Walker A44 Operation and maintenance manual

Assembly, Attaching, Removing, Operation, and Maintenance
Please Read and Save These Instructions
For Safety, Read All Assembly and Operation Instructions
Prior to Operating Attachment
A44 Dozer Blade Attachment
Operator’s Manual
Beginning S/N: 2022-1807
P/N: 6625-16
Compatible with Models: MR21

Foreword
Thank you. . .for purchasing a Walker A44 Dozer Blade Attachment. 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 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. . . 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 [phone], for clarication before operating or servicing this machine.
This manual covers the Walker A44 Dozer Blade 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 specications and design without thereby incurring any obligation relative to previously manufactured
products.
Sincerely,
WALKER MANUFACTURING COMPANY
Bob Walker, Chairman

Table of Contents
ii
Table of Contents
General Information 1
Highlighted Information.........................1
Glossary ....................................1
Serial Number Location ........................1
Servicing of the Dozer Blade.....................2
Unit Description ..............................2
Specications 3
Requirements ................................3
Replaceable Cutting Edge Kits ...................3
ComponentIdentication 4
Safety Instructions 5
Before Operating .............................5
Operating ...................................6
Maintenance.................................8
Assembly and Installation 9
Assembling the Blade ..........................9
Installing the dozer blade ...................... 11
Removing The Dozer Blade ....................15
Operating Instructions 17
Lift/Lower Blade .............................17
Adjusting the Lift Handle Assist Spring .......17
Blade Angle.................................17
Trip-Over Extension Spring.....................18
Trip-Over Lock ..............................18
Blade Articulation ............................19
Blade Articulation Adjustment..............19
Blade Articulation Lock...................20
Maintenance 21
Cutting Edge (Wear Strip)......................21
Lubrication .................................21
Parts Lists and Diagrams 22
A44 Dozer Blade Parts List .....................22
A44 Dozer Blade Parts Diagram .................23
LimitedWarranty 24

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 Tractor 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 5 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 car-
rier frame, deck housing, blade spindles, and
cutter blades.
●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 implement installed
on the tractor, functioning as a single unit.
●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
engine, drivetrain, operator seat, and controls
to operate the mower.
SERIAL NUMBER LOCATION
The dozer blade’s serial number is afxed to the
attachment frame. Serial numbers are helpful
when obtaining replacement parts and mainte-
nance assistance. For ready reference, please
record your serial number in the space provided.
Dozer Blade Serial No.
_ _____________________
Date of Purchase __________________________
Refer to the tractor Operator’s Manual for the
tractor serial number information.
Serial
Number
Dozer Blade S/N Location

General Information
2
SERVICING OF THE DOZER BLADE
Only routine maintenance and general service
instructions are provided in this manual. Any
unauthorized work done 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
Department for assistance:
Walker Manufacturing Company
5925 E. Harmony Road
Fort Collins, CO 80528
1-970-221-5614
www.walker.com
UNIT DESCRIPTION
The A44 Dozer Blade is a 48” blade that can be
used for snow removal or as light utility tool for
moving dirt, mulch, or other debris. The design
includes spring-assisted raise and lower, a 5-way
foot-engaged angle adjustment, trip-over protec-
tion, +/-5° of articulation to follow ground contour,
and a replaceable wear strip.

Specications
3
Specications
MODEL A44DOZERBLADE
Height of handle installed in. (cm) 32 (81)
Height of blade in. (cm) 14 (36)
Width in. (cm) 48 (122)
Length in. (cm) 36 (91)
Overall Length Installed on Tractor in. (cm) 84 (213)
Weight lb. (kg) 145 (66)
REQUIREMENTS
● MR Tail Weight Kit, P/N 1647-10 - This kit is required to be installed with the A44 Dozer Blade.
REPLACEABLE CUTTING EDGE KITS
● Dozer Blade Polyurethane Cutting Edge Kit 48”, P/N 6625-10
● Dozer Blade Steel Cutting Edge Kit 48”, P/N 6624-21
NOTE: The manufacturer reserves the right to make changes in specications shown herein at any time with-
out notice or obligation.

