Walker Rider Lawnmowers MBS26 User manual

OWNER’S MANUAL
Safety, Assembly, Operating, and Maintenance Instructions
and ILLUSTRATED PARTS MANUAL
Model MBS26 (26 HP)
Model MBS (27 HP)
Please Read and Save These Instructions Effective Date: 09-15-10
For Safety, Read All Safety and Operation P/N 2000-2
Instructions Prior to Operating Machine
™
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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 satised custom ers.
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 prop-
er 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 MBS26 with Kohler CH26 (26 HP) Electronic Fuel Injection (EFI) gasoline
engine or optional Kohler Command CH740 (27 HP) gasoline engine.
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 pro-
duced.
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 obli-
gation relative to previously manufactured products.
Sincerely,
WALKER MANUFACTURING COMPANY
Bob Walker, President

Table of Contents
Owner’s Manual
General Information ________________ 1
HIGHLIGHTED INFORMATION _____________ 1
GLOSSARY ____________________________ 1
IDENTIFYING NUMBER LOCATIONS ________ 1
ENGINE SERIAL NUMBER LOCATION _______ 2
SERVICING OF ENGINE AND
DRIVETRAIN COMPONENTS ______________ 2
Specications ________________________ 3
Component Identication ___________ 6
Safety Instructions _________________ 10
BEFORE OPERATING ___________________ 10
OPERATING ___________________________ 11
MAINTENANCE ________________________ 13
SAFETY, CONTROL, AND
INSTRUCTION DECALS _________________ 14
Assembly Instructions ______________ 16
SETUP INSTRUCTIONS __________________ 16
Battery Service _______________________ 16
Wet Battery Service __________________ 16
Dry Battery Service ___________________ 16
Battery Charging _____________________ 17
Mower Deck Assembly _________________ 17
Deck Caster Wheels Installation _________ 17
Deck Discharge Shield Installation (DSD60) 18
PTO Shaft Guard Installation ___________ 18
Tilt-Up Roller Wheel Installation _________ 18
Mower Deck Installation on Tractor _______ 18
Deck Installation _____________________ 18
Deck Leveling _______________________ 21
PREOPERATING CHECKLIST _____________ 22
Operating Instructions _____________ 24
CONTROL IDENTIFICATION,
LOCATION, AND FUNCTION _____________ 24
Ignition Switch _______________________ 24
Engine Choke (Model MBS Only) ________ 25
Engine Throttle _______________________ 25
Body Latch __________________________ 25
Forward Speed Control (FSC) ___________ 25
Steering Levers_______________________ 26
Blade Clutch (PTO) ____________________ 26
Parking Brake ________________________ 26
Oil Pressure Warning Light _____________ 27
Engine Service Light (Model MBS26 Only) _ 27
Over Temperature Warning Light ________ 27
Transaxle Lockout Rods _______________ 28
Hourmeter ___________________________ 28
STARTING THE ENGINE _________________ 30
ADJUSTING GROUND
SPEED AND STEERING __________________ 30
ENGAGING THE MOWER ________________ 32
STOPPING THE MACHINE _______________ 33
FUEL SELECTOR VALVE _________________ 34
ADJUSTING CUTTING HEIGHT ____________ 34
Transport Position ____________________ 34
TRANSAXLE LOCKOUTS ________________ 35
RECOMMENDATIONS FOR MOWING ______ 35
RECOMMENDATIONS FOR TILT-UP DECK
OPERATION/TRANSPORT _______________ 37
Maintenance Instructions __________ 38
MAINTENANCE SCHEDULE CHART _______ 38
IMPORTANT TIPS FOR
CARE OF THE KOHLER ENGINE __________ 39
Fuel System _________________________ 39
Starting/Stopping _____________________ 39
Cooling System ______________________ 39
Air Cleaner System ____________________ 39
Oil__________________________________ 39
LUBRICATION _________________________ 40
Engine Oil ___________________________ 40
Engine Break-In Oil ___________________ 40
Checking Engine Crankcase Oil Level ____ 40
Changing Engine Crankcase Oil/Oil Filter __ 40
Mower Deck Spindle Lubrication ________ 42
DRD52 or DSD60 Mower Deck Lubrication _ 42
Transaxle Lubrication _________________ 42
Transaxle Oil and Filter Change _________ 42
Grease Fitting and Oil Point Lubrication __ 43
CLEANING ____________________________ 46
Engine Air Cleaner System _____________ 46
Cummins/Fleetguard OptiAir™ Air Cleaner 46
Engine Cooling System ________________ 48
Air Intake System ____________________ 48
Cylinder Head Cooling Fins ____________ 48
Grass Buildup in Mower Housing ________ 49
Transaxle Cooling Fins ________________ 51

