipe the interior of the canis ter and hose clean (a
little dirt left here will be sucke d int o the eng in e and
reduce engine life). When the filter is reinstalled,
make sure the element is held tight and straight
in the canister for proper seating and sealing.

• Periodically check the air intake hose for cuts,

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

Oil

Cooling System

• Fill the cooling system wi th a pre-mixed solution

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

IMPORTANT: S olution must be pre-mixed before
putting it in the engine (addi ng pure antifreeze int o
the radiator may cause damage to the engine by
causing overheating).

• Use any top quality oil with an API classification of

CD or greater. DO NOT use oil that is rated for gas­oline engines only (API SE/SF) as this will cause
problems in a diesel engine.

• Single viscosity or multi-viscosity oils may be

used with the viscosity m atching ambient te mpera­tures for the en gine opera ting condition s. Thi s will
aid starting in cold weather and assure proper lu­brication in hot weather.

• Use o nly Kubota oil filters. Afterm arket filters

may not seal properly and/or have the incorrect

pressure relief valve for proper lubrication.

47

Maintenance Instructions LUBRICATION

LUBRICATION

WARNING

DO NOT attempt to lubricate the machin e
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

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 35 hours. Thereafter, change oil after
every 100 hours of operation.

Checking Engine Crankcase Oil Level

IMPORTANT: DO NOT operate engine without
a sufficient oil supply in the crankcase. DO NOT
operate with the oil level below the lower mark or
above the upper mark on the dipstick.

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

not above, the upper mark on the dipstick.
IMPORTANT: DO NOT overfill the crankcase

(oil above upper mark) a s th is CAN result in
engine overheating, loss of power, and possi­ble engine damage.

Upper Mark

Check the engine crankcase oil level before use and

after each 5 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 eng ine is

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

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 out
of the engine.

3. Remove the dipstick, wipe o ff with a clean r ag,
then reinsert the dipstick into the tube and press
all the way down.

4. Remove the dipstick again and check the oil lev­el on the dipstick. The oil level should be within
the “Operating Range” on the dipstick (between
the lower mark and the upper mark).

Lower Mark

Dipstick Operating Range

Changing Engine Crankcase Oil/Oil Filter

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).

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. Before removing the dipstick and oil fill cap,
clean the area aroun d them to keep a ny dirt o r
debris out of the engine.

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

48

Maintenance Instructions LUBRICATION

7. Install the ne w oil fi lter on the engin e. Turn the
filter clockwise un til the ru bber g aske t contacts
the sealing surface, then tighten the filter an

additional 1/2 turn.

8. Reinstall the drain pl ug. Make sure it is ti ght­ened to 10 ft-lb (13.6 N·m).

9. Fill the crankcase with new, clean oil. Use only
crankcase lubricants recom mended by the en-

Specifications in

Drain Plug

Oil Drain Location

(view from left side of tractor)

4. Before removing the oil filter, clean the area
around the filter to keep dir t and debris out of
the engine.

gine 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 co ld weather and as­sure proper lubricati on in hot weather. Fill up
to, but not above, the upper mark on the dip­stick. Crankcase capacity is 3.1 quarts (2.9 li­ters) plus 1/2 pint (.24 liters) for the new oil filter.

IMPORTANT: DO NOT use oil that is rated for
gasoline engines only (API SE/SF). This will
cause problems with a diesel engine.

Oil Filter

Oil Filter Location

5. Remove the old oil filte r and wipe off the filter
mounting surface on the engine.

6. Apply a thin coati ng of clean oil to the rubber
gasket on the replacement oil filter.

IMPORTANT: Use ONLY oil filters from the en­gine manufacturer (Kubota 15841-32439). Af­termarket oil filters may not seal properly and/or
may not have the correct pressure relief valve
for proper lubrication. Also, the filter length di­mension is critical for tailwheel clearance.

IMPORTANT: Check the dipstick reading be­fore adding the last 1/2 pint of o il and fill on ly to
the upper mark. DO NOT overfill the crank­case (oil above upper mark) as this CAN result
in engine overheating, loss of power, and pos ­sible engine damage.

10. Start the engine and check for oil le aks aro und
the oil filter. Stop the engine, recheck the oi l
level, and add oil if ne cessary. (When the en­gine is first operated with a new o il fil ter, the oil
level drops slightly as the filter is filled with oil.)

Grease Fitting and Oil Point Lubrication Lubricate the grease fi ttin gs and oil points after ev-

ery 25 hours of operatio n. Lubricate more often

when operating in dusty or dirty conditions. Use
SAE general purpos e lithium or mol ybdenum 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 j oints ( on t he d ec k and tr ac -

tor) require routine lubrication after every 8 hours
of running time.

