For Safety, Read All Assembly and Operation Instructions
Prior to Operating Attachment
Beginning S/N: 2018-22223
P/N: 6605-15
Foreword
Thank you. . .for purchasing a Walker Dethatcher Attachment. Every effort has been made to provide you with
the most reliable machine on the market, and we are sure you will be among our many satised 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! Before you operate your machine, please read this entire manual. Some
of the information is crucial for proper operation - it will help protect your investment and ensure that the machine
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 (970) 221-5614, for clarication before
operating or servicing this machine.
This manual covers the A10 Dethatcher Attachment.
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.
Walker Mfg. Co. is continually striving to improve the design and performance of its products. We reserve the right to
make changes in specications and design without thereby incurring any obligation relative to previously manufactured
products.
Sincerely,
i
WALKER MANUFACTURING
COMPANY
Bob Walker, President
Table of Contents
General Information 1
HIGHLIGHTED INFORMATION 1
GLOSSARY 1
IDENTIFYING NUMBER LOCATIONS 1
SERVICING OF DETHATCHER 2
UNIT DESCRIPTION 2
Specications 3
Component Identication 4
Safety Instructions 5
BEFORE OPERATING 5
OPERATING 6
MAINTENANCE 8
Assembly Instructions 9
ATTACH DETHATCHER TO DECK 10
ADJUST TINES 11
Operating Instructions 12
OPERATING THE DETHATCHER 12
TINE ACTION 12
Storage Instructions 13
WALL BRACKET (OPTIONAL) 13
END OF SEASON 13
Maintenance Instructions 13
Parts List/Diagram 15
MAINTENANCE AND SERVICE
RECORDS SHEET 17
Warranty 20
ii
General Information
HIGHLIGHTED INFORMATION
Walker Manufacturing recommends that any service
requiring special training or tools be performed by
an authorized Walker Tractor 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 Tractor are caused
by disregarding basic safety precautions or specic
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,
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 denitions 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.
IDENTIFYING NUMBER LOCATIONS
The dethatcher serial number is afxed to the
mounting bracket. Model and serial numbers are
helpful when obtaining replacement parts and maintenance assistance. For ready reference, please
record these numbers in the space provided.
Dethatcher Serial No.
Date of Purchase
Refer to the Operator’s manual that accompanies
the tractor for the tractor serial number.
Serial Number
●FORWARD SPEED CONTROL (FSC) controls
the maximum forward speed of the tractor; functioning as a cruise control.
●LEFT HAND (LH) refers to the left-hand side of
the tractor when the operator is seated facing
forward in the tractor seat.
●MACHINE consists of the dethatcher, tractor,
and deck functioning as a single unit.
●POWER TAKE-OFF (PTO) transmits engine
power to run the cutter blades and GHS blower.
●RIGHT HAND (RH) refers to the right-hand side
of the tractor when the operator is seated facing
forward in the tractor seat.
●STEERING LEVERS steer the tractor by con-
trolling the two transaxles.
●TRACTOR is the prime mover, including the en-
gine, drivetrain, operator seat, and controls to
operate the mower.
Dethatcher Serial Number Location
(Front LH View)
1
General Information
SERVICING OF DETHATCHER
Only routine maintenance and general service instructions are provided in this manual. Any unau-thorized work done on the dethatcher during the
warranty period may void the warranty. If you have any difculty nding an authorized outlet or obtaining warranty service, please contact our Service
Department for assistance:
Walker Manufacturing Company
5925 E. Harmony Road
Fort Collins, CO 80528
1-970-221-5614
www.walker.com
UNIT DESCRIPTION
The dethatcher can be installed on the front of 36 in.,
42 in., 48 in., and 52 in. gear driven decks without
any tools. When used with a GHS equipped machine, lawn thatch and debris are removed with one
pass.