4
Component Identication
ComponentIdentication
Dozer Blade LH Side View (Not Installed)
Replaceable Cutting
Edge
Trip-Over
Lock
Articulation
Joint
Angle Stop
Bolt (LH)
Lift Handle Assist
Spring
Lift Handle
Foot Trigger
(Blade Angle)
Blade
Mount
Extension Spring
(Trip-Over Spring)
LH Footrest

5
Safety Instructions
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. Failure 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 se-
vere 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 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 potential-
ly 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 instruc-
tions contained in this manual may result in
personal injury or damage to equipment or prop-
erty.
If you have any questions concerning setup, opera-
tion, maintenance, or safety, please contact your
authorized Walker Mower dealer or call Walker Man-
ufacturing Company at [phone].
BEFORE OPERATING
1. Read and understand the contents of this
Operator’s Manual before starting and oper-
ating 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. Keep everyone, especially children and pets, a
safe distance away from the area of operation.
Do not operate with bystanders in the area.
4. Do not operate the machine barefoot or wearing
sandals, sneakers, tennis shoes, or similar
lightweight footwear. Wear substantial protec-
tive footwear.
5. 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.

6
Safety Instructions
6. Prolonged exposure to loud noise can cause
impairment or loss of hearing. Operator hear-
ing protection is recommended. Wear a suit-
able hearing protective device, such as earmuffs
or earplugs.
7. Keep all protective shields and safety devic-
es in place. If a protective shield, safety de-
vice, or decal is damaged, unusable, or missing,
repair or replace it before operating the ma-
chine.
8. 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, the PTO clutch is in
the DISENGAGED position, and the Parking
Brake is in the ENGAGED position. Also, the
engine should stop if the operator lifts off the
seat with any one or more of these controls in
the operating position: (1) Forward Speed
Control (FSC) out of NEUTRAL-PARK, (2) PTO
Clutch ENGAGED, or (3) Parking Brake DISEN-
GAGED.
9. 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.
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 spill-
ing.
e. Replace the machine fuel cap and container
cap securely and clean up any spilled fuel
before starting the engine.
10. Never attempt to make any adjustments
while the engine is running, except where
specically instructed to do so.
11. 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.
12. Before operating an implement, become familiar
with the location and function of all operator
controls. Knowing the location, function, and
operation of these controls is important for safe
and efcient operation.
OPERATING
1. Operate the machine only in daylight or in
good articial light with good visibility of the area
being bladed.
2. Sit on the seat when starting the engine and
operating the machine. Keep feet on the deck
or implement footrests at all times when the
tractor is moving and/or the implement is oper-
ating. Never 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 implement operation.
Be aware that, with the front mounted imple-
ment conguration, the back of the tractor
swings to the outside during turns.
DANGER
Do not operate 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.
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 maintain control, immediately (1)

7
Safety Instructions
Release the steering levers and simultaneously
(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 normal-
ly 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 start-
ing 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 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 immedi-
ately.
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. 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 trafc when crossing or working near road-
ways.
11. When moving forward, do not suddenly put the
tractor in reverse by rapidly pulling on the steer-
ing 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.
DANGER
Do not operate tractor within 5 feet (1.5 me-
ters) of an embankment or retaining wall
with drop off.
12. The maximum recommended slope operat-
ing angle in dry conditions is 15 degrees or
27% 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 de-
grees.
13. The maximum recommended slope operat-
ing angle in snow or ice conditions is 5
degrees or 9% grade. Do not operate the
machine on a snow or ice-covered slope great-
er than 5 degrees.
14. Operating the machine on snow or ice-covered
slopes decreases safety. It is the operator’s
responsibility to determine what conditions
are safe for operation.
15. 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.
16. When leaving the machine unattended, disen-
gage the blade clutch (PTO), engage the
parking brake, stop the engine, and remove
the key.
17. If a PTO-driven implement strikes a solid object
or the machine begins to vibrate abnormally,
immediately disengage the PTO clutch,
engage the parking brake, stop the engine,
and wait for all moving parts to stop. Discon-
nect the spark plug wire(s) to prevent acciden-
tal starting. Thoroughly inspect the implement
and repair any damage before restarting the
engine and operating the machine. Make sure
implement components are in good condition
and all bolts are tight.
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, have it repaired by an authorized
dealer immediately.