49

Maintenance Instructions LUBRICATION

Ident Lubrication No.
No. Location Type Places

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 %ODGH'ULYH*HDUER[ 2LO
 7HH*HDUER['HFN 2LO
 'HFN&DVWHU:KHHO%HDULQJ *UHDVH 
 8QLYHUVDO-RLQW6KDIW$VVHPEO\ *UHDVH
 3LYRW$VVHPEO\7LOW8S'HFN *UHDVH 
 'HFN6XSSRUW$UP6RFNHW *UHDVH 
 %RG\+LQJH3RLQW 2LO 
 )6&$FWXDWRU5RG3LYRW3LQV 2LO 

 )6&/HYHU3LYRW *UHDVH 

 )6&/HYHU)RUN *UHDVH 

*UHDVH6OLGH$UHD
 6WHHULQJ/HYHU3LYRW *UHDVH 
 'HFN6XSSRUW$UP3LYRW *UHDVH 
 'HFNWR372&RXSOLQJ *UHDVH 

*UHDVH6OLGH$UHD
 8QLYHUVDO-RLQW7XEH$VVHPEO\ *UHDVH
 8QLYHUVDO-RLQW4XLFN&RQQHFW *UHDVH 

6SOLQH*UHDVH6OLGH$UHD
 3DUNLQJ%UDNH/HYHU *UHDVH 
 *HDU$[OH 2LO
 %HOW7LJKWHQHU3LYRW *UHDVH 

*URXQG'ULYH
 372&OXWFK/HYHU3LYRW *UHDVH 
 &OXWFK$FWXDWRU3XVK5RG *UHDVH 
 %UDNH$FWXDWRU5RGDQG%UDNH 2LO 

%DQG3LYRW3LQV&OHYLV

 
 

 

 

 

Ident Lubrication No.
No. Location Type Places

 7KURWWOH&RQWURO&DEOH(QGV 2LO 
 &ROG6WDUW/HYHU *UHDVH 
 &DWFKHU+LQJH3RLQW 2LO 
 5HDU:KHHO%HDULQJV *UHDVH 
 (QJLQH'LSVWLFN2LO)LOOHU 2LO
 %HOW7LJKWHQHU3LYRW *UHDVH 

%ORZHU'ULYH*+60RGHO2QO\
 372*HDUER['LSVWLFN 2LO
 +\GURVWDWLF'ULYH 2LO
 )6&)ULFWLRQ%RG\3LYRW *UHDVH 
 7KURWWOH&RQWURO3LYRW 2LO 

 

 
 

* Gearboxes are permanently lubricated and

sealed requiring no scheduled lubrication.
Oil level should be chec ked onl y 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, Tractor PTO Gearbox Lubrication, and
Hydrostatic T ransmission Fluid in this se c-

tion.

127( '*+67LOW8S'HFNLVVKRZQIRUUHIHUHQFH)RURWKHU

'HFN /XEULFDWLRQ 3RLQWV 5HIHU WR 'HFN DQG &DUULHU

)UDPHIllustrated Parts Manual

50

Maintenance Instructions LUBRICATION

223

11

4

6
7

6

8

12

13
18
30

23 & 32

31

4

5
6

7
6
8

9

10

12

11

13
14

15
16
17

18

19

20

30

29
28

27

25 2526

23

24

21

22

Chassis and Deck Lubrication Points

51

Maintenance Instructions LUBRICATION

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

decks with gear-drive n 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 sc heduled lubrica tion. Howev­er, the gearbox oil seals shou ld be checked every

25 hours for indication of an oil lea k; 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.

Blade Drive

Gearboxes

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.

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

DSD52 or DSD62 Mower Deck Lubrication

There are several sp ecial lubrication requiremen ts
for the DSD52 or DSD62 mower deck in additi on to
the requirements detailed in the Chassis and Deck
Lubrication illustration. Lubricate the locations
shown in the Blade Spindle Lubrication and Gear-
box, Dolly Wheel, and U-Joint Lubrication photos
and check and maintain oil in the belt drive gearbox.

Tee

Gearbox

Mower Deck Gearboxes

(shown with gearbox cover removed for clarity)

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

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) 90W oil until the oil level is up to (sub­merges) the horizontal shaft in the gearbox
(shaft parallel to cover plate).

1. Lubricate the blade spindles every 25 hours
with two (2) shots of SAE general purpose lithi­um or molybdenum base grease.

Blade

Spindles

Blade Spindle Lubrication

52

Maintenance Instructions LUBRICATION

2. Check the oil level in the belt drive gearbox
every 100 hours (or sooner if a visi ble oi l leak
has developed). With the deck in th e normal
operating position, r emo ve the lev el plu g in th e
side of the gearcase. Add S AE E.P. (Ex treme
Pressure) 90W o il to main tain the oil level t o 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.

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

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

Belt Drive

Gearbox

Jackshaft

PTO

Gearbox

Dipstick

Dipstick Location, Tractor PTO Gearbox

Changing Gearbox Oil

The tractor PTO gearbox is oil filled and vented. No
scheduled oil change is required. However, chang­ing the oil after the first 100 hour break-in period
will extend gearbox life and is recommend ed.