Table of Contents
CHECKING/SERVICING __________________ 52
Security of Air Filtration Components ____ 52
Battery ______________________________ 52
Electrolyte Level _____________________ 52
Cleaning the Terminals ________________ 53
Charging the Battery __________________ 53
Tire Pressure _________________________ 53
Wheel Nuts Torque ____________________ 53
Sharpen Mower Blades ________________ 53
Drive Belts ___________________________ 54
Spark Plugs __________________________ 54
Fuel Lines and Clamps _________________ 54
PTO U-Joints ________________________ 55
Blade Brake Action ____________________ 55
Safety Switch System__________________ 55
Forward Speed Control Friction Lock _____ 55
REPLACING/REPAIRING _______________ 56
Drive Belts ___________________________ 56
Engine/PTO Belt _____________________ 57
Ground Drive Belt ____________________ 58
Fuel Filter - Model MBS26 ______________ 59
Fuel Filter - Model MBS ________________ 59
Mower Blades ________________________ 59
ADJUSTMENTS ________________________ 60
Transmission Control__________________ 60
Steering Lever Position Adjustment ______ 60
Steering Handles Adjustment ___________ 61
Neutral Position Adjustment ____________ 61
Full Forward Speed Adjustment _________ 62
Straight Tracking Adjustment ___________ 63
FSC Switch - Neutral Adjustment ________ 63
Forward Speed Control
Friction Adjustment ___________________ 64
Blade Clutch (PTO) ____________________ 65
Clutch Engagement/Belt Tension ________ 65
Clutch Disengagement/Brake Action _____ 66
Idler Pulley Maximum Travel Adjustment __ 66
Blade Brake Band Adjustment __________ 67
ELECTRICAL SYSTEM __________________ 67
Illustrated Parts Manual
TRACTOR AND DECK DECALS ___________ 68
BODY / CHASSIS ASSEMBLY _____________ 70
MAIN COMPONENT POWER TRANSMISSION 72
ENGINE GROUP (MODEL MBS26) _________ 74
ENGINE GROUP (MODEL MBS) ___________ 76
HYDROSTATIC GROUND
DRIVE ASSEMBLIES ____________________ 78
STEERING CONTROL ASSEMBLIES _______ 80
ELECTRICAL ASSEMBLY (MODEL MBS26) __ 82
ELECTRICAL ASSEMBLY (MODEL MBS) ____ 84
60 INCH COMPLETE CARRIER
FRAME ASSEMBLY _____________________ 86
DSD60 DECK ASSEMBLY ________________ 88
52 INCH COMPLETE CARRIER
FRAME ASSEMBLY _____________________ 90
DRD52 DECK ASSEMBLY ________________ 92
MULCHING KIT _________________________ 94
WIRING SCHEMATIC (MODEL MBS26) _____ 96
WIRING SCHEMATIC (MODEL MBS) _______ 98
Warranty _____________________ 99