2
Specications
A10 DETHATCHER
MODELA10
Height in. (cm)35.75 (91)
Width in. (cm)41 (104)
Length in. (cm)25 (64)
Overall Length Installed on Tractor in. (cm)*107.75 (274)
Weight lb (kg)55 (25)
NOTE: The manufacturer reserves the right to make changes in specications shown herein at any time without
notice or obligation.
3
Component Identication
Mounting Bracket
Optional Wall Mount
Lift Lever
(Foldable)
Foot Trigger
RH Mounting Bracket
Caster Wheel
Mount
Channel Mount
Carrier Frame
Channel Mount
LH Mounting Bracket
Tine Tray
Caster Wheel
Mount
Dethatching Tines
Caster Wheels
A10 Dethatcher Front View (Not Installed)
4
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 dened as follows:
DANGER
An IMMEDIATE hazard that WILL result in
severe personal injury or DEATH, if warning is ignored and proper safety precautions are not taken.
WARNING
A POTENTIAL hazard that COULD result in
severe personal injury or DEATH, if warning is ignored and proper safety precautions are not taken.
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 precautions are not taken.
IMPORTANT: Identies mechanical information
demanding special attention, since it deals with the
possibility of damaging a part or parts of the machine.
Walker Manufacturing cannot predict every potentially dangerous situation. Therefore, items labeled
as such in this manual do not cover all conceivable
situations. Any person using 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 instruc-
tions contained in this manual may result in
personal injury or damage to equipment or property.
If you have any questions concerning setup, operation, maintenance, or safety, please contact your
authorized Walker Mower dealer or call Walker
Manufacturing Company at (970) 221-5614.
BEFORE OPERATING
1. Read and understand the contents of this
Operator’s Manual before starting and operating the machine. Become thoroughly famil-
iar 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 mower.
Do not allow adults to operate without proper
instruction.
3. Do not allow anyone other than the operator on
the machine.
4. Keep everyone, especially children and pets, a
safe distance away from the area of operation.
Do not mow with bystanders in the area.
5. Do not operate the machine barefoot or wearing sandals, sneakers, tennis shoes, or similar
lightweight footwear. Wear substantial pro-
tective footwear.
NOTE: Identies information worthy of special
attention.
5
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 regulations.
Safety Instructions
7. Prolonged exposure to loud noise can cause im-
pairment or loss of hearing. Operator hearing protection is recommended. Wear a suitable
hearing protective device, such as earmuffs or
earplugs.
8. Keep all protective shields and safety devices in place. If a protective shield, safe-
ty 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, 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.
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
minutes).
c. Keep matches, cigarettes, cigars, pipes,
open ames, or sparks away from the fuel
tank and fuel container.
WARNING
This product can expose you to
chemicals including Phenylethane which is
known to the State of California to
cause cancer, and N-Methyl-2-Pyrrolidone,
which is known to the State of California
to cause birth defects or other reproductive
harm. For more information go to www.
P65Warnings.ca.gov.
OPERATING
NOTE: Refer to your tractor Operator’s Manual
for safety instructions for operating the tractor.
1. Operate the machine only in daylight or in
good articial light with good visibility of areas
being cleaned.
2. Sit on the seat when starting the engine and operating the machine. Keep feet on footrests at
all times when the tractor is moving and/or the
mower blades are operating.
3. For a beginning operator, learn to steer (ma-
neuver) the tractor with a slow engine speed
before attempting any mowing operation.
Be aware that, with the front mounted mower
deck conguration, the back of the machine
swings to the outside during turns.
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 contain-
er cap securely and clean up any spilled
fuel before starting the engine.
12. Never attempt to make any adjustments while the engine is running, except where
specically instructed to do so.
13. 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.
DANGER
Do not operate around overhanging tree
branches or bushes at the same height as
the operator’s torso and head where inadvertent 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.
6
Safety Instructions
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 simultaneously
(2) Move the FSC to the NEUTRAL-PARK po-
sition. When the machine is stopped or moving
slowly, engage the parking brake.