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

Dolly Wheel

Pivot

U-Joint

Gearbox, Dolly Wheel, and U-Joint Lubrication

Tractor PTO Gearbox Lubrication

Checking Gearbox Oil Level

Check the gearbo x oil le vel every 25 hours, an d if
necessary, add oil [SAE E.P. (Extreme Pressure)
90W 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.

Level 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) 90W gear lube.

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

Gear Axle Lubrication

• The gear axle oil lubrication is SAE 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.

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

years.

53

Maintenance Instructions LUBRICATION

Hydrostatic Transmission Fluid

Checking Hydrostatic Transmission Fluid Level

Hydrostatic transmission fluid level should be
checked every 25 hours of machine operation. It is
preferable to check the fluid level when fluid is
cold. Check fluid level as follows:

1. Park the mower on a level surface. St op t h e
engine and wipe dirt and contaminants from
around the reservoir cap and air bleed plug.

IMPORTANT: Before removing the reservoir
cap, clean any dirt from around it. Any dirt or
contaminants entering the transmission will ac­celerate wear and eventually cause loss of pow­er to the drive wheels.

2. Remove the reservoir cap and ch eck the level
of the fluid. The reservoir has a fluid level COLD
mark and HOT mark. The reservoir oil level

should ALWAYS be at or above the COLD
mark and NEVER above the HOT mark.

Reservoir Cap

b. If no fluid leaks from aro und the air bleed

plug:
* Slowly add fluid into the reser voir until

fluid starts to leak from around the plug.
(Transmissions are serviced from the
factory with Mobil 1 (15W50) Synthet-
ic Oil). When it is necessary to add flu­id, refer to Specifications for the proper
fluid.

* As soon as there is fluid leaking from

around the air bleed plug, tighten the
plug and fill the reservoir to the COLD
level mark. Wipe any excess oil off of
the transmission housing.

IMPORTANT: DO NOT overfill the transmission
reservoir . This will result in oil leaking out of the res­ervoir cap vent when the transmission warms up. It
is preferable to add fluid to the transmission when it
is cold and make sure the oil is not above or be-

low the COLD level mark.
IMPORTANT: The transmission reservoir has a fine

mesh screen in the bottom to trap dirt and foreign
particles from entering the t ransmissio n. When fill ­ing the reservoir, fluid will flow quite slowly through
this screen; so it is essential that there is fluid at the
bleed plug before the transmission is considered
full.

Hot

Level

Air Bleed

Plug

Transmission Reservoir

and Air Bleed Plug Location

3. If the fluid is below the COLD mark (or the trans­mission is not performing properly), loosen the
air bleed plug (located on the top of transmis­sion case next to the plastic reservoir).

a. If a small amount of fluid leaks from around

the air bleed plug:
* The transmission is full of fluid.

* Tighten the plug and fill the reservoir t o

the COLD level mark.

Cold Level

IMPORTANT: Any attempt to remove or in any way
alter the filtering screen in the transmission reservoir
could cause damage to the transmission and will
VOID any transmission warranty.

54

Maintenance Instructions CLEANING

CLEANING
Engine Air Cleaner System

There are two main com ponents in the engine air
cleaner system: a turbine precleaner and a Donald­son Radialseal™ air clea ner. Ea ch 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 pr ecleaner is mounted o n a remote air
intake tube connected to the Donaldson air cleaner.
A spinning fan driven by the intake airflow separates

Air Restriction

Turbine Precleaner

dust from the air, giving the initial stage of air clean­ing. Dust particles are exhaus ted through a single
small vent in the side of the housing. Since no dust
is trapped, the preclean er operates without clean­ing. The only maintenance r equ ir ed is to ch eck the
operation of the internal fan every 100 hours. Verify
operation:

1. Look into the exhau st vent while shi nin g a li ght
into the intake.

2. Start the engine and watch the fan begin to spin
as the throttle is advanced.

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

Donaldson Air
Cleaner Cover

Gauge

Hose

Clamp

Air Intake

Hose

Precleaner Tube

Hose

Clamp

Hose

Clamp

Engine

Safety Filter

Donaldson

Air Cleaner

Vacuator™

Valve

Air Cleaner

Cartridge

Engine Air Cleaner System Components

55

Maintenance Instructions CLEANING

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, eliminat­ing the possibility of dust leaks due to improper filter
installation. Intake design, interna l baffling, and a
Vacuator™ valve provide dust separation and auto­matic precleaning action. Daily or frequent servicing
of the air cleaner is not required. Use the air re­striction gauge o n the air cleaner outlet to indicat e
when the air filter needs serv icing -- 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.

Cover

Canister

Vacuator™

Valve

Radialseal™

Filter Element

Push Button to Reset

Indicator After Service

Air Restriction

Gauge

Air Restriction Gauge Location

Clean and inspect the paper element after every
100 hours of service and replace the element year­ly or after six (6) cleanings (or when dirt y or dam-

aged). More frequent cleaning may be required
when operating in extremely dusty conditions as in­dicated by the air restrict ion gaug e. Servic e the air
cleaner as follows:

1. Release the top and bottom c over latches and
remove the ai r clean er cover. Wash the co ver
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 da maged.
The lips of the valve should close and fit togeth­er; any cracks, deformation, or wear in the valve
is cause for replacement.