General Information
1
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 oper ation 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 for the meanings of DANGER, WARN-
ING, CAUTION, IMPORTANT, and NOTE.
GLOSSARY
There are many terms that are either unique to this
equipment or that are used as acronyms. The fol-
lowing 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, blade spindles, and cutter
blades.
• ELECTRONIC CONTROL UNIT (ECU) controls
engine functions such as spark timing, fuel/air
ratio, etc.
• FORWARD SPEED CONTROL (FSC) controls
the maximum forward speed of the tractor;
functioning as a cruise control.
• GROUND DRIVE refers to the dual transaxles
which drive the main wheels.
• 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.
• 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 col-
lect the mowed material.
• STEERING LEVERS steer the tractor by con-
trolling the two transaxles.
• TRACTOR is the prime mover, including the en-
gine, drive train, operator seat, and controls to
operate the mower.
• TRANSAXLE transmits and controls power
from the ground drive belt to the main drive
wheel.
• TRANSAXLE LOCKOUT RODS release the
transaxles to permit freewheeling the tractor.
IDENTIFYING NUMBER LOCATIONS
The tractor serial number plate is afxed to the tractor
body just below the left rear corner of the seat. The
mower deck serial number plate is afxed alongside
the angle iron framing on the LH side of the LH mower
blade drive. Model and serial numbers are helpful
when obtaining replacement parts and maintenance
assistance. For ready reference, please record these
numbers in the space provided.
Fill In By Purchaser
Tractor Model No. ______________________
Tractor Serial No. ______________________
Deck Serial No. ______________________
Engine Model No. ______________________
Engine Serial No. ______________________
Date of Purchase ______________________

General Information
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 for the location of the engine serial number.
For the mower model(s) covered by this manual, an
engine manual is available from Kohler covering the
Kohler engines.
Serial Number
Engine Serial Number Location
SERVICING OF ENGINE AND DRIVETRAIN
COMPONENTS
The detailed servicing and repair of the engine and
transaxle are not covered in this manual. Only rou-
tine 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 com-
ponent manufacturer. Any unauthorized work
done on these components during the warranty
period may void the warranty. If you have any dif-
culty nding an authorized outlet or obtaining
warranty service, please contact our Service Depart-
ment 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 com-
ponents from their respective manufacturers as fol-
lows:
Kohler Engines Kohler Company
Kohler, WI 53044
800-544-2444
www.kohlerengines.com
Transaxles Hydro-Gear
1411 South Hamilton St.
Sullivan, IL 61951

Specications
3
MODEL MBS MBS26
ENGINE
Manufacturer/Model Kohler Command CH740,
2 Cyl. OHV (Air-Cooled)
Kohler Command Pro®
CH26, 2 Cyl., Gasoline (Air-
Cooled), Electronic Fuel
Injection (EFI)
Displacement 44.0 cu. in. (725 cc) 44.0 cu. in. (725 cc)
HP (@ 3600 RPM) 27.0 26.0
Max. RPM (No Load) 3600 ± 100 3750
Governed RPM 3600 ± 100 3600 ± 100
Max. Torque [ft-lb (N·m) @ RPM] 29.5 (40.0) @ 2400 40 (54.2) @ 2800
Idle RPM 1200 ± 75 1200 ± 75
Spark Plug Type Champion® RC14YC Champion® RC12YC
Spark Plug Gap .030 in. (0.76 mm) .030 in. (0.76 mm)
Crankcase Capacity 1.9 qts (1.8 liters) 1.9 qts (1.8 liters)
Crankcase Lubricant SG/SH/SJ or Higher Grade Oil
Only with 10W-30 Viscosity
Above 0° F (-18° C) or 5W-20
or 5W-30 below 32° F (0° C)
SG/SH/SJ or Higher Grade Oil
Only with 10W-30 Viscosity
Above 0° F (-18° C) or 5W-20
or 5W-30 below 32° F (0° C)
Oil Filter 12 050 01 5 (2-1/2) 12 050 01 5 (2-1/2)
Fuel Tank Capacity 10 Gallons (38.0 liters)
Two Independent Five (5) Gal-
lon Tanks with Selector Valve
10 Gallons (38.0 liters)
Two Independent Five (5) Gal-
lon Tanks with Selector Valve
Fuel Automotive Grade Unleaded
Gasoline (87 Octane) or
Gasohol (Up to 10% Ethyl
Alcohol, 90% Unleaded
Gasoline by Volume)
Automotive Grade Unleaded
Gasoline (87 Octane) or
Gasohol (Up to 10% Ethyl
Alcohol, 90% Unleaded
Gasoline by Volume)
Cooling System Air Cooled Air Cooled
ELECTRICAL SYSTEM
Battery 12 Volt (340 CCA) 12 Volt (340 CCA)
Charging System 15 Amp Alternator Flywheel Alternator
Charging Output 15 Amp DC (Regulated) 25 Amp DC (Regulated)
System Polarity Negative Ground Negative Ground
Ignition Electronic Capacitive Discharge Electronic Capacitive Discharge
Starter 12 Volt Electric Key and
Solenoid Operated
12 Volt Electric Ring-Gear
Type, Solenoid Operated
Interlock Switch Ignition Lockout by Seat
Switch, Transmission Neutral
and Blade Clutch
Ignition Lockout by Seat
Switch, Transmission Neutral
and Blade Clutch
Circuit Breaker Manual Reset (30A) Manual Reset (30A)

