Walker D21d User manual

Please Read and Save These Instructions
For Safety, Read All Safety and Operation
Instructions Prior to Operating Machine
Operator’s Manual
Safety, Assembly, Operating, and Maintenance Instructions
Beginning S/N: 170133
P/N 7000-22

Foreword
Thank you. . .for purchasing a Walker mower. Every e󰀨ort has been made to provide you with
the most reliable mower on the market, and we are sure you will be among our many satised
customers. If for any reason this product does not perform to your expectations, please contact
your local dealer. Every customer is important to us. Your satisfaction is our goal.
Please. . .read this manual thoroughly! This manual is to be used in conjunction with the engine
manufacturer’s manual for the specic 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 contact your local authorized
dealer or call our service department, at [phone], for clarication before operating or
servicing this mower.
This manual covers Model D21d 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.
Specications given are based on the latest information available at the time this manual was
produced for a tractor with standard equipment. Optional equipment is available and may a󰀨ect
the standard specications listed.
Walker Mfg. Co. is continually striving to improve the design and performance of its products. We
reserve the right to make changes in specications and design without thereby incurring any
obligation relative to previously manufactured products.
Sincerely,
WALKER MANUFACTURING COMPANY
Bob Walker, Chairman

D21d 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 Compo-
nents.....................................................................2
Specications ......................................................3
Component Identication ...................................7
Safety Instructions 11
Before Operating ...............................................11
Operating............................................................13
Maintenance.......................................................15
Safety, Control, and Instruction Decals...........16
Assembly Instructions 20
Setup Instructions.............................................20
Tire Installation (Tractor) ...........................................20
Battery Service..........................................................20
Battery Charging ...................................................20
Battery Installation.................................................21
Mower Deck Assembly..............................................21
Deck Caster Wheels Installation ...........................21
Deck Discharge Chute Installation ........................21
Deck Discharge Deector
Shield Installation ..................................................22
PTO Shaft Guard Installation ................................22
Tilt-Up Roller Wheel Installation............................22
Mower Deck Installation on Tractor...........................22
Deck Installation....................................................22
Deck Leveling........................................................25
DS60-3 Deck Leveling...........................................26
Measuring Deck Levelness ...........................26
Deck Leveling Procedure..............................26
Preoperating Checklist .....................................27
Operating Instructions 30
Control Identication,
Location, and Function ....................................30
Operating Controls....................................................30
Engine Throttle......................................................30
Forward Speed Control (FSC)...............................31
Steering Levers .....................................................31
Blade Clutch (PTO) ...............................................31
Parking Brake........................................................31
Front Body Latch Release.....................................33
Transmission Lockout Levers................................33
Cold Start Lever (Jackshaft Drive Belt Release)...33
Suspension Seat ...................................................34
Instrument Panel.......................................................36
Hourmeter .............................................................37
Voltmeter ..............................................................37
Water Temperature Gauge....................................37
Oil Pressure Warning Light/Horn...........................37
Water Temperature Warning Light/Horn................38
Ignition Switch .......................................................38
Light Switch (For Optional Lights) .........................38
Warning Horn ........................................................38
Circuit Breakers.....................................................38
Starting the Engine............................................39
Adjusting Ground Speed and Steering ...........40
Engaging the Blade Drive.................................42
Stopping the Machine .......................................43
Adjusting Cutting Height ..................................44
DS60-3 Cutting Height..............................................44
DS60-3 Transport Position........................................44
Transmission Lockout ......................................45
Recommendations for Mowing ........................45
Recommendations for Towing .........................47
Recommendations for Tilt-Up Deck
Operation/Transport..........................................47
Grass Handling System (GHS).........................48
General Information ..................................................49
Clogging Checklist ....................................................50
Using the Tilt-Up Deck ..............................................51
Using the GHS Catcher ............................................51
Powerl ®...............................................................51
“Full” Signal Horn ..................................................51
Cleaning the GHS Exhaust Screen...........................52
Dumping the Catcher................................................52
Tailgate Dumping ..................................................52
Using the Dump Bag .............................................53
Power Dump Option..............................................54
Hi-Dump®Option ...................................................54