56

Cover Latch

Air Cleaner Components

(shown with cover being removed)

IMPORTANT: The Donaldson air cleaner uses a

dry paper-type filter element. NEVER ap ply oil to
the paper element.

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. Clean the filter element using low pressure
compressed air [les s than 100 PSI (68 9 kPa)].
Blow out the filter from the interior of the ele­ment while turning the element.

NOTE: Washing the element in water or clean­ing solution is not recommended. Replace the
element if it does not clean up with compressed
air.

Maintenance Instructions CLEANING

4. Use a bright light inside the element to inspect
for damage. Check the e lement very ca refully
for pin holes or other damage that will allow
dirt to leak through the paper me dia. Replace
element if necessary.

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

6. 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.

7. Check the outside surface of the outlet tube for
smoothness and cleann ess (this is the seal ing
surface).

8. Insert and seat the filte r element carefully into
the canister, applying pressure at the o ute r rim
of the filter; not at the flexible center. Make sure
the filter element is completely in place befor e
installing the cover.

9. 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 goe s 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.

Cover Latch

Vacuator™

Valve

Proper Orientation of Air Cleaner Cover

10. Che ck the air intake hose for cuts, nicks, etc.,
and the hose clamps for tightness.

11. Res et the air restrict ion indicator (p ress button
on bottom).

Orient to Top

of Canister

Cover Latch

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 surface of the filter; use tal­cum powder or dry silicone lubricants if required
for filter installation.

Radialseal™

Filter Element

Radial Sealing

Surface

Air Filter Element Replacement

Canister

Safety Filter

Engine Cooling System

Radiator Screen and Cooling Fins

To p revent the en gine from overheating and possi­ble engine damage, clean grass clippings, chaff,
and dirt from the f ine mesh radiator intake screen
daily. In certain mowing conditions (dry grass,
leaves, tree “cotton” , etc.), it may be necessary to
check and clean the screen several times during use
to prevent engine overheating.

1. Lift to remove the screen. To clean the screen,
wash with soapy water or blo w out with com­pressed air.

2. Inspect the radiator cooling fins for material
lodged in this a re a wh ic h w oul d r es tr ict cooling
airflow. Use pressurized air or water to clean.

DO NOT use any tool, like a s crewdriver 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.

57

Maintenance Instructions CLEANING

NOTE: Directing pressurized air or water from
the fan side of the radiator outward is recom­mended to dislodge material packed on the out­side of the cooling fins. DO NOT use cold water
on a hot radiator.

WARNING

Radiator and engin e part s can be come ex­tremely hot during operation. Wear gloves
and avoid touching hot parts while clean­ing the radiator screen and cleaning de­bris away from the engine and cooling
system.

Flushing Radiator and Changing Coolant

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

1. Remove the radiator cap.

2. Open the drain cocks on the engine blo ck and
radiator (see the Kubota Owner’s Manual for lo­cation of the drain cocks). Also, drain the cool­ant recovery tank.

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
electrical plug on the fuel shut-off sole­noid.

1. Raise the dec k lock lever handle on e ach 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 posi tion and inser t the deck hook
into the tilt-up latch on the tractor body.

Tilt-Up Lift Handle

Tilt-Up Latch

Tilt-Up Latch

3. If there is any indication of deposits or scaling
inside the radiator, use a commerci al 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.

IMPORTANT: The solut ion of a ntifre eze 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 coola nt 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).

Tilt-Up Hook

on Deck

Deck Lock Lever

Deck Secured in TILT-UP Position

DANGER

Do not operate the mower with deck in tilt­up position. Do not move t he tra ctor 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 bafflin g and
housing.

58

Maintenance Instructions CLEANING

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.

GHS Blower

Normally, the GHS blower operates with no mainte­nance or cleanin g. However, when mowing grass
that is dirty and damp (especially spri ngtime mo w­ing), a deposit of dirt may accumulate inside the
blower housing, causing wear and binding of the
blower wheel. W hen op erati ng in thes e co ndi tio ns ,

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:

2. Use a pressure washer or water spray, and di­rect the spray inside the blower housing against
the blower blades. Water pressure will cause
the blower wheel to begin to spin and the com­bination of spinning ac tio n 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 thoro ugh washing action. Wash
blower until the blower wheel spins freely in
both directions.

3. Reinstall the GHS blower drive belt by reversing
the removal procedure.

Blower

Blower

Drive Pulley

GHS Blower

Drive Belt

Pulley

DANGER

Before attempting to wash the blower,
stop the engine, remove the ignition key,
and electrical plug on the fuel shut-off so­lenoid.

1. Remove the GHS blower drive belt tension by
depressing the idler pulley on the tightener arm.
Roll the belt off the blower pulley. The belt
should be cle ar of the blower pulley, allowing

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

er wheel must spin freely . Any bi nding 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).

