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 (970) 221-5614,
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 (970) 221-5614.
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
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