NOTE: The emergency stop procedure is exactly the same procedure used to normally stop
and park the machine.
6. Disengage the PTO clutch and put the FSC in
the NEUTRAL-PARK position before starting
the engine (an ignition interlock switch normally
prevents starting of the tractor 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
control should stop the engine immediately.
8. Do not run the engine in a conned 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. 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 trafc when crossing or working near roadways.
11. When moving forward, do not suddenly put the
tractor in reverse by rapidly pulling on the steering levers, especially when going downhill, as
this can lift the tractor tail wheel off 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 NEU-
TRAL-PARK position.
13. The maximum recommended slope operating angle is 15 degrees or 26% grade. When
operating the machine on a slope, reduce 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 degrees.
14. Never adjust dethatcher gauge wheels with the
engine running. Before adjusting height or servicing, disengage the PTO clutch, stop the engine, and remove the ignition key. Wait for all
movement to stop before getting off the seat.
NOTE: The PTO brake should stop drive line
rotation within ve (5) seconds of disengaging
the PTO clutch. If the brake is not functioning
properly, adjust or repair the brake before operating the mower. Contact your Walker dealer
for additional help.
15. If the cutting blades strike a solid object or
the machine begins to vibrate abnormally,
immediately disengage the PTO clutch, stop
the engine, and wait for all moving parts to
stop. Disconnect the fuel solenoid wire [die-
sel engines] or the spark plug wire(s) [gasoline
engines] to prevent accidental starting. Thoroughly inspect the mower and repair any damage before restarting the engine and operating
the machine. Make sure cutting blades are in
good condition and blade nuts are torqued to 60
lb•ft (81 N•m).
16. Do not touch the engine or mufer while the engine is running or immediately after
stopping the engine. These areas may be hot
enough to cause serious burns.
17. When leaving the machine unattended, disen-
gage the PTO clutch, stop the engine, and
remove the ignition key.
12. Disengage the PTO clutch when transporting
the machine.
7
Safety Instructions
MAINTENANCE
NOTE: Refer to your tractor Operator’s Manual
for safety instructions for tractor 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 fuel solenoid wire [diesel engines]
or the spark plug wire(s) [gasoline engines].
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, making sure they are tight.
4. Perform only maintenance instructions de-scribed in this manual. Unauthorized main-
tenance operations or machine modications
may result in unsafe operating conditions.
5. If the engine must be running to perform a
maintenance adjustment, keep hands, feet
and clothing away from moving parts. Do
not wear jewelry or loose clothing.
6. Always use proper engine service manuals
when working on the engine. Unauthorized
maintenance operations or modications to the
engine may result in unsafe operating conditions.
7. Altering the machine or engine in any manner
which adversely affects its operation, performance, durability or use will VOID the war- ranty 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.
Substitute parts may result in product malfunction and possible injury to the operator and/or
others.
IMPORTANT: Keep all applicable manuals
immediately accessible to anyone who may
operate or service this machine.
8
Assembly Instructions
7
20
20
F255
F316
F316
F255
20
F434
F017
21
21
23
5809-2
25
F009
The Walker Lawn Dethatcher will effectively dislodge
excessive thatch from your lawn. Thatch is a layer of
stems, clippings, runners, roots, and leaves that have
not decayed. Excessive thatch prevents air, water,
and fertilizer from reaching the roots. These instructions will help ensure proper assembly and operation.
1. Attach the caster wheel mounts to the tine tray as
shown in Install Caster Wheels illustration. In-
stall the caster fork/wheel assembly into the caster wheel mount as shown. Be sure to install the
shock washer and three (3) spacers before in-
stalling the caster fork. Install the remaining three
(3) spacers at the top of the caster fork and install
the lynch pin. Use this as a starting point for the
spacer location.