Belt Tightener

Idler Pulley

Collapse Blower Belt Tightener

to Remove GHS Blower Drive Belt

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 t o
avoid overheating the transmission fluid and short­ening transmissi on life. The cooling fins shoul d 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 a bove.
Also, pay close attention to the area under the drive
pulley.

59

Maintenance Instructions

CLEANING/

CHECKING/SERVICING

IMPORTANT: In case an oil leak dev elops on the

input shaft, the cooling fan blowing du sty ai r and oil
on the transmission will quickly pack the cooling
fins with oily dirt. If this condition occ urs, replace
the seal immediately to avoid overheating and dam­aging the transm ission. The in put shaft assembly
and seal are easily re placed without removing the
transmission from the machi ne.

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

Cooling Fan

Cooling Fins

Engine Cooling System

Coolant Level

WARNING

NEVER remove the radiator p ress ur e ca p
when the engine is hot — hot water could
spray and cause a burn if the cap is taken
off too soon.

Check the cool ant le vel in the co olan t reco very t a nk
and maintain the coolant level between 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.

If the coolant level is low, remove the radiator cap
and fill to the overflow por t level and then fil l the re­covery tank above the LOW mark. Use a pre-mixe d
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 (addi ng pure antifreeze
into the radiator may cause damage to the engine by
causing overheating).

Hydrostatic Transmission Cooling Fins

CHECKING/SERVICING

DANGER

To prevent accidental starting of the en­gine when servicing or adjusting the ma­chine, remove the key from the ignition
switch and disconnect the electric plug on
the fuel shut-off solenoid.

Fan Belt Tension

Check and adjust the fa n belt tens ion to avo id en­gine overheating and insufficient battery charg­ing. Push on the belt in the middle of the span

between the alternator and cranks haft. If properly
tensioned, it sho uld deflect about 0.4 in. (10 mm).
Also check the belt for cracks or deterioration.

Fan Belt

0.4 in. (10 mm)
Deflection

60

Fan Belt Tension

Maintenance Instructions CHECKING/SERVICING

Security of Air Filtration Components
NOTE: The fol lowing inspection is only an ex ter-

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 Radia lseal™ air cleaner
canister for damage . Make su re the co ver is in
place and the cover latches are secure - do not
run the engine withou t the air cleaner c over in
place and secure.

2. Inspect the air intake hose for cracks, nicks,
cuts, etc., and check the ho se c lam ps fo r tig ht­ness.

Battery
NOTE: Fo r initial battery se rvice during setup, r e-

fer to Battery Service in Asse mbly 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 severe dam­age to the machine. A haz ard may be created by
damage to critical working parts and safety systems.

Electrolyte Level

The battery electr olyte leve l should be c hecked af­ter every 25 hours of operation. To check el ectr o-

lyte level:

1. Remove battery cell filler caps.

Cleaning the Terminals

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

Chargin g the Battery

Check the bat t er y ch ar ge by me as u rin g th e s pec i fic
gravity of electroly te; if specific gravity is less than

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

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. Afte r chargi ng the batte ry, use drinking water to
adjust the electrolyte leve l 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-ven tilated

area, so that gases produced while charg­ing can dissipate.

• Keep sparks, flames, and smoking ma-

terials away from the battery at all times.

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.
IMPORTANT: DO NOT overfill the battery.

Electrolyte will overflow through the vented caps
onto parts of the machine and WILL result in se­vere corrosion.

• Make sure the battery cap vents are open

(check manifold vent on each cap).

• Make sure the battery charger is un-

plugged before connecting or discon­necting cables to the battery.

Tire Pressure

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

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

61

Maintenance Instructions CHECKING/SERVICING

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 ty pe grass or oper ating on sandy
soils). Replace blades if worn, bent, c rac ked, or

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

following procedure to check and sharpen blades:

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 electrical plu g on the fuel shut-off
solenoid 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.

4. If the blade cutting edge is dull or nic ked, it
should be sharpened. Remove blades for
sharpening by grasping the end of the blade 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 e lectric grind­er, or a hand file.

CAUTION

ALWAYS wear eye protection and gloves
when sharpening a blade.

Sharpen at

Original 30° Angle

Intersection

Wear Area

DANGER

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

3. Check the blades for straightness by marking
the blade tip position insi de the deck housing,
and then rotating the opposite en d of the bl ad e
to the same position and com paring. If the dif­ference in blade tip tra ck is more than 1/8 in.

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

WARNING

DO NOT try to straigh ten a blade that is
bent. NEVER weld a broken or cr acked
blade. ALWAYS replace with a new blade
to assure safety.

30°

Do Not Grind or

Sharpen on Underside

Mower Blade Profile For Sharpening

6. Check blade balanc e by positioning the bl ade
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 bal anced w hen
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.

Wing

Tip

62

Maintenance Instructions CHECKING/SERVICING

Fuel Lines and Clamps
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.