Table of Contents D21d
Maintenance Instructions 58
Maintenance Schedule Chart ...........................58
Important Tips for Care of the
Kubota Engine ...................................................59
Fuel System..............................................................59
Starting/Stopping ......................................................59
Cooling System.........................................................59
Air Cleaner System...................................................59
Oil..............................................................................59
Lubrication.........................................................60
Engine Oil .................................................................60
Engine Break-In Oil ...............................................60
Checking Engine Crankcase Oil Level..................60
Changing Engine Crankcase Oil/Oil Filter.............60
Mower Deck Gearbox Lubrication.............................62
DS52 Mower Deck Lubrication .................................62
Mower Deck Spindle Lubrication ..............................63
Tractor PTO Gearbox Lubrication.............................63
Checking Gearbox Oil Level..................................63
Changing Gearbox Oil...........................................63
Gear Axle Lubrication................................................63
Hydrostatic Transmission Oil ....................................64
Extending the Warranty.........................................64
Checking Hydrostatic Transmission Oil Level .......64
Changing Hydrostatic
Transmission Oil and Filter....................................64
Grease Fitting and Oil Point Lubrication ..................65
Cleaning .............................................................68
Engine Air Cleaner System .......................................68
Turbine Precleaner ................................................68
Donaldson Radialseal™ Air Cleaner.....................69
Engine Cooling System.............................................70
Radiator Screen and Cooling Fins ........................70
Flushing Radiator and Changing Coolant .............71
Grass Buildup in Mower Deck Housing ....................71
GHS Blower ..............................................................72
GHS Exhaust Screen................................................72
Hydrostatic Transmission Cooling Fins.....................73
Checking/Servicing ...........................................73
Engine Cooling System.............................................73
Coolant Level ........................................................73
Alternator Belt Tension ..........................................74
Security of Air Filtration Components........................74
Battery.......................................................................74
Cleaning the Terminals..........................................74
Charging the Battery .............................................75
Tire Pressure ............................................................75
Wheel Bolt Torque.....................................................75
Sharpen Mower Blades.............................................75
Drive Belts.................................................................76
Mower Deck Gearbox Oil Seals................................76
Fuel Lines and Clamps .............................................76
Radiator Hoses and Clamps.....................................77
Engine Valve Clearance............................................77
Fuel Injection Nozzle Pressure .................................77
Transmission Control Setting....................................77
Neutral-Park ..........................................................77
Straight Ground Tracking ......................................77
Blade Brake Action....................................................77
PTO U-Joints ............................................................78
Safety Switch System ...............................................78
Forward Speed Control Friction Lock .......................78
Replacing/Repairing..........................................79
Drive Belts.................................................................79
Engine PTO Drive Belt ..........................................80
Jackshaft Drive Belt...............................................81
GHS Blower Drive Belt..........................................82
Hydrostatic Ground Drive Belt...............................83
Engine Alternator Belt ..........................................84
Deck Drive Belt (Optional DS60-3 Deck)..................85
Fuel Filter .................................................................86
Blade Overload Shear Bolts......................................86
Mower Blades ...........................................................87
Adjustments.......................................................88
Transmission Control ................................................88
Steering Lever Position Adjustment ......................88
Set FSC Travel Limits (Stop).................................88
Set Maximum Forward Travel Speed (Stop) .........89
Neutral Function Adjustment .................................89
Straight Ground Travel Adjustment .......................90
Blade Clutch (PTO)...................................................91
Clutch Engagement/Belt Tension ..........................91
Clutch Disengagement/Brake Action.....................91
Forward Speed Control Friction Lock .......................92
Steering Handles ......................................................93
Tilt-Up Deck Adjustable Stop ....................................93
GHS “Full” Signal Horn Adjustment ..........................94