Specications
4
MODEL MBS MBS26
TRANSMISSION
Manufacturer/Model Dual, Independent Hydro-Gear
Integrated Transaxles
Dual, Independent Hydro-Gear
Integrated Transaxles
Steering Hand Lever Control / Individual
Wheel
Hand Lever Control / Individual
Wheel
Forward Speed Control Precision Friction Lock Lever,
Cruise Control, with Neutral-
Park Position
Precision Friction Lock Lever,
Cruise Control, with Neutral-
Park Position
Service Brake Dynamic Braking through
Transaxles
Dynamic Braking through
Transaxles
Parking Brake (Internal) Mechanical Lockout
for each Transaxle
(Single Lever Control)
(Internal) Mechanical Lockout
for each Transaxle
(Single Lever Control)
Neutral Transmission Release by
Manual Dump Valve
Transmission Release by
Manual Dump Valve
Final Drive Direct Drive Axle from
Transaxle
Direct Drive Axle from
Transaxle
Transmission Fluid
Factory Service 20W-50 Multi-Viscosity Motor
Oil (Minimum SL Grade Oil)
20W-50 Multi-Viscosity Motor
Oil (Minimum SL Grade Oil)
Transmission Fluid Capacity 79  oz (2336 ml) 1 qt (1 liter)
Transmission Cooling Cooling Fan Mounted on
Drive Pulley
Cooling Fan Mounted on
Drive Pulley
Ground Travel Speed
Forward m.p.h. (km/h)
Reverse m.p.h. (km/h)
0-9 (0-14) Innitely Variable
0-5 (0-8) Innitely Variable
0-9 (0-14) Innitely Variable
0-5 (0-8) Innitely Variable
BLADE DRIVE
PTO Shaft Sliding Spline Shaft with
Two (2) High-Speed U-Joints
Sliding Spline Shaft with
Two (2) High-Speed U-Joints
Blade Spindle Each Blade (3) Mounts Directly
on Belt Driven Spindles
Each Blade (3) Mounts Directly
on Belt Driven Spindles
Blade Drive Clutch and Brake Manual Belt Tightener Clutch
and Band Brake [Stops Blades
within Five (5) Seconds of
Disengagement]
Manual Belt Tightener Clutch
and Band Brake [Stops Blades
within Five (5) Seconds of
Disengagement]
Max. Blade Speed
[20-1/2 in. (52 cm) Blade] @
3600 RPM Engine
3200 RPM
[18300 FPM (5578 m/min)]
3200 RPM
[18300 FPM (5578 m/min)]
TIRE SIZE
Deck Caster Wheel 13 x 5.00-6 Pneumatic (4-Ply) 13 x 5.00-6 Pneumatic (4-Ply)
Drive 22 x 10.50-12
(4-Ply Low-Prole)
22 x 10.50-12
(4-Ply Low-Prole)
Rear 13 x 5.00-6 (4-Ply) 13 x 5.00-6 (4-Ply)