Blade Balancer

Blade Balanced on Magnetic

Wall-Mounted Balancer

7. Mount the blade with w ing tips poin ting up int o
the housing. Reins tall the blade, wa sher, lock
washer, and nut. Tighten the nut to 60 ft-lb

(81.3 N·m).

NOTE: When reinstalling b lades on GHS models,

remember, the blades turn toward each other
(counter-rotate) and the RH and LH blade cannot be
switched. Check for proper blade rotation before in­stalling blades on the deck. Refer to Blade Rota-

tion for GHS Mower Deck illustration shown in
Clogging Checklist in Operating Instructions for

correct blade rotation.

Drive Belts

Raise the body and inspect the cond iti on of the five
(5) belts (4 belts on SD models) every 25 hours of
operation - engine PTO drive, jackshaft drive, hydro­static ground drive, GHS blower drive, and engine
fan belt. If the belts show signs of cracking or de-

teriorating, the belts should be replaced. Refer to
REPLACING/REPAIRING the Drive Belts in this

section.

Mower Deck Gearbox Oil Seals

The mower deck gearbox seals should be inspected

every 25 hours for evidence of oil leaking; particu­larly 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 r e­moved 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.

NOTE: This proced ure is o f speci al im portance for

the diesel engine due to poor performance when air
is injected with the fuel.

Radiator Hoses and Clamps

Inspect the radiator ho se s 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 br ake (and
blower brake on GHS models) by engaging the
blade clutch (PTO), operating the engine at full throt­tle, then disengaging the clutch and measuring how
quickly the blades s top. Watch the rotation of the
blade drive shaft and bl owe r pul le y a s a v isual i ndi ­cation that movement has s topped. If the brake is

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

brake system malfunc tions - blades do not stop in
five (5) seconds - adjust or repair the brake before
operating the mower. Contact your Walker Dealer.

63

Maintenance Instructions REPLACING/REPAIRING

REPLACING/REPAIRING

DANGER

To prevent accidental starting of the en­gine when replacing parts or repa iring the
machine, remove the key from the ignition
switch and disconnect the electrical plug
on the fuel shut-off solenoid.

IMPORTANT: ALWAYS use genuine factory re-

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

Jackshaft
Drive Belt

Drive Belts

There are five (5) individual belts on GHS models
or four (4) belts on SD models:

• Engine PTO Drive Belt (3 Groove Power Band)

• Jackshaft Drive Belt

• GHS Blower Drive Belt (GHS Model Only)

• Hydrostatic Ground Drive Belt

• Engine Fan Belt

The belts may be removed and re placed using the

procedures described on the following pages.

Engine

PTO Belt

Engine

Fan Belt

Hydrostatic Ground

Drive Belt

GHS Blower Belt

(GHS Model Only)

Belt Locations

64

Maintenance Instructions REPLACING/REPAIRING

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 (b y pus hin g down o n col d start
lever) 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. Loosen the brake band adjustment nut to

allow the clutch idler pulley to drop down
against the frame. This provides maxi­mum looseness of the belt to assist
removal.

Pull UP to Engage

c. Remove the PTO drive belt by “walking”

the belt off of the e ngine and PTO pull eys
one groove at a time until the bel t is com­pletely removed.

2. Install the PTO drive belt by reversing th e re­moval procedure. Check and make the
following adjustments:

a. Adjust clutch di sengagement (brake band

adjustment) and check brake action.

b. Adjust clutch engagement for proper belt

tension.

Engine

Pulley

Blade Clutch Lever

in the UP Position

Engine

PTO Belt

Clutch

Linkage

Brake

Band

PTO Drive

Pulley

Engine PTO Drive Belt Removal

Clutch Idler

Pulley

PTO Bel t

Tightener Arm

65

Maintenance Instructions REPLACING/REPAIRING

Jackshaft Drive Belt

b. Slide the idler arm releas e down to unlock

1. To remove the jackshaft drive belt:
a. Relax the belt by re leasing spring tensio n

from the jackshaft drive idler arm using the

cold start lever.

the idler arm from t he spring lever. Then
pivot the arm up and away from the belt.

c. Roll the belt off the jackshaft pulley and

remove.

Idler Arm

Release

Jackshaft
Drive Belt

Jackshaft

Pulley

Ground Drive

Idler Pulley (Disengaged)

Jackshaft Drive Belt (Disengaged)

2. Reverse the removal procedure to replace the
jackshaft drive belt.

Idler Arm

Jackshaft

Drive Belt

Release

Cold Start Lever

(Released)

Spring Tension

(Released)

Engine Pulley

Cold Start Lever

(Engaged)

66

Jackshaft

Pulley

Ground Drive

Idler Pulley (Engaged)

Jackshaft Drive Belt (Engaged)

Spring Tension

(Engaged)

Engine Pulley

Maintenance Instructions REPLACING/REPAIRING

GHS Blower Drive Belt

1. Remove the GHS blower drive belt tension by
depressing the idler pulley on the tightener arm.
Roll the belt off the blower pulley. The belt
should be cle ar of the blower pulley, allowing
free movement of the blower wheel.