8
Safety Instructions
18. Using the trip-over lock is NOT recommended
when obstructions cannot be seen (e.g. under
snow cover). The rigid blade operation should
only be used with low ground speed.
19. Do not over loosen the articulation joint. Doing
so could cause the blade to fall off during use
causing damage to the blade or property.
20. Do not lock the articulation joint at an angle
other than parallel to the ground. Doing so
could cause signicant damage to the blade or
property.
MAINTENANCE
NOTE: Refer to your tractor Operator’s Manual for
safety instructions for tractor maintenance.
IMPORTANT: Keep all applicable manuals immedi-
ately accessible to anyone who may operate or
service this machine.
1. To prevent accidental starting of the engine
when servicing or adjusting the machine, re-
move the key from the ignition switch and
disconnect the spark plug wire(s).
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
described in this manual. Unauthorized
maintenance operations or machine modica-
tions may result in unsafe operating conditions.
5. If the engine must be running to perform a
maintenance adjustment, keep hands, feet,
and clothing away from moving parts. Do not
wear jewelry or loose clothing.
6. Always use the proper engine service man-
ual when working on the engine. Unautho-
rized 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 affects its operation,
performance, durability, or use will VOID the
warranty and may cause hazardous condi-
tions.
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 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 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.
c. Keep sparks, ames, and smoking materi-
als away from the battery at all times. To
avoid sparks, use care when removing
battery cables from posts.
d. Disconnect both battery cables before
unplugging any wiring connectors or mak-
ing repairs on the electrical system.
12. DO NOT allow the cutting edge to become
worn beyond the wear zone which can result in
damage to the dozer blade.

Assembly and Installation
9
Assembly and Installation
ASSEMBLING THE BLADE
1. Lay the dozer blade on a at surface and re-
move the pivot shaft from the back of the blade
using a hammer and a punch.
Remove Pivot Shaft
2. Align the pivot shaft sockets on the blade
mount and dozer blade. Feed the pivot shaft
through the sockets from left to right. Use a
hammer to tap the pivot shaft in place, making
sure to align the roll pin holes on the LH side.
The pivot shaft should t very snug in the sock-
ets.
Feed Pivot Shaft Through Sockets
3. After ensuring proper alignment of the roll pin
holes, use a hammer and a punch to tap the
roll pin into place.
NOTE: If needed, tap the pivot shaft back
through the left pivot shaft socket approximate-
ly one inch and, using pliers, rotate the pivot
shaft to more closely align the roll pin holes.
Tap the pivot shaft back into place and insert a
tapered punch into the roll pin holes to maneu-
ver the pivot shaft into alignment.
Insert Roll Pin
4. Loop the extension spring through the spring
mount tab in the center of the blade mount.
5. Loop the eye bolt over the other end of the
extension spring and pull up on the extension
spring so that the threads of the eye bolt pro-
trude through the eye bolt bracket.
Install Extension Spring
6. Place the washer (P/N F481) over the eye bolt
and begin threading the ESNA nut (P/N F020)
onto the eye bolt. Tighten until the spring is
under tension using 1/2” wrench.
NOTE: Eye bolt threads need to protrude
through the ESNA nut by atleast1/2in.(1.3
cm). See Trip-Over Extension Spring on
page 18 for additional notes on the exten-
sion spring.

Assembly and Installation
10
At least 1/2”
Eye Bolt Threads
7. Put the lift handle in place, as demonstrated in
the photo and insert two (2) 5/16-18 x 2 hex
bolts (P/N F275) through the lift handle. Install
the accompanying whiz lock nuts (P/N F009)
and tighten them with a 1/2” wrench.
Install Lift Handle
8. Align the clevis over the locking arm and insert
the clevis pin. With the clevis pin in place,
check that the lift release push button stands
3/8” above the lift handle. Adjust the clevis or
button position on the threaded rod until the
push button is positioned as shown.
Clevis Pin
Align Clevis
3/8”
Check Lift Release Push Button
9. Insert the cotter pin into the clevis pin opening,
using needle nose pliers to bend the cotter pin
to secure the clevis pin.
Cotter Pin
Secure Clevis
10. Mount the 5A Fuse Harness (P/N 1940-1)
using the 10-24 x 5/8 PPHMS (P/N F027) and
10-24 keps nut (P/N F002) provide.
Mount 5A Fuse Harness