D21d General Information
1
General Information
HIGHLIGHTED INFORMATION
Walker Manufacturing recommends that any ser-
vice requiring special training or tools be performed
by an authorized Walker Mower dealer. There are
several general practices to be aware of in the
area of safety. Most accidents associated with the
operation or maintenance of a Walker Mower are
caused by disregarding basic safety precautions or
specic warnings. Such accidents, in most cases,
can be prevented by being aware of the dangers
present.
Information of special importance has been high-
lighted in bold type in this manual. Refer to Safety
Instructions on page 11 for the meanings of
DANGER, WARNING, CAUTION, IMPORTANT,
and NOTE.
GLOSSARY
There are many terms that are either unique to this
equipment or that are used as acronyms. The
following terms and their denitions 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, belt or gear drive
components, and cutter blades.
●FORWARD SPEED CONTROL (FSC) controls
the maximum forward speed of the tractor;
functioning as a cruise control.
●GRASS HANDLING SYSTEM (GHS®) collects
mowed material and deposits it in the catcher.
●GRASS-PAK®SWITCH is mounted on the
grass delivery spout (in the catcher) and
activates the “full” signal horn when the grass
catcher is full.
●GROUND DRIVE refers to the dual hydrostatic
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 operator is seated
facing forward in the tractor seat.
●POWER TAKE-OFF (PTO) transmits engine
power to run the cutter blades and GHS
blower.
●POWERFIL® spreads the mowed material
throughout the interior of the grass catcher by
an oscillating delivery spout.
●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) discharges mowed
material from the right side of the mower deck.
●STEERING LEVERS steer the tractor by
controlling the dual hydrostatic transmissions.
●TRACTOR is the prime mover, including the
engine, drivetrain, operator seat, and controls
to operate the mower.
●TRANSMISSION LOCKOUT releases the
hydrostatic transmissions to permit freewheel-
ing the tractor.
IDENTIFYING NUMBER LOCATIONS
The tractor serial number plate is a󰀩xed to the
tractor body just below the left rear corner of the
seat. The mower deck serial number plate is
a󰀩xed alongside the angle iron framing on the LH
side of the LH mower blade drive. Model and
serial numbers are helpful when obtaining replace-
ment parts and maintenance assistance. For
ready reference, please record these numbers in
the space provided.
Tractor Model No. ______________________
Tractor Serial No. ______________________
Deck Serial No. ______________________
Engine Model No. ______________________
Engine Serial No. ______________________
Date of Purchase ______________________
Fill In By Purchaser

General Information D21d
2
Serial Number
Tractor Serial Number Location
Serial Number
Mower Deck Serial Number Location
ENGINE SERIAL NUMBER LOCATION
Refer to the engine manual that accompanies this
manual or photo below for the location of the
engine serial number.
Serial Number
Engine Serial Number Location
SERVICING OF ENGINE AND DRIVE-
TRAIN COMPONENTS
The detailed servicing and repair of the engine,
hydrostatic transmission, and gearboxes are not
covered in this manual. Only routine maintenance
and general service instructions are provided. For
the service of these components during the limited
warranty period, it is important to nd a local,
authorized servicing agent of the component man-
ufacturer. Any unauthorized work done on these
components during the warranty period may void
the warranty. If you have any di󰀩culty nding an
authorized outlet or obtaining warranty service,
please contact our Service Department for assis-
tance:
Walker Manufacturing Company
5925 E. Harmony Road
Fort Collins, CO 80528
1-970-221-5614
www.walker.com
Service manuals are available for each of these
components from their respective manufacturers
as follows:
Kubota Engines Kubota Engine
America Corp.
505 Schelter Rd
Lincolnshire, IL 60069
Hydrostatic
Transmissions
Danfoss Power Solutions
14615 Lone Oak Road
Eden Prairie, MN 55344 USA
952-937-9800
www.danfoss.com
Gearboxes (Deck) Peerless Gear
1555 South Jackson St.
Salem, IN 47167 USA
866-536-8310
www.peerlessgear.com

D21d Specications
3
SPECIFICATIONS
ENGINE
Manufacturer/Model Kubota D722, 3 Cyl., Diesel (Liquid-Cooled)
Displacement cu. in. (cc) 43.9 (719)
Max. Power HP (kW) 20.9 (15.6) @ 3600 RPM
Governed RPM 3600
Max. Torque lb·ft (N·m) 34 (46.1)
Idle RPM 1000
Crankcase Capacity qt (L) 3.4 (3.2)
Crankcase Lubricant API CF or Higher Grade Oil Only with 10W-30 or 15W-40 Viscosity
Above 14° F (-10° C) or 10W-30 Below 14° F (-10° C)
Oil Filter Kubota P/N HH150-32430
Cooling System Capacity gal (L)
(Approx.)
1.25 (4.74)
Cooling Fan Electric Radiator Cooling Fan with Reversible Self-Cleaning Action
Coolant 50/50 Pre-Mix Antifreeze/Water
Fuel Tank Capacity gal (L) 4.7 (17.8)
Fuel Diesel Fuel 2-D
Air Cleaner Remote Mounted Donaldson RadialsealTM
(Walker P/N 5090-1 Primary/5090-3 Safety Filter)
ELECTRICAL SYSTEM
Battery 12 Volt, 350 CCA (Interstate SP-40)
Charging System 40 Amp Automotive Alternator
Charging Output 40 Amp DC (Regulated)
System Polarity Negative Ground
Ignition Diesel with Glow Plugs
Starter 12 Volt Electric Key and Solenoid Operated
Interlock Switches Ignition Lockout by Seat Switch, Transmission Neutral,
Blade Clutch, and Parking Brake
Circuit Breakers Auto Reset (40A) - Electric System
Auto Reset (30A) - Radiator Fan Circuit
Manual Reset (10A) - Instrument Panel
Manual Reset (7A) - Instrument Panel
TRANSMISSION
Manufacturer/Model Dual Hydrostatic, Danfoss 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