Blower Drive

Pulley

GHS Blower

Drive Belt

Belt Tightener

GHS Blower Drive Belt Assembly (Disengaged)

Blower Drive Belt Spring Removal

2. Reverse the procedure to install the GHS blow­er drive belt and spring.

Blower

Pulley

Idler Pulley

(Disengaged)

Idler Pulley

(Engaged)

GHS Blower Drive Belt Assembly (Engaged)

67

Maintenance Instructions REPLACING/REPAIRING

Hydrostatic Ground Drive Belt

1. To remove the hydrostatic ground drive belt:
a. Raise the spring-loade d belt tighten er arm

and idler pulley to relax belt.

Belt Tightener Arm

Hydrostatic

Ground Drive Belt

b. Slide belt off pulleys, then release the

idler.

Jackshaft

Spring

Transmission

Drive Pulley

Idler Pulley

Hydrostatic Ground Drive Belt Assembly (Disengaged)

2. Reverse the procedure to install the hydrostatic
ground drive belt.

Belt Tightener Arm

Hydrostatic

Ground Drive Belt

Spring

Idler Pulley

68

Hydrostatic Ground Drive Belt Assembly (Engaged)

Maintenance Instructions REPLACING/REPAIRING

Engine Fan Belt

1. To remove the fan belt:
a. Loosen the alternator mounting pivot bolt

and the alternator bracket tensioner bolt.

Engine

Fan Belt

Crankshaft

Pulley

b. Pivot the alternator as shown to rel ax and

remove belt.

Alternator

Bracket

Tensioner

Bolt

Alternator

Water P ump

Pulley

Engine Fan Belt (Loose)

2. Reverse the proce dure to install the belt. Ad­just and check the belt tension by referring to
CHECKING/SERVICING the Fan Belt Tension
in this section.

Engine

Fan Belt

Crankshaft

Pulley

Engine Fan Belt (Tight)

Alternator

Bracket

Tensioner

Bolt

Alternator

Water Pump

Pulley

69

Maintenance Instructions REPLACING/REPAIRING

Fuel Filter

Model MDD has two (2) fuel filters. Replace both
the in-line filte r and th e Kub ota filter elemen t every
400 hours of operation.

Kubota

Fuel Filter

In-Line

Filter

IMPORTANT: Replace fuel filters only in a
clean area where the fuel line and connections
will not be contaminated by dust and dirt.

1. Close the fuel tank shut-off valve and the Kubota
fuel filter cock.

2. Remove and replace the in-line filter; expand
and slide clamps on either side of the filter away
from filter and pull fuel lines off filter.

Cold Start Lever
(For Reference)

Fuel Filter Location

Blade Overload Shear Bolts
NOTE: Shear bolts are not used on the DSD62

mower deck.
The cutting blade i s key ed to th e b lade hub by two

(2) shear bolts (10-24 x 5/8 in. stainless steel ma­chine screws). T hese bolts are des igned to shear
and protect the blade drive gearbox from damage if
the blade encounters a shock load.

Cutting Blade

Shear Bolts

Cutting Blade Shear Bolts

NOTE: Tightening the 5/8-18 blade mounting nut
to 60 ft-lb (81.3 N·m) is also important for proper
shock load protection . It is important to not over­tighten the mounting nut since thi s defeats (over-

rides) the function of the shear bolts.

70

3. Loosen the ring screw on the Kubo ta filter as­sembly, remove the filter pot and filter element.

4. Clean the filter pot and reassemble the filter as­sembly with a new filter element (use only a
Kubota replacement filter #15231-43560).

5. Open the fuel filter cock an d fuel tank shut-off
valve.

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 bl ade, check blade timing by
moving blades throu gh one (1) complete revolu-
tion. Make sure blade tips pass clear of each other.
If timing is incorrect, contact your Walker Dealer.

Maintenance Instructions REPLACING/REPAIRING

PTO Shear Pin

The PTO drive shaft connection to the deck gearbox
has a shear pin to pro vide shock l oad protecti on 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 sh eared, use the followin g
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 s hear pin fragment) in
the shaft. Use a punch to drive the rem aining
portion of the old shear pin out.

3. Install new shear pin and secure with cotter pin.

Mower Blades

Mower blades are remov ed and remounted as de­scribed in Sharpen Mower Blades instructions (re­fer to CHECKING/SERVICING in this section).
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 rea sons of s afety an d performan ce of

the machine:

• An ex cessive amount of the flat secti on of the

blade has been ground away (remov ed) when the
blade is sharpene d. Replace the blade when l ess
than a 3/4 in. (19 mm) flat section remains at the
blade tip.

• Exam ine ends of the blade carefully, especiall y

the intersection where th e flat section of the bl ade
turns up to form the “wing tip” (refer to CHECKING/

SERVICING for Mower Blade Profile for Sharpen­ing illustration in Sharpen Mower Blades instruc-

tions). Since sand and abrasive material can wea r
metal away in this area, the blade should be re-

placed when metal thickness has worn to 1/16 in.
(1.6 mm) or less.