Specications
5
MODEL MBS MBS26
TIRE PRESSURE
Deck Caster Wheel 20 PSI (137 kPa) 20 PSI (137 kPa)
Drive 15 PSI (103 kPa) 15 PSI (103 kPa)
Rear 20 PSI (137 kPa) 20 PSI (137 kPa)
DIMENSIONS (Tractor and Mower)
Length 100-1/4 in. (255 cm) 100-1/4 in. (255 cm)
Width
60 in. (152 cm) SD Model
(with Deector)
62 in. (158 cm) 62 in. (158 cm)
Height 47-1/2 in. (121 cm) 47-1/2 in. (121 cm)
Wheel Base (Tractor) 42-5/8 in. (109 cm) 42-5/8 in. (109 cm)
Tread Width (Tractor) 36-1/2 in. (93 cm) 36-1/2 in. (93 cm)
MOWER DECK
Width of Cut 52 or 60 in. (132 or 152 cm) 52 or 60 in. (132 or 152 cm)
Cutting Height 1 to 5 in. (3 to 13 cm) 1 to 5 in. (3 to 13 cm)
Height Adjustment 17 Positions - 1/4 in. (1 cm)
Increments
17 Positions - 1/4 in. (1 cm)
Increments
Blade Size
52 in. (132 cm) RD Model 18.3 in. (46 cm) Three (3)
Clockwise-Rotating Blades
18.3 in. (46 cm) Three (3)
Clockwise-Rotating Blades
60 in. (152 cm) SD Model 20-1/2 in. (52 cm) Three (3)
Clockwise-Rotating Blades
20-1/2 in. (52 cm) Three (3)
Clockwise-Rotating Blades
Deck Suspension Torsion-Flex Frame with Caster
Wheels and
Counterweight Springs
Torsion-Flex Frame with Caster
Wheels and
Counterweight Springs
CURB WEIGHT (Approximate)
Tractor Only 730 lb (331 kg) 735 lb (333 kg)
SD Tractor and 60 in. SD Deck 1110 lb (503 kg) 1115 lb (506 kg)
DRIVE BELTS
Engine PTO Walker P/N 2230 Walker P/N 2230
Ground Drive Walker P/N 2248 Walker P/N 2248
SEAT Contour-Molded, with Nylon
Backed Vinyl Cover and
Integral Foam Cushion
(Suspension)
Contour-Molded, with Nylon
Backed Vinyl Cover and
Integral Foam Cushion
(Suspension)
FRAME/BODY CONSTRUCTION
Frame/Body 3/16 Plate Steel/14 Gauge
Sheet Steel
3/16 Plate Steel/14 Gauge
Sheet Steel
Deck 11 Gauge Steel 11 Gauge Steel
NOTE: The manufacturer reserves the right to make changes in specications shown herein at any time
without notice or obligation.

Component Identication
6
Front View and Right Side View
NOTE: Control Identication
shown in Operating
Instructions section.
Body Lift
Handle
Forward Speed
Control (FSC)
Friction
Adjustment
Deck Support Arm
(Not Visible)
Height Adjustment Arm
(Cutting Height Adjustment)
Deck
Discharge Shield
Deck Height
Lift Chain
Tilt-Up Hook
(Not Visible) Deck
Caster Wheels
Tilt Bar
Deck Handle
Deck Support Arm
(Not Visible)
Tilt-Up Latch
Footrests
Counterweight Spring and
Protective Cover
Deck Height
Adjustment Trigger
(Not Visible)

Component Identication
7
Rear View and Left Side View
Spread
Tail Wheel
Battery
(Not Visible)
Footrest Catch
Assembly
Left Hand
Drive Wheel
Footrests
Fuel Pickup
Line
Fuel Tank
and Cap
Mufer
Tailpipe

Component Identication
8
Top View (Body Raised) Model MBS26
RH Transaxle
Lockout Rod
Parking Brake
Linkage
Mufer Heat
Shield
LH Transmission
Control Arm
Oil Fill/
Dipstick
LH Transaxle
Lockout Rod
LH Transaxle RH Transaxle
Parking Brake
Fuel Pickup Line
Fuel Tank Cap Fuel Tank
RH Transmission
Control Arm
Air Filter
Cover
Cummins/Fleetguard
OptiAir™ Air Cleaner
PTO Clutch
Lever
Rubber Bumpers
(Body Support)
Air Intake
Plenum
Air Intake Hose
Fuel Return Line
Steering Levers
Dampeners
Transaxle
Expansion
Reservoirs
Fuel Filter
Fuel Pump
(Not Visible)
Fuel Selector
Valve

