Walker H27i User manual

Operator’s Manual
Safety, Assembly, Operating, and Maintenance Instructions
Please Read and Save These Instructions
For Safety, Read All Safety and Operation
Instructions Prior to Operating Machine
Beginning S/N: 168265
P/N 2000-38

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
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 H27i with the Kohler Command Pro ECH749 (27.0 HP) Electronic Fuel
Injection (EFI) 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
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

H27i 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 ...................................6
Safety Instructions 9
Before Operating .................................................9
Operating............................................................11
Maintenance.......................................................13
Safety, Control, and Instruction Decals...........14
Assembly Instructions 18
Setup Instructions.............................................18
Tire Installation (Tractor)...........................................18
Battery Service..........................................................18
Battery Charging ...................................................19
Battery Installation.................................................19
Mower Deck Assembly..............................................19
Deck Caster Wheels Installation ...........................19
Deck Discharge Deector
Shield Installation .................................................20
PTO Shaft Guard Installation ................................20
Tilt-Up Roller Wheel Installation ...........................20
Mower Deck Installation on Tractor...........................20
Deck Installation....................................................20
Deck Leveling........................................................22
Measuring Deck Levelness ...........................22
Deck Leveling Procedure..............................23
Preoperating Checklist .....................................24
Operating Instructions 27
Control Identication, Location, and
Function ............................................................27
Ignition Switch...........................................................27
Engine Throttle..........................................................28
Body Latch................................................................28
Forward Speed Control (FSC) ..................................28
Steering Levers.........................................................28
Blade Clutch (PTO)...................................................28
Parking Brake ...........................................................29
Oil Pressure Warning Light/Horn ..............................30
Engine Service Light.................................................30
Over Temperature Warning Light/Horn .....................30
Transaxle Lockout Arms ...........................................31
Circuit Breaker ..........................................................31
Hourmeter.................................................................31
Roll-Over Protection System (ROPS, Optional)........32
Suspension Seat.......................................................33
Starting the Engine............................................36
Adjusting Ground Speed and Steering ...........36
Engaging the Blade Drive.................................38
Stopping the Machine .......................................39
Fuel Tank Selector Valve...................................40
Adjustable Foot Rests.......................................40
Adjusting Cutting Height ..................................40
Transport Position.....................................................41
Transaxle Lockout.............................................41
Recommendations for Mowing ........................42
Recommendations for Towing .........................44
Recommendations for Tilt-Up Deck
Operation/Transport..........................................44
Maintenance Instructions 45
Maintenance Schedule Chart ...........................45
Important Tips for Care of the
Kohler Engine ....................................................46
Fuel System..............................................................46
Starting/Stopping ......................................................46
Cooling System.........................................................46
Air Cleaner System...................................................46
Oil..............................................................................47
Lubrication.........................................................47
Engine Oil .................................................................47
Engine Break-In Oil ...............................................47
Checking Engine Crankcase Oil Level..................47
Changing Engine Crankcase Oil/Oil Filter.............48
Mower Deck Spindle Lubrication ..............................49

Table of Contents H27i
DR52, DS61 or DR64 Mower
Deck Lubrication .......................................................49
Check Transaxle Fluid Level.....................................49
Grease Fitting and Oil Point Lubrication ..................49
Transaxle Oil and Filter Change ...............................52
Cleaning .............................................................53
Engine Air Cleaner System.......................................53
Turbine Precleaner ................................................53
Cummins/Fleetguard OptiAir™
Air Cleaner ............................................................53
Engine Cooling System.............................................55
Cooling Air Intake Screen......................................55
Cylinder Head Cooling Fins...................................56
Grass Buildup in Mower Deck Housing ....................57
Transaxle Housing ....................................................58
Checking/Servicing ...........................................59
Security of Air Cleaner System .................................59
Battery.......................................................................59
Cleaning the Terminals..........................................59
Charging the Battery .............................................60
Tire Pressure ............................................................60
Wheel Nut Torque .....................................................60
Sharpen Mower Blades.............................................60
Drive Belts.................................................................61
Spark Plugs...............................................................61
Ignition Wires ............................................................61
Fuel Lines and Clamps .............................................62
Engine Starter...........................................................62
Transmission Control Setting....................................62
Neutral-Park ..........................................................62
Straight Ground Tracking ......................................62
Blade Brake Action....................................................62
PTO U-Joints ...........................................................62
Safety Switch System ...............................................63
Forward Speed Control Friction Lock .......................63
Replacing/Repairing..........................................64
Drive Belts.................................................................64
Engine/PTO Belt....................................................65
Ground Drive Belt..................................................66
Deck Drive Belt......................................................67
Fuel Filter .................................................................68
Mower Blades ...........................................................69
Adjustments.......................................................70
Transmission Control ................................................70
Steering Lever Position Adjustment ......................70
Steering Handle Adjustment..................................70
Neutral Function Adjustment .................................71
Full Forward Speed Adjustment ............................72
Straight Tracking Adjustment.................................72
FSC Neutral Switch Adjustment ............................72
Forward Speed Control
Friction Adjustment................................................73
Blade Clutch (PTO)...................................................74
Clutch Engagement/Belt Tension ..........................74
Clutch Disengagement/Brake Action.....................75
Idler Pulley Maximum Travel Adjustment ..............75
Blade Brake Band Adjustment ..............................76