Specications D21d
4
TRANSMISSION (continued)
Service Brake Dynamic Braking through Hydrostatic Transmission(s)
Parking Brake Mechanical Pin Lock in Transmission Gear
Neutral Transmission Release by Manual Dump Valve
Hydrostatic Transmission Oil
Transmission Oil Filtration Walker Transmission Oil Performance System (TOPSTM)
Factory Service Mobil SHCTM 630, Walker P/N 6450-20
Transmission Filter Walker P/N 5024-13
Transmission Oil Capacity  oz (L) 80 (2.4)
Transmission Cooling Cooling Fan Mounted on Drive Pulley
Final Drive Oil (Gear Axle)
Final Drive Gear Drive Axle
Factory Service SAE E.P. 80W-90 (API GL-5) Gear Lube
Final Drive Oil Capacity  oz (L) 24 (0.71)
Ground Travel Speed
Forward MPH (km/h)
Reverse MPH (km/h)
0-7 (0-11) Innitely Variable
0-5 (0-8) Innitely Variable
BLADE DRIVE
PTO Shaft Quick Disconnect Sliding Spline Shaft with Two (2) High-Speed
U-Joints
Blade Drive Clutch and Brake Manual Belt Tightener Clutch and Band Brake
[Stops Blades within Five (5) Seconds of Disengagement]
TIRE SIZE
Deck Caster Wheel 8 x 3.00-4 Semi-Pneumatic (Standard)
8 x 3.00-4 Pneumatic 4-Ply (Optional)
11 x 4.00-5 (Pneumatic 6-Ply, DS52, DS60, DS74 Only)
Drive 18 x 9.50-8 (Pneumatic 4-Ply, Standard)
18 x 10.50-10 (Pneumatic 4-Ply, Optional Low-Prole)
Tailwheel 13 x 4.50-6 (Pneumatic 6-Ply, Standard Dual)
13 x 8.00-6 (Pneumatic 4-Ply, Optional Single)
TIRE PRESSURE PSI (KPA)
Deck Caster Wheel* 20 (137)
Drive 15 (103)
Tailwheel 20 (137)
* If equipped with optional pneumatic tires

D21d Specications
5
DRIVE BELTS
Engine PTO Walker P/N 7230
Jackshaft Drive Walker P/N 6238
Ground Drive, Micro-V Walker P/N 7248-1
Blower (GHS Model) Walker P/N 7234-2
SEAT Full Spring Suspension with Dampening and Adjustments for Back
Angle, Lumbar Support, and Operator Weight. Standard with Ad-
justable/Retractable Armrests.
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 (High Impact Material,
UV Stabilized) for Chutes and Linear Low-Density Polyethylene For
Catcher
GHS SYSTEM (Optional)
Blower 10.5 in. Diameter, Three-Blade Paddle Wheel
Blower Brake Band Brake [Works in Combination with PTO Clutch, Stops
Blower within Five (5) Seconds of PTO Disengagement]
Max. Blower RPM 4000
Hi-Dump Option
Max. Lift Capacity lb (kg)
200 (91)
Grass Catcher Capacity
gal / bu / L
93 / 10 / 352
Full Signal (Grass-Pak® Switch) Oscillating Vane Switch Mounted on Grass Delivery Spout Triggers
Horn Signal
Powerl®Oscillating Delivery Spout Driven by 12 Volt Electric Gearmotor
Spreads Material throughout Interior of Catcher @ 35 Cycles/Min
MOWER DECK
Recommended Cut Width
Collection 42 to 52 in. (107 to 132 cm)
Side Discharge 42 to 74 in. (107 to 188 cm)
Mulch 42 to 52 in. (107 to 132 cm)
Cutting Height 1.5 to 4 in. (4 to 10 cm) or
1.5 to 4.5 in. (4 to 11.5 cm) (DS52 & DS60 Belt-Driven Decks Only)
Deck Suspension Independent Torsion-Flex Frame with Caster Wheels and
Counterweight Springs