Component Identication
9
Top View (Body Raised) Model MBS
RH Transaxle
Lockout Rod
PTO Clutch
Lever
Parking Brake
Linkage
Mufer Heat
Shield
LH Transmission
Control Arm
Oil Fill/
Dipstick
LH Transaxle
Lockout Rod
LH Transaxle RH Transaxle
Parking Brake
Fuel Pickup Line
Fuel Tank Cap
Fuel Tank
RH Transmission
Control Arm
Rubber Bumpers
(Body Support)
Air Filter
Cover
Air Intake
Plenum
Air Intake Hose
Fuel Selector
Valve
Steering Levers
Dampeners
Cummins/Fleetguard
OptiAir™ Air Cleaner
Transaxle
Expansion
Reservoirs
Fuel Pump
Fuel Filter

Safety Instructions
10
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 person-
al 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: Identifies 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 at-
tention.
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 necessary for
the operator to use safe operating procedures at all
times. Failure to follow safety instructions con-
tained in this manual may result in personal in-
jury or damage to equipment or property.
If you have any questions concerning setup, opera-
tion, maintenance, or safety, please contact your au-
thorized Walker Mower Dealer or call Walker Manu-
facturing Company at [phone].
BEFORE OPERATING
1. Read and understand the contents of this
Owner’s Manual before starting and operat-
ing the machine. Become thoroughly familiar
with all machine controls and how to stop the
machine and disengage the controls quickly. Re-
placement Owner’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 mower.
Do not allow adults to operate without proper in-
struction.
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 wearing
sandals, sneakers, tennis shoes, or similar light-
weight footwear. Wear substantial protective
footwear.

Safety Instructions
11
6. Do not wear loose tting clothing that could get
caught in moving parts. Do not operate this ma-
chine while wearing shorts; always wear ade-
quate protective clothing, including long pants.
Wearing safety glasses, safety shoes, and a hel-
met is advisable and required by some local or-
dinances and insurance regulations.
7. Prolonged exposure to loud noise can cause im-
pairment or loss of hearing. Operator hear ing
protection is recommended. Wear a suitable
hearing protective device, such as ear muffs or
earplugs.
8. Keep all protective shields and safety de-
vices in place. If a protective shield, safety de-
vice, or decal is damaged, unusable, or miss ing,
repair or replace it before operating the machine.
9. Be sure interlock switches are functioning
correctly, so the engine cannot be started un-
less the Forward Speed Control lever is in the
NEUTRAL-PARK position, and the PTO clutch is
in the DISENGAGED position. Also, the engine
should stop if the operator lifts off the seat with
either the Forward Speed Control (FSC) out of
the NEUTRAL-PARK position or the PTO clutch
in the ENGAGED position.
NOTE: There is a 1 to 1-1/2 second time delay
function on the seat switch to avoid engine pow-
er interruption when driving over bumps.
10. Handle gasoline with care. Gasoline is highly
ammable and its vapors are explosive:
a. Use an approved fuel container.
b. Never add fuel to a running engine or hot
engine (allow hot engine to cool several min-
utes).
c. Keep matches, cigarettes, cigars, pipes,
open ames, or sparks away from the fuel
tanks and fuel container.
d. Always ll the fuel tank(s) 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(s) 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
spe ci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
The engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects or
other reproductive harm.
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 op-
erating the machine. Keep feet on the deck foot-
rests at all times when the tractor is moving and/
or mower blades are operating. Never operate
the tractor without deck or imple ment in-
stalled.
3. For a beginning operator, learn to steer (ma-
neuver) the tractor with a slow engine speed
before attempting any mowing oper ation. Be
aware that, with the front mounted 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 forward
motion of the tractor can always be stopped by
pulling the Forward Speed Control (FSC) into the
NEUTRAL-PARK position.