Shear Pin

Split Spring Pin

U-Joint

Tube Assembly

U-Joint

Shaft Assembly

Cotter Pin

PTO Shear Pin

IMPORTANT: Use only Walker P/N 8067-13

shear pins for replacement to provide proper
shock protection -- these pins are hardened to
shear under a specific amount of load.

4. Reinstall the PTO shaft guard.

Before operating the deck, inspect t he 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.

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 se rious potential for
injury or damage.

• Check the blades for straightness by marking

blade tip position inside the deck ho using and t hen
rotating the opposite en d 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.

• Inspect the blade surface, especially in formed ar-

eas, for cracks. Replace the blade if any cr acks 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.

71

Maintenance Instructions

REPLACING/REPAIRING/

ADJUSTMENTS

Reinstall the blades following procedure from

Sharpen Mower Blades instructions in CHECKING/
SERVICING in this section. If blades are replaced,

always use Walker original equipment blades to
ensure safety and optimum performance. The
quality and performance of replacement blades
offered by other manufacturers cannot be
guaranteed, they could be dangerous.

CAUTION

ALW A YS use genuine factory replacement
part s. Substitute parts CAN result in prod­uct malfunction and possible injury to the
operator.

ADJUSTMENTS
Steering Levers

An adjustment ran ge of approximately 3 inches is
available on the steering lev ers - the levers can be
adjusted forward or aft depending on the arm length
of the operator. The levers can be adjusted by loos­ening the locknu t at the pivot p oint and the lo cknut
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 l evers shou ld move in and out of
the engaged and disenga ged positions freely. All
four hitch pins used for height adjustment should sit
flush on the washers above the deck pin bushing.
On a level surface, if any pin is sticking up (likely the
front pins), tighten the opposite side or loosen the ex­isting side to lower the pi n. Adjustment s are made by
loosening the jam nut and tightening or loosening the
set screws on the Deck Mount Pivot Brack ets. Re­tighten the jam nut when the adjustment is complete.

Jam Nut

Set Screw

Tilt-Up Deck Adjustable Stop

Adjustment

Slide

Locknut

(Position)

Locknut

(Pivot Point)

Steering Lever Adjustment

GHS Signal Horn Adjustment (When Horn Sounds at Wrong Time)

DANGER

PINCH POINT - SPRING LOADED DOOR

When lowering the door on the GHS
catcher, depress the safety latch on the
side of the catcher. BE VERY CAREFUL to
keep hands, fingers, etc. out of the hing­ing mechanism and away from the door
frame as the door closes. The springs that
hold the door closed during operation are
very powerful, and the door can slam shut
with considerable force.

®

The vertical position of the Grass-Pak
ical to make sure the catche r box does not overfill
causing the delivery chute to clog. The vert ical po­sition can be adjusted by bending the mounting
bracket for the Grass-Pak

®

switch.

switch is crit-

72

Maintenance Instructions ADJUSTMENTS

1. Position the dis charge ch ute so t hat 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 bystanders or
property damage.

2. Measure from the exhaust screen (top of catch­er) to the top of the Grass-Pak
vane, as shown. The proper measurement
should be betwe en 4 and 4-1/2 inches (1 0.16
and 11.43 cm).

®

switch actuator

3. If adjustment is require d, hold the Grass-Pa k
switch mount bracket firmly, grasp the switch
and bracket and bend it down. Adjustments
should be done in very small increments 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 th e switch t o
give a signal at the precise instant the catcher is full
for a wide variety o f mow ing co ndi tio ns . F or ex am ­ple, wet heavy grass will fill the catcher differently
than dry fluffy grass, caus ing the s ignal to com e 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).

®

Bend
Point

Adjusting the Grass-Pak

(Side view of Catcher Box)

Exhaust

Screen

4 to 4-1/2 in.

®

Switch

73

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74

LIMITED W ARRANTY

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 p art 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. WALKER 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 wa rranty sh all apply and no dealer, distributor, or individual is authorized

to amend, modify, or extend this warranty in any way. Accordingly, additional statements such as dea ler 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.

75

Lwa

105

LpA

93

OPERATOR

Sound - Model MDD

Sound Test

Sound test conducted was in accordance
with 79/113/EEC and was performed on 28
January 98 under the conditions listed:

General Condition: Cloudy

o

Temperature: 32 (F)
Wind Speed: < 5 mph (< 8 kmh)
Humidity: 58%
Ba r o met r i c P r e ssu r e : 2 5 . 0" H G ( 63 6 m m Hg )

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Vibration - Model MDD

Vibration Level

Vibration levels at the operators handles

0.8g

were measured in the vertical, lateral, and
longitudinal directions using calibrated vibra­tion test equipment.

Tests were performed on 28 January 98
under the conditions listed:

General Condition: Cloudy

o

Temperature: 32 (F)
Wind Speed: < 5 mph (< 8 kmh)
Humidity: 58%
Barometric Pres sure: 25.0" HG (636 mm Hg)

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