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Walker A44 Assembly Instructions Operator's Manual

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

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  • Page 1 A44 Dozer Blade Attachment Operator’s Manual Assembly, Attaching, Removing, Operation, and Maintenance Compatible with Models: MR21 Please Read and Save These Instructions For Safety, Read All Assembly and Operation Instructions Beginning S/N: 2022-1807 Prior to Operating Attachment P/N: 6625-16...
  • Page 2 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 satisfied customers. If for any reason this product does not perform to your expectations, please contact your local dealer.

  • Page 3: Table Of Contents

    Table of Contents Parts Lists and Diagrams A44 Dozer Blade Parts List ..... 22 General Information A44 Dozer Blade Parts Diagram ....23 Highlighted Information.

  • Page 4: General Information

    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 Dozer Blade Serial No.

  • Page 5: Servicing Of The Dozer Blade

    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°...

  • Page 6: Specifications

    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 ●...

  • Page 7: Component Identification

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

  • Page 8: Safety Instructions

    If you have any questions concerning setup, opera- tion, maintenance, or safety, please contact your An IMMEDIATE hazard that WILL result in se- authorized Walker Mower dealer or call Walker Man- vere personal injury or DEATH, if warning is ufacturing Company at (970) 221-5614.

  • Page 9: Operating

    Safety Instructions Prolonged exposure to loud noise can cause WARNING impairment or loss of hearing. Operator hear- ing protection is recommended. Wear a suit- This product can expose you to chemicals able hearing protective device, such as earmuffs including Di-(2-ethylhexyl) phthalate which or earplugs.
  • Page 10 Safety Instructions Release the steering levers and simultaneously DANGER (2) Move the FSC to the NEUTRAL-PARK position. When the machine is stopped or Do not operate tractor within 5 feet (1.5 me- moving slowly, engage the parking brake. ters) of an embankment or retaining wall NOTE: The emergency stop procedure is with drop off.

  • Page 11: Maintenance

    Safety Instructions 18. Using the trip-over lock is NOT recommended Never attempt to disconnect any safety devices when obstructions cannot be seen (e.g. under or defeat the purpose of these safety devices. snow cover). The rigid blade operation should Do not change the engine governor settings or only be used with low ground speed.

  • Page 12: Assembly And Installation

    Assembly and Installation Assembly and Installation ASSEMBLING THE BLADE Lay the dozer blade on a flat surface and re- move the pivot shaft from the back of the blade using a hammer and a punch. Insert Roll