Specications D21d
6
TOWING
Towing Capacity lb (kg) 250 (113) if equipped with a factory installed or factory authorized
tow hitch
DIMENSIONS (Tractor and Mower)
Length in. (cm)
Tractor Only 64.5 (164)
Tractor Wheel Base 41 (104)
Tractor with Tilted Deck
(Approximate)
77 (196)
Tractor with 48" Collection Deck
(DC48-1)
93 (236)
Width in. (cm)
Tractor Only (Outside Tire) 39 (99)
Tractor with 48" Collection Deck
(DC48-1)
49.25 (125)
Height in. (cm)
Tractor 50 (127)
Weight lb (kg)
NC Tractor Only 787 (357)
GHS Tractor Only 959 (435)
NC Tractor with 48" Side
Discharge Deck (DS48-1)
991 (450)
GHS Tractor with 48" Collection
Deck (DC48-1)
1178 (534)
NOTE: The manufacturer reserves the right to make changes in specications shown herein at any time
without notice or obligation. The specications listed are for a standard conguration tractor, and may
change with the addition of optional equipment.

D21d ComponentIdentication
7
Front View and Right Side View
COMPONENT IDENTIFICATION
NOTE: Operator Controls are identied in the sec-
tion Operating Controls on page 30.
Deck Caster Wheels
Anti-Scu󰀨
Roller
Grass Handling System
10.0 Bushel Catcher
Catcher Lift /
Dump Handle
Fuel Tank and Cap
Tilt-Up Hook
Tilt-Up
Deck Handle
Deck Support Pins and
Height Adjustment
Hitch Pins
Counterweight Spring
and Protective Cover
Spring Clip
Tilt-Up
Latch
Turbine
Precleaner
Transmission Control Rod
Adjustment Nut (LH)
Transmission Control Rod
Adjustment Nut (RH)
Deck Lift Handle
(Cutting Height Adjustment)
Deck Support Arm
Footrests

Component Identication D21d
8
Rear View and Left Side View
Left Hand
Drive Wheel
Radiator
Guard
Instrument Panel Box
(Shock Mounted)
Catcher
Door
Removable Grass
Catcher Screen
(Not Visible)
Catcher
Air Exhaust
Catcher
Door Handle
Dump Flap
Anti-Scu󰀨
Roller
Coolant
Recovery Tank
Tailwheel Fork
and Wheels
Radiator
Screen
Instrument Panel
Guard
Radiator Cap
Catcher Lift /
Dump Handle
Radiator
Catcher Door
Gas Spring
(Not Visible)
Gas Spring
Cover
Fuel Filter
(Not Visible)
Mu󰀪er and
Tailpipe

D21d ComponentIdentication
9
Top View (Engine Compartment)
Mu󰀪er Overow Hose
Radiator Cap
Radiator
Tailpipe
GHS Blower
Engine Dipstick
(Not Visible)
RH Hydrostatic
Transmission
Donaldson
Air Cleaner
Jackshaft
PTO Gearbox
Dipstick
Precleaner Tube
Air Filter
Restriction Gauge
LH Transmission
Lockout Lever
LH Hydrostatic
Transmission
Battery
Neutral Safety
Switch
Negative (-)
Battery Cable
Positive (+)
Battery Cable
RH Steering Lever
Spring / Dampener
PTO
Clutch Lever
RH Transmission
Lockout Lever
Air Cleaner
Cover
Turbine
Precleaner
TOPSTM Oil
Reservoir
40 Amp
Circuit Breaker
30 Amp
Circuit Breaker
LH Steering Lever
Spring / Dampener

Component Identication D21d
10
Top View (Engine Compartment)
Radiator Fan
and Shield
Radiator Screen
(Removable)
Fan Motor
Water Pump
Glow Plug(s)
Alternator
Fuel Return
Line
Fuel
Gauge
Fuel Tank
Cap
Fuel Pickup
Line
Thermostat Housing
and Thermostat
Water Temperature
Gauge Sender
Exhaust
Manifold
Oil Fill
Cap
Starter Motor Below
(Not Visible)
Air Intake
Hose
Injection
Pump Throttle Control
Linkage Lever
Engine Stop Lever Linkage
(Fuel Shut-O󰀨 Valve)
Injectors