Safety Instructions
12
5. In case the transmission drive belt breaks during
operation, and if the machine is on a slope, the
machine will freewheel down the slope. To main-
tain control, immediately (1) Release the steer-
ing levers and simultaneously (2) Move the FSC
to the NEUTRAL-PARK position. When the ma-
chine is stopped or moving slowly, engage the
parking brake.
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 the machine if these controls
are in the OPERATING position).
7. Do not operate machine if the operator pres-
ence safety switch system is not working.
Verify proper operation by having the operator lift
off the seat with the engine running and moving
two controls, one at a time; (1) Move the FSC
lever out of the NEUTRAL-PARK position, and
(2) Engage the PTO Clutch. Moving either con-
trol should stop the engine after a 1-1/2 second
delay.
8. Do not run the engine in a conned area with-
out 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 backing
the machine up, look to the rear to be sure no one
is behind the machine. Watch carefully for trafc
when crossing or working near roadways.
12. Disengage the blade drive when transporting the
machine across drives, sidewalks, etc. Never
raise the mower deck while blades are rotat-
ing.
DANGER
Do not mow or dump grass within 5 feet (1.5
meters) of an embankment or retaining wall
with drop off.
13. The maximum recommended side slope op-
erating angle is 20 degrees or 33% grade.
When operating the machine on a slope, reduce
speed and use caution to start, stop, and maneu-
ver. To prevent tipping or loss of control of the
machine, avoid sharp turns or sudden changes
in direction.
14. Never adjust cutting height while the mower
is moving. Before adjusting cutting height or
servicing, move the Forward Speed Control
(FSC) into the NEUTRAL-PARK position, en-
gage the parking brake, and disengage the blade
clutch (PTO). Tractor should not be mov ing
while adjusting cutting height.
NOTE: The clutch brake should normally stop
drive line rotation within ve (5) seconds of dis-
engaging the PTO clutch.
15. Do not operate with the grass deector chute
removed. Keep the deector in the low est pos-
sible position.
16. When using the tilt-up deck, observe the fol-
lowing recommendations:
a. Do not move tractor with deck in tilt-up
position.
b. Never tilt body forward with deck in tilt-up
position.
17. In case of a clogged or plugged mower deck:
a. Disengage the blade clutch (PTO), set the
parking brake, and turn the engine off before
leaving the seat.
b. LOOK to make sure blade drive shaft move-
ment has stopped before trying to unclog the
system.
c. Disconnect the spark plug wires.
d. Never place hands under the deck - use a
stick or similar tool to remove clogged ma-
terial.

Safety Instructions
13
18. If the cutting blades strike a solid object or the
machine begins to vibrate abnormally,
immediately disengage the blade clutch
(PTO), stop the engine, and wait for all moving
parts to stop. To prevent accidental starting,
disconnect the spark plug wires. 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 bolts are torqued to 64 ft-lb (86.8 N·m).
19. Do not touch the engine or mufer while the
engine is running or immediately after stop ping
the engine. These areas may be hot enough to
cause serious burns.
20. When leaving the machine unattended, disen-
gage the blade clutch (PTO), stop the engine,
and remove the key.
MAINTENANCE
1. To prevent accidental starting of the engine when
servicing or adjusting the machine, remove the
key from the ignition switch and disconnect the
spark plug wires.
2. 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 bolts frequently, mak-
ing sure they are tight.
4. Perform only maintenance instructions de-
scribed in this manual. Unauthorized mainte-
nance operations or machine modications may
result in unsafe operating conditions.
5. If the engine must be running to perform a main-
tenance adjustment, keep hands, feet, and cloth-
ing away from moving parts. Do not wear jew-
elry or loose clothing.
6. Always use the proper engine service
manual when working on the engine.
Unauthorized maintenance operations or
modications to the engine may result in
unsafe operating conditions.
7. Altering the equipment or engine in any manner
which adversely affects its operation, perfor-
mance, durability, or use will VOID the warranty
and may cause hazardous conditions.
8. Never attempt to disconnect any safety devices
or defeat the purpose of these safety devices.
9. Do not change the engine governor settings or
overspeed the engine. The governor has been
factory-set for maximum-safe engine operating
speed.
10. Use genuine factory replacement parts. Sub-
stitute parts may result in product malfunction
and possible injury to the operator and/or others.
11. Use care when charging the battery or per-
forming maintenance on the battery and electri-
cal system:
a. Make sure the battery charger is unplugged
before connecting or disconnecting cables
to the battery.
b. Charge the battery in a well-ventilated
space, so gases produced while charging
can dissipate. Make sure the battery vents
in the caps are open.
c. Keep sparks, 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 making
repairs on the electrical system.
IMPORTANT: Keep all applicable manuals im-
mediately accessible to anyone who may oper-
ate or service this machine.