H27i 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 9 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, 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.
●REAR DISCHARGE (RD) discharges mowed
material from the back of the mower deck.
●RIGHT HAND (RH) refers to the right-hand
side of the tractor when the operator is seated
facing forward in the tractor seat.
●ROLL-OVER PROTECTION SYSTEM
(ROPS) o󰀨ers enhanced operator protection in
the event of a roll-over type accident.
●SIDE DISCHARGE (SD) discharges mowed
material from the right side of the mower deck.
●STEERING LEVERS steer the tractor by
con trolling the two transaxles.
●TRACTOR is the prime mover, including the
engine, drivetrain, 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 ARMS release the
transaxles to permit freewheeling 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 H27i
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 and
transaxles are not covered in this manual. Only
rou tine maintenance and general service instruc-
tions are provided. For the service of these com-
ponents during the limited warranty period, it is
important to nd a local, authorized servicing agent
of the com ponent manufacturer. Any unauthor-
ized 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 Depart ment for assistance:
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:
Kohler Engines Kohler Company
Kohler, WI 53044
800-544-2444
www.kohlerengines.com
Transaxles Hydro-Gear
1411 South Hamilton St.
Sullivan, IL 61951
877-728-7410
www.hydro-gear.com

H27i Specications
3
SPECIFICATIONS
ENGINE
Manufacturer/Model Kohler Command Pro® ECH749, 2 Cyl., OHV, Gasoline
(Air-Cooled), Electronic Fuel Injection (EFI)
Displacement cu. in. (cc) 45.6 (747)
Max. Power HP (kW) 27.0 (20.1) @ 3600 RPM
Governed RPM 3600
Max. Torque lb·ft (N·m) 40 (54)
Idle RPM 1200
Spark Plug Type Champion® RC12YC
Spark Plug Gap in. (mm) .030 (0.76)
Crankcase Capacity qt (L) 2.0 (1.9)
Crankcase Lubricant
(From Factory)
300 Hour, Kohler PRO® Synthetic 10W-50 Kohler P/N 25 357 72-S
Oil Filter (From Factory) 300 Hour, Kohler PRO® Filter P/N 25 050 53-S
Conventional Crankcase Lubricant
(Alternative Option)
100 Hour, API SJ or Higher Grade Oil Only with 10W-30 Viscosity
Above 0° F (-18° C), or 5W-30 Viscosity Below 32° F (0° C)
Oil Filter (Alternative Option) 200 Hour, Kohler Filter P/N 12-050-01-S
Cooling System Air-Cooled
Fuel Tank Capacity gal (L) 9.4 (35.6), Two Independent 4.7 Gallon Tanks with Selector Valve
Fuel Regular Grade Unleaded Gasoline
(87 Octane Minimum, 10% Ethanol Maximum)
Air Cleaner Remote Mounted Cummins/Fleetguard OptiAirTM
(Walker P/N 2090-1 Primary/2090-3 Safety Filter)
ELECTRICAL SYSTEM
Battery 12 Volt, 350 CCA (Interstate SP-40)
Charging System Flywheel Alternator
Charging Output 20 Amp DC (Regulated)
System Polarity Negative Ground
Ignition Electronic Capacitive Discharge
Starter 12 Volt Electric Ring-Gear Type, Solenoid Operated
Interlock Switches Ignition Lockout by Seat Switch, Transmission Neutral,
Blade Clutch, and Parking Brake
Circuit Breaker Manual Reset (20A)
Auto Reset (30A)
TRANSMISSION
Manufacturer/Model Dual, Hydrostatic Hydro-Gear® ZT3400 Integrated Transaxles
Steering Hand Lever Control / Individual Wheel
Forward Speed Control Precision Friction Lock Lever, Cruise Control, with
Neutral-Park Position