D21d Safety Instructions
11
Safety Instructions
Pay particular attention to any information labeled
DANGER, WARNING, CAUTION, IMPORTANT,
and NOTE in this manual.
When you see the Safety Alert Symbol ( ),
read, understand, and follow the instructions. Fail-
ure to comply with safety instructions may result in
personal injury.
The seriousness or degree of importance of each
type of information is dened as follows:
DANGER
An IMMEDIATE hazard that WILL result in
severe personal injury or DEATH, if warn-
ing is ignored and proper safety precau-
tions are not taken.
WARNING
A POTENTIAL hazard that COULD result in
severe personal injury or DEATH, if warn-
ing is ignored and proper safety precau-
tions are not taken.
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 safety pre-
cautions are not taken.
IMPORTANT: Identies mechanical information
demanding special attention, since it deals with the
possibility of damaging a part or parts of the
machine.
NOTE: Identies information worthy of special
attention.
Walker Manufacturing cannot predict every poten-
tially dangerous situation. Therefore, items labeled
as such in this manual do not cover all conceivable
situations. Any person using procedures, tools, or
control techniques not recommended by Walker
Manufacturing must take full responsibility for
safety.
The Walker Rider Lawnmower has been designed
with many safety features to protect the operator
from personal harm or injury. However, it is neces-
sary for the operator to use safe operating proce-
dures at all times. Failure to follow safety
instructions contained in this manual may
result in personal injury or damage to equip-
ment or property.
If you have any questions concerning setup, oper-
ation, 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
Operator’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 Operator’s Manuals are
available by sending the Model and Serial
Number to:
Walker Manufacturing Company
5925 East Harmony Road
Fort Collins, CO 80528
2. Never allow children to operate rider mow-
er. Do not allow adults to operate without
proper instruction.
3. Clear the area to be mowed of any foreign
objects which may be picked up and thrown
by cutter blades. Pick up all sticks, stones,
wire, and any other debris.
4. Keep everyone, especially children and 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 wear-
ing sandals, sneakers, tennis shoes, or similar
lightweight footwear. Wear substantial pro-
tective footwear.

Safety Instructions D21d
12
6. Do not wear loose tting 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 regu-
lations.
7. Prolonged exposure to loud noise can cause
impairment or loss of hearing. Operator hear-
ing protection is recommended; particularly
for continuous operation of the GHS Model
due to blower noise level. Wear a suitable
hearing protective device, such as earmu󰀨s 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 the engine cannot be started
unless the Forward Speed Control lever is in
the NEUTRAL-PARK position, the PTO clutch
is in the DISENGAGED position, and the Park-
ing Brake is in the ENGAGED position. Also,
the engine should stop if the operator lifts o󰀨
the seat with any one or more of these con-
trols in the operating position: (1) Forward
Speed Control (FSC) out of NEUTRAL-PARK,
(2) PTO Clutch ENGAGED, or (3) Parking
Brake DISENGAGED.
NOTE: There is a 1/2 second time delay
function on the seat switch to avoid engine
power interruption when driving over bumps.
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).
c. Keep matches, cigarettes, cigars, pipes,
open ames, or sparks away from the fuel
tank and fuel container.
d. Always ll the fuel tank outdoors using
care. Fill to about one inch from the top of
the tank. Use a funnel or spout to prevent
spilling.
e. Replace the machine fuel cap and con-
tainer cap securely and clean up any
spilled fuel before starting the engine.
11. Never attempt to make any adjustments
while the engine is running, except where
specically instructed to do so.
12. The electrical system battery contains sulfuric
acid. Avoid any contact with skin, eyes, and
clothing. Keep the battery and acid out of
reach of children.
WARNING
This product can expose you to chemicals
including Di-(2-ethylhexyl) phthalate which
is known to the State of California to cause
cancer, and Di-(2-ethylhexyl) phthalate,
which is known to the State of California
to cause birth defects or other reproduc-
tive harm. For more information go to
www.P65Warnings.ca.gov.