Assembly and Installation
11
INSTALLING THE DOZER BLADE
1. Remove the Blade Drive Belt (PTO) from the
tractor. See the Service section of the MR21
Operator’s Manual for details.
2. Remove the extension spring between the
tensioner mount assembly and the tensioner
arm. Reserve the spring for reinstallation.
3. Using an 11/16 in. wrench, remove the nuts
that secure the counterweight springs on each
side of the carrier frame.
Remove Nut from Carrier Frame
4. With the assistance of a second person, lift the
deck using the deck tilt bar and slide the coun-
terweight springs off the deck carrier frame.
Remove Counterweight Spring
5. Remove the counterweight springs from the
tractor posts and reserve the springs for future
deck reinstallation.
6. Push down on the deck lock levers to release
the deck pivot hinges. Remove the carriage
bolt from each side. Reserve the carriage bolts
and the nuts for deck reinstallation.
Push Down
to Unlock
Unlock Deck Lock Levers
7. Slide the deck away from the tractor and safety
stow the deck with the belt for future deck
reinstallation.
8. Lift the seat panel and disconnect the deck
safety harness from the main tractor harness.
Safety
Harness
Connection
Disconnect Safety Harness
9. Using a 9/16 in. wrench, remove the tensioner
arm assembly from the LH idler mount. Main-
tain the hardware order by storing the arm with
the hardware on the bolt for easier reinstalla-
tion.
Tensioner
Arm
Remove Tensioner Arm

Assembly and Installation
12
10. Use a jack to block up the tractor a few inches
off the ground
Block Up Tractor
11. Remove the drive tires using a 3/4” socket for
the mounting nuts.
Drive Tires Removed
12. Using a 5/8” wrench and an 11/16” wrench,
remove both deck support arms and reserve all
the mounting hardware with the deck support
arms for later reinstallation of the deck.
Remove Deck Support Arms
13. Tractors prior to S/N 2022-176529 may need
to add support strap mounting holes. Locate
and drill the support strap mounting holes using
the MR Chassis Drill Guide provided if needed.
Align the edge of the guide with the edge of the
chassis before clamping it into place.
CLAMP TEMPLATE PLATE
DRILL 1/8” Ø PILOT HOLES
THEN DRILL 5/16” Ø HOLES
REPEAT ON OPPOSITE SIDE
Drill Support Strap Mounting Holes
14. Slide the dozer blade carefully into position.
Position Dozer Blade

Assembly and Installation
13
15. Using a 5/8” wrench and an 11/16” wrench
mount the blade on each side. The 7/16-20 x
1-1/2 hex bolts (P/N F632) should be posi-
tioned with the 7/16-20 ange top lock nuts
(P/N F621) on the inside of the chassis. Fully
tighten the nuts.
Install the Blade
16. Using a jack, lift and secure the blade so it sits
level with the tractor body.
WARNING
To avoid injury, be cautious when lifting and
maneuvering the blade into position. Two
people are recommended for this step.
18. Install the support straps as shown using a 1/2”
wrench to secure the 5/16-18 x 3/4 hex bolt
(P/N F034) and 5/16-18 whiz locknut (P/N
F009) on the top and the 5/16-18 x 7/8 Hex
Bolt (P/N F026) with another F009 on the bot-
tom.
Inside the
Chassis
Outside
the Blade
Support Strap Installed
19. Lift the seat panel and connect the 5A Fuse
Harness to the main harness where the safety
harness was previously disconnected.
20. Reinstall the drive tires. Torque mounting nuts
to 75-85 lb·ft (102 to 115 N·m). Lower the
tractor back onto the drive tires.
21. Install the MRTailWeightKit(P/N1647-10)
using the instructions provided with the kit.
Counter Weights Installed

Assembly and Installation
14
22. Check operation of the lift release push button
on the top of the lift handle. If additional travel
is needed, loosen the jam nut on the clevis and
rotate the rod until the desired length is
achieved. Re-tighten the jam nut.
Lift Release Push Button
Jam Nut
Adjust Rod Length for Additional Travel
23. Check the adjustment of the angle stop bolts
with the blade in the fully angled position in
both directions. Conrm that the mechanism
engages freely in the angle adjust slot while the
angle stop bolt is contacting the side of the
attachment frame tongue. Adjust as necessary.
Angle
Stop Bolt
Angle Stop Bolts
Locking Tang
Foot Trigger
Locking Tang and Foot Trigger