5809-2
Safety Rod
F571
Dethatching Tine
Tine Retainer Clip
F170
F009
Install Dethatching Tines
(Caster Wheel Assembly Removed for Clarity)
Install Caster Wheels
(Carrier Frame and Tray Mounting Brackets
Removed for Clarity)
2. Attach the tines to the tine tray nger tight, as
shown in the Install Dethatching Tines illustra-
tion. It is important to be sure the loop between
the tine coils nests around the hardware on the
tine tray. After all the tines are installed, tighten
the tine mounting hardware.
3. Insert safety rods through the coils of the tines as
shown in the Install Dethatching Tines illustration. Secure by bending the end of the rod 1-1/2
in. to 2 in. from the end to prevent them from slipping back through the tines. The safety rod must
be free to move slightly from side to side.
WARNING
Failure to install the safety rods can result
in personal injury if a tine should disengage
from the tine tray.
4. Install the foot trigger as shown in Foot Trigger
photo using the 5/16-18 x 1-3/4 Hex Bolt (F316),
5/16 x 1 x 7/64 Flat Washer (F170), Washer
(F060) and 5/16-18 ESNA Nut (F020). Foot
trigger should move freely after tightening nut.
9
Foot Trigger
Assembly Instructions
5. Attach the lift lever to the carrier frame and
tighten hardware as shown in Install Lift Lever
photo and Install Lift Lever Compression Spring photo so that 2 - 3 threads protrude
through the ESNA nut.
Install Bolt
and Washer
Place Over
Pivot Stud
Install Lift Lever
ATTACH DETHATCHER TO DECK
1. Select a smooth, at surface such as a driveway,
sidewalk, garage oor, etc. It is a simple proce-
dure for attachment, with no tools required.
2. Hook the rear legs of the dethatcher under the
front of the deck carrier frame as shown in
Attach Dethatcher to Deck Carrier Frame,
and slide the channel mounts out to the deck
carrier frame arms.
Rear Leg Hooked on
Deck Carrier Frame
Slide Channel Mount
out to Carrier Frame
Install Spring
and ESNA Nut
Friction Washer
P/N 5141-5
(Not Visible)
Install Lift Lever Compression Spring
Attach Dethatcher to Deck Carrier Frame
3. Once the channel mounts are attached to the carrier frame arms, install the lock pins as shown in
Install Lock Pins to Channel Mounts photo.
The dethatcher should be centered between the
carrier frame of the deck.
Install Lock
Pin
Install Lock Pins to Channel Mounts
4. To remove the dethatcher, reverse the installation
process.
10
Assembly Instructions
ADJUST TINES
Check and adjust the dethatcher tine working height
on a at surface. With the dethatcher mounted on the
mower deck and the tines lowered into the working
position, the tine ends should be approximately 1/2 in.
(13mm) above the surface as shown in the Adjust Tine Working Height photo. The tines should touch
the surface when pushed back. If the tine vertical position needs to be adjusted, use the spacer washers
on the caster wheel forks as follows (each spacer
washer gives 1/8 in. [3mm] of adjustment):
1. To raise the tines, remove the linch pin and move
spacers from the top of the caster fork and place
them on the bottom.
2. To lower the tines, remove spacers from the bottom of the caster fork and place them on the top of
the caster fork.
1/2 in.
Adjust Tine Working Height
11
Operating Instructions
OPERATING THE DETHATCHER
The dethatcher can be raised or lowered to engage,
or disengage, the tines as desired.
1. To engage the dethatcher, pull back on the lift
lever. While holding the foot trigger, lower the
dethatcher into the working position as shown in
Engaging Dethatcher photo.
Pull Back on
Lift Lever
Hold Foot
Trigger
FREE POSITION
THATCHING POSITION
RELEASED POSITION
Engaging Dethatcher
2. To disengage the dethatcher, pull back on the
lift lever until the trigger assembly engages the
mounting bracket.
NOTE: When raising/disengaging the dethatcher, there is resistance due to the tines being en-
gaged. It is easier to disengage the tines by
stopping the tractor forward motion and reversing the tractor while lifting.