Specications H27i
4
TRANSMISSION (CONTINUED)
Service Brake Dynamic Braking through Transaxles
Parking Brake Internal Mechanical Cog Lock for each Transaxle
(Single Lever Control)
Neutral Transmission Release by Manual Dump Valve
Final Drive Direct Drive Axle from Transaxle
Transmission Fluid
Factory Service 20W-50 Multi-Viscosity Motor Oil (Minimum SL Grade Oil)
Transmission Oil Capacity  oz (L) 77 (2.3)
Transmission Cooling Cooling Fan Mounted on Drive Pulley
Oil Filter Hydro-Gear® P/N 52114 (Walker P/N 2026-6)
Ground Travel Speed
Forward MPH (km/h)
Reverse MPH (km/h)
0-10 (0-16) 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 13 x 4.50-6 (Pneumatic 6-Ply)
Drive 22 x 10.50-12 (4-Ply Low-Prole)
Tailwheel 13 x 4.50-6 (Pneumatic 6-Ply)
TIRE PRESSURE PSI (KPA)
Deck Caster Wheel 20 (137)
Drive 15 (103)
Tailwheel 20 (137)
DRIVE BELTS
Engine PTO Walker P/N 2230 (Set of 3)
Ground Drive Walker P/N 2248-1
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

H27i Specications
5
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 69 (175)
Tractor Wheel Base 45 (115)
Tractor with Tilted Deck
(Approximate)
87.75 (223)
Tractor with 64" Rear Discharge
Deck (DR64-3)
107.75 (274)
Width in. (cm)
Tractor Only (Outside Tire) 46.5 (118)
Tractor with 64" Rear Discharge
Deck (DR64-3)
66 (168)
Tread Width 36.5 (93)
Height in. (cm)
Tractor 47.25 (118)
With ROPS (Optional) 66.25 (168)
With ROPS (Optional) Lowered 51.25 (130)
Weight lb (kg)
Tractor Only 748 (340)
Tractor with 64" Rear Discharge
Deck (DR64-3)
1185 (537)
DECK DR52 DR64 DS61
Type Belt-Driven,
Rear Discharge
Belt-Driven,
Rear Discharge
Belt-Driven,
Side Discharge
Cutting Width in. (cm) 52 (132) 64 (163) 61 (155)
Cutting Height in. (cm) 1.5 to 5 (3.8 to 12.7)
Height Adjustment in. (cm) 1/4 (1) Increments, 15 Positions
Blade Length in. (cm) 18.4 (47) 22.2 (56) 20.5 (52)
Number of Blades 3
Direction of Rotation
(Viewed from top of deck)
Clockwise
Deck Suspension Torsion-Flex Frame with Caster Wheels and Counterweight Springs
Maximum Blade RPM 3840 3200 3330
Maximum Blade Tip Speed
ft/min (m/min)
18500 (5640) 18500 (5640) 17870 (5460)
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.

Component Identication H27i
6
COMPONENT IDENTIFICATION
NOTE: Operator Controls are identied in the sec-
tion Operating Instructions on page 27.
Front View and Right Side View
Body Tilt-Up
Latch
Body Lift
Handle
Deck Tilt-Up
Socket
Deck
Tilt-Up Bar
Tilt-Up Latch
Deck Support Arm
(Not Visible)
Forward Speed
Control (FSC)
Friction
Adjustment
Tilt-Up
Hook
Cutting Height Release
Lever (Cutting Height
Adjustment)
Deck Lift Foot Pedal
(Raises Deck)
Deck Height
Lift Chain
Deck
Caster Wheels
Counterweight Springs and
Protective Covers
Deck
Support Arm
Adjustable
Footrests