D21d Safety Instructions
13
OPERATING
1. Operate the mower only in daylight or in
good articial 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 mov-
ing and/or mower blades are operating. Nev-
er operate the tractor without a deck or
implement installed.
3. For a beginning operator, learn to steer (ma-
neuver) the tractor with a slow engine
speed before attempting any mowing op-
eration. Be aware that, with the front mount-
ed mower conguration, the back of the tractor
swings to the outside during turns.
DANGER
Do not mow around overhanging tree
branches or bushes at the same height as
the operator’s torso and head where inad-
vertent contact may cause injury.
4. Remember, for an emergency stop, the for-
ward motion of the tractor can always be
stopped by pulling the Forward Speed Control
(FSC) into the NEUTRAL-PARK position.
5. In case either of the transmission drive belts
break during operation, and if the machine is
on a slope, the machine will freewheel down
the slope. To maintain control, immediately
(1) Release the steering levers and simultane-
ously (2) Move the FSC to the NEUTRAL-
PARK position. When the machine is stopped
or moving slowly, engage the parking brake.
NOTE: The emergency stop procedure is
exactly the same procedure as used to nor-
mally stop and park this machine.
6. Disengage the blade clutch, put the FSC in the
NEUTRAL-PARK position, and engage the
Parking Brake before starting the engine (an
ignition interlock switch normally prevents
starting of the machine if these controls are in
the OPERATING position).
7. Do not operate machine if the operator
presence safety switch system is not work-
ing. Verify proper operation by having the
operator lift o󰀨 the seat with the engine run-
ning and moving three controls, one at a time;
(1) Move the FSC lever out of the NEUTRAL-
PARK position, (2) Engage the PTO Clutch,
and (3) Disengage the Parking Brake. Moving
any of these controls should stop the engine
after a 1/2 second delay.
8. Do not run the engine in a conned area
without adequate ventilation. Exhaust
fumes are hazardous and can be deadly.
9. Do not carry passengers - maximum seating
capacity is one (1) person.
10. Watch for holes, rocks, and roots in the terrain
and for other hidden hazards. When mowing
tall grass, mow higher than desired to expose
any hidden obstacles. Then, clean the area
and mow to the desired height.
11. Avoid sudden starts or stops. Before back-
ing the machine up, look to the rear to be sure
no one is behind the machine. Watch carefully
for tra󰀩c when crossing or working near road-
ways.
12. When moving forward, do not suddenly put
the tractor in reverse by rapidly pulling on the
steering levers, especially when going down-
hill, as this can lift the tractor tail wheel o󰀨 the
ground and set up a bucking motion due to
operator overcontrol. If bucking does occur,
immediately stop the bucking action by pulling
the Forward Speed Control (FSC) lever into
the NEUTRAL-PARK position.
13. Disengage the blade drive when transporting
the machine across drives, sidewalks, etc.
Never raise the mower deck while blades
are rotating.
DANGER
Do not mow or dump grass within 5 feet
(1.5 meters) of an embankment or retaining
wall with drop o󰀨.

Safety Instructions D21d
14
14. The maximum recommended slope operat-
ing angle is 15 degrees or 27% grade.
When operating the machine on a slope, re-
duce speed and use caution to start, stop, and
maneuver. To prevent tipping or loss of control
of the machine, avoid sharp turns or sudden
changes in direction. Do not operate the
machine on a slope greater than 15 de-
grees.
15. Never adjust cutting height with the engine
running. Before adjusting cutting height or
servicing, disengage the blade clutch (PTO),
engage parking brake, stop the engine, and
remove the ignition key. Wait for all movement
to stop before getting o󰀨 the seat.
NOTE: A blade/blower brake should normally
stop drive line rotation within ve (5) seconds
of disengaging the PTO clutch.
16. For side discharge mower decks, do not op-
erate with the grass deector shield re-
moved. Keep the deector in the lowest
possible position.
17. When using the tilt-up deck, observe the
following:
a. Do not move tractor with deck in tilt-up
position.
b. Never tilt body forward with deck in tilt-up
position.
18. For GHS equipped models, do not operate
the machine with the grass catcher in the
DUMP position or with the back door
OPEN. Dangerous projectiles may be thrown
out of the discharge chute or the back of the
grass catcher.
19. For GHS equipped models, use care when
closing the grass catcher door. Keep n-
gers and hands away from the hinge and
pinch points when the door is being closed.
Also, keep ngers and hands clear of the door
frame. The door may slam shut with consider-
able force.
CAUTION
Use leg muscles and rm footing when lift-
ing the catcher to dump; avoid bending at
the waist and using back muscles in order
to prevent back injury.
20. In case of a clogged or plugged mower
deck or GHS catching system:
a. Disengage the blade clutch (PTO), engage
the parking brake, and turn the engine o󰀨
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-o󰀨 solenoid.
d. Never place hands under the deck or in
the GHS blower - use a stick or similar tool
to remove clogged material.
21. If the cutting blades strike a solid object or the
machine begins to vibrate abnormally, imme-
diately disengage the blade clutch (PTO),
engage the parking brake, stop the engine,
and wait for all moving parts to stop. To
prevent accidental starting, disconnect the
electrical plug on the fuel shut-o󰀨 solenoid.
Thoroughly inspect the mower and repair any
damage before restarting the engine and
operating the mower. Make sure cutter blades
are in good condition and blade nuts are
torqued to 60 lb·ft (81 N·m) for gear-driven
decks, and blade bolts torqued to 70 lb·ft (95
N·m) for belt-driven decks.
22. Do not touch the engine or mu󰀪er while
the engine is running or immediately after
stop ping the engine. These areas may be hot
enough to cause serious burns.
23. Do not stop or park in or near dry grasses
or bushes when operating the mower. The
heat from the engine or mu󰀪er could ignite the
dry material.
24. Never remove the radiator pressure cap
when the engine is hot (hot water may spray
and cause burns).