Safety Instructions
14
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 Section.
LH Fender (2802-1)
Model MBS Only
RH Fender (2802-2)
Engine Shroud (5855)
Rear Body,
Above Mufer (5805)
On Engine (6810)
Center Body Behind
Transaxles (9804)
Deck Carrier Frame (8647)
Deck Carrier Frame (8653)
LH Fender (2802-3)
Model MBS26 Only
Deck Housing (2724-7)
ROTATE KNOB CW UNTIL PLAY IS
REMOVED, PLUS ONE ADDITIONAL TURN
CHECK EVERY 8 HOURS OF USAGE
DSD60 Deck Discharge Shield (5848)
Each End of Mower Deck (5808)
PTO Guard (8746)

Safety Instructions
15
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 Section.
On Transfer Mount, MBS
(2010-4)
Flex Coupling Guard (4107-1)
Front Body Adjacent to
RH Steering Lever, MBS (2807-1) Deck Carrier Frame (2748)
Rear Body, Underside
(2107-4)
Deck Housing, DRD52 (2749-1)
Deck Housing (8653-1)
Deck Housing, DSD60 (2749-2)
On Transfer Mount, MBS26
(2010-5)
Front Body Adjacent to RH Steering Lever, MBS26 (2807-2)

Assembly Instructions
16
SETUP INSTRUCTIONS
Walker Mowers are shipped partially assembled to
our distribution network, and are typically assembled
by the selling dealer. For any additional assembly
besides the following, contact your Walker dealer.
Battery Service
CAUTION
Important Battery Service, Installation, and
Changing Tips for MBS26:
• Do not allow the battery cables to touch
opposing terminals. When connecting bat-
tery cables attach the positive (+) cable to
positive (+) battery terminal rst, followed
by negative (-) cable to negative (-) battery
terminal.
• Never start the engine when the cables
are loose or poorly connected to the battery
terminals.
• Never disconnect battery while engine is
running.
• Never use a quick battery charger to start
the engine.
• Never “jump start” the engine using an-
other source. Electricity uctuations can
damage the ECU (Electronic Control Unit).
• Always disconnect negative (-) battery
cable lead before charging battery, and also
unplug harness from ECU before perform-
ing any welding on equipment.
Raise mower body up for battery access. Check the
battery for electrolyte level and charge. The electro-
lyte level should be at the bottom of the vent wells
[1/4 to 1/2 in. (6 to 13 mm) above plates]. If the spe-
cic 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 instruc-
tions.
IMPORTANT: Make sure battery is securely mounted
in the frame. A loose battery may cause damage to
the case resulting in acid leakage and se vere damage
to the machine. A hazard may be cre ated by damage
to critical working parts and safety systems.
Wet Battery Service
If the battery has been shipped wet, but the electrolyte
level is low or the battery needs to be charged then:
1. Fill each battery cell with drinking water to the
bottom of the vent wells.
2. Charge battery. Refer to Battery Charging in this
section.
Dry Battery Service
DANGER
Activating a battery can be dangerous. The
battery should be taken to a reliable service
station, battery store, or power equipment
dealer where a trained techni cian can acti-
vate the battery safely. DO NOT attempt to
activate the battery unless you are experi-
enced in battery service work. The follow-
ing activation and charg ing instructions are
provided for use by a trained battery techni-
cian.
DANGER
Battery electrolyte is a poisonous and cor-
rosive 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.
To ll (activate) battery with electrolyte (if battery has
been shipped dry):
1. Remove the battery hold-down bar, disconnect
the battery cables and lift the battery out of the
tray.
IMPORTANT: Battery must be removed from
the mower before lling with electrolyte.