TINE ACTION
Grass should be less than 3 in. (8cm) tall for pro-
per tine action. When in use, all of the tines should
deect back independently and “ip” the thatch
forward as shown in the Tine Action illustration. If
the tines drag without ipping forward, the tines are
too low and need to be raised. If the tines remain
in the free position, the tines are too high and
needs to be lowered. Refer to Adjust Tines in
the Assembly Instructions and adjust as needed
for proper dethatching action.
Tine Action
12
Storage Instructions Maintenance Instructions
WALL BRACKET (OPTIONAL)
Use the P/N 6606-11 Wall Mount and foldable Lift
Lever to store dethatcher in trailer or storage area
when not in use.
Lift Lever
Folded DOWN
Wall Mount
P/N 6606-11
END OF SEASON
1. Clean and inspect the dethatcher thoroughly,
noting any replacement parts that will be needed before the next season.
The Walker Lawn Dethatcher is nearly mainten-
ance free. However, periodically grease will need
to be added to the grease ttings on the caster
wheel mounts and the pivot points shown in A10
Lubrication Points Diagram will need to be oiled.
Also inspect for broken/worn tines and replace as
needed.
2. Repaint all parts from which paint has worn.
NOTE: Rustproong or painting every year will
prolong the life of the dethatcher.
3. When the dethatcher is dry, apply oil to tines to
prevent rust. Apply lubricant liberally to all exposed surfaces to protect against rust.
Walker Manufacturing company will, at its option, repair or replace, without charge, any part covered
by this warranty which is found to be defective in material and/or workmanship within one (1) year after
date of sale to the original retail purchaser unless the product is used for rental purposes, in which case
this warranty is limited to ninety (90) days. At Walker’s request, customer will make the defective part
available for inspection by Walker and/or return the defective part to Walker, transportation charges
prepaid. All parts and components of the Walker A10 Dethatcher are covered by this warranty.
What this warranty does not cover:
A. This warranty does not cover defects caused by depreciation or damage caused by normal wear,
accidents, improper maintenance, improper use or abuse of the product, alterations, or failure to follow
the instructions contained in the Operator’s Manual for operation and maintenance.
B. The customer shall pay any charges for making service calls and/or for transporting the attachment
to and from the place where the inspection and/or warranty work is performed.
How to obtain service under this warranty:
Warranty service can be arranged by contacting the dealer where you purchased the attachment or by
contacting Walker Manufacturing Company, 5925 East Harmony Road, Ft. Collins, CO 80528. Proof of
the date of purchase may be required to verify warranty coverage.
4.
Warranty limitation:
A. THERE IS NO OTHER EXPRESS WARRANTY. ANY WARRANTY THAT MAY BE IMPLIED FROM THIS
PURCHASE INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS HEREBY
LIMITED TO THE DURATION OF THIS WARRANTY AND TO THE EXTENT PERMITTED BY LAW ANY
AND ALL IMPLIED WARRANTIES ARE EXCLUDED. Some states do not allow limitations on how long an
implied warranty lasts, so the above limitations may not apply to you.
B. WALKER WILL NOT BE LIABLE FOR ANY INCIDENTAL, CONSEQUENTIAL, OR SPECIAL DAMAGES AND/OR EXPENSES IN CONNECTION WITH THE PURCHASE OR USE OF THE MACHINE. Some
states do not allow the exclusion or limitation of incidental or consequential damages, so the above
limitation(s) or exclusion(s) may not apply to you.
C. Only the warranty expressed in this limited warranty shall apply and no dealer, distributor, or individual
is authorized to amend, modify, or extend this warranty in any way. Accordingly, additional statements
such as dealer advertising or presentations, whether oral or written, do not constitute warranties by
Walker, and should not be relied upon.
D. This warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
20
WALKER MFG. CO. • 5925 E. HARMONY ROAD, FORT COLLINS, CO 80528 • (970) 221-5614