D21d Safety Instructions
15
25. Do not use ether or any starting uid to
assist starting the engine in cold weather.
26. When leaving the machine unattended, disen-
gage the blade clutch (PTO), engage the
parking brake, stop the engine, and remove
the key.
27. When equipped with a factory installed hitch or
factory authorized hitch kit, do not exceed
recommended tow capacities. Do not tow
with the PTO clutch or mower blades en-
gaged, and do not allow people to ride in or
on towed trailers.
28. Use caution when towing on slopes, rough
terrain or when conditions limit traction. Do
not tow on slopes greater than 5 degrees
(9%).
MAINTENANCE
1. To prevent accidental starting of the engine
when servicing or adjusting the machine,
remove the key from the ignition switch and
disconnect the electrical plug on the fuel shut-
o󰀨 solenoid.
2. To reduce re hazards, keep the engine free
of grass, leaves, excessive grease, and dirt.
3. Keep all nuts, bolts, and screws tight to ensure
the machine is in a safe, working condition.
Check the blade mounting nuts frequently,
mak ing sure they are tight.
4. Perform only maintenance instructions
described in this manual. Unauthorized
maintenance operations or machine modica-
tions may result in unsafe operating condi-
tions.
5. If the engine must be running to perform a
main tenance adjustment, keep hands, feet,
and clothing away from moving parts. Do not
wear jewelry or loose clothing.
6. Always use the proper engine service man-
ual when working on the engine. Unauthor-
ized maintenance operations or modications
to the engine may result in unsafe operating
conditions.
7. Altering the equipment or engine in any man-
ner which adversely a󰀨ects its operation,
perfor mance, durability, or use will VOID the
warranty and may cause hazardous condi-
tions.
8. Never attempt to disconnect any safety devic-
es or defeat the purpose of these safety de-
vices.
9. Do not change the engine governor settings or
overspeed the engine. The governor has
been factory-set for maximum-safe engine
operating speed.
10. Use genuine factory replacement parts.
Sub stitute parts may result in product malfunc-
tion and possible injury to the operator and/or
others.
11. Use care when charging the battery or
per forming maintenance on the battery and
electrical system:
a. Make sure the battery charger is un-
plugged before connecting or disconnect-
ing cables to the battery.
b. Charge the battery in a well-ventilated
space, so gases produced while charging
can dissipate.
c. Keep sparks, ames, and smoking materi-
als away from the battery at all times. To
avoid sparks, use care when removing
bat tery cables from posts.
d. Disconnect both battery cables before
unplugging any wiring connectors or mak-
ing repairs on the electrical system.
12. Do not attempt to service the engine fuel injec-
tion system, which contains high pressure fuel
and may cause injury if mishandled. For ser-
vice of the pressurized fuel system, including
the fuel pump, fuel lines, and fuel injectors,
contact your Walker dealer or authorized
Kubota service dealer.
IMPORTANT: Keep all applicable manuals
immediately accessible to anyone who may
operate or service this machine.

Safety Instructions D21d
16
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.
1. 2.
2.
3.
1.
4.
5.
Location: RH Fender
Part Number: 8600-33
1. Warning – read Operator’s Manual before
servicing or performing maintenance.
● Engage parking brake.
● Remove ignition key.
2. Forward Speed Control
● Move lever forward to increase speed; back
to stop.
3. Warning – do not operate the machine without
a deck or other implement attached.
4. PTO Clutch Lever
● Move lever forward to disengage PTO
clutch; back to engage.
5. Warning – do not engage PTO clutch with PTO
shaft disconnected.
8600-4
1.
2.
Location: Adjacent to Blower Discharge
Chute through Body
Part Number: 8600-4
1. Warning - rotating impeller is a cutting/dismem-
berment hazard to ngers and hands.
● Never reach down into the blower
discharge chute.
2. Warning - thrown object hazard.
● Never engage the PTO with grass catcher
raised.
8600-16
Location: Rear Cross Member of Front Body
Part Number: 8600-16
Important - Lower front body before lowering
catcher box.
Location: Rear of Grass Catcher Exhaust Screen
Part Number: 5869