Assembly and Installation
15
REMOVING THE DOZER BLADE
1. Use a jack to block up the tractor a few inches
off the ground
Block Up Tractor
2. Remove the drive tires using a 3/4” wrench for
the mounting nuts.
3. Disconnect the 5A Fuse Harness from the main
harness.
Safety
Switch
Harness
Disconnect 5A Fuse Harness
4. Using a jack, lift and secure the blade so it sits
level with the tractor body.
5. Remove the support straps using 1/2” wrench.
Reserve the hardware with the straps for rein-
stallation. Lower the blade to a ground.
Remove Support Strap
6. Using a 5/8” wrench and an 11/16” wrench,
remove the blade mounting hardware, and pull
the blade away from the tractor. Reserve the
hardware with the blade for reinstallation.
Remove the Blade

Assembly and Installation
16
7. Using a 5/8” wrench and an 11/16” wrench,
reinstall the deck support arms using the re-
served hardware as shown in the Deck Sup-
port Arms (LH Shown) illustration. Fully tight-
en the nuts.
F350
F632
F009
LH DECK
SUPPORT ARM
5840-3
F194
F621
Deck Support Arms (LH Shown)
Reinstall Deck Support Arms
8. Using a 9/16 in. wrench, reinstall the tensioner
arm on the LH twin idler mount. Use the Rein-
stall Tensioner Arm illustration to ensure the
hardware is in the correct order. Fully tighten
the F013 locknut.
TENSIONER
ARM
7201-3 7201-4
5841
LH TWIN IDLER
MOUNT
F393
F051
V-GROOVE
IDLER
IDLER
PULLEY
F013
7201-3 5841
F051
Reinstall Tensioner Arm
9. Reinstall the extension spring between the
tensioner mount assembly and the tensioner
arm.
10. Lift the seat panel and reconnect the deck
support arm safety harness to the main tractor
harness.
11. Reinstall the drive tires. Torque mounting nuts
to 75-85 lb·ft (102 to 115 N·m). Lower the
tractor back onto the drive tires.
12. Reinstall the deck. Follow the instructions in
the MR21 Operator’s Manual.
13. Reinstall the Blade Drive Belt (PTO). See the
Service section of the MR21 Operator’s Manual
for details.

Operating Instructions
17
Operating Instructions
The A44 Dozer Blade has a variety of different
features that help make it adaptable to different
conditions. These features include: lifting and low-
ering the blade, angling the blade, the action of the
extension/trip spring, the trip lock, and the articula-
tion of the blade. All the operations of these con-
trols are detailed in this section.
IMPORTANT: Only operate the A44 Dozer Blade
with the MRTailWeightKit(P/N1647-10)
installed. Failure to do so could cause the rear of
the tractor to rise during operation.
LIFT/LOWER BLADE
To lift the dozer blade, pull back on the lift handle.
The blade can be placed in two (2) raised posi-
tions:
●First position: approximately 2.5” (6.35cm)
above the ground
●Second position: approximately 6.5” (16.51cm)
above the ground
To lower the dozer blade, pull back slightly on the
lift handle; push and hold the push button on top of
the lift handle to prevent the locking arm from
engaging. Then, lower the blade to the desired
position.
Pull Back to
Raise the Blade
or Push and
Hold the Button
To Lower It
Lift or Lower the Blade
NOTE: Do NOT operate the tractor at full speed
with the blade in a raised position. Abrupt braking
may cause the rear of the tractor to rise.
Adjusting the Lift Handle Assist Spring
The lift handle is equipped with an assist spring
that aids in the raising and lowering of the blade.
To increase the lift assistance, lift the seat panel
and tighten the eye bolt nut that secures the spring
in the rear.
To reduce the lift assistance, lift the seat panel and
loosen the eye bolt nut that secures the spring in
the rear.
Tighten to
Increase Lift
Assistance
Lift Handle Assist Spring
BLADE ANGLE
There are ve angle positions to which the blade
can be adjusted:
●Straight forward
●Right/Left 15 degrees
●Right/Left 30 degrees
Positions
Angle Positions
To adjust the blade angle, use one foot to hold
down the foot trigger and use the other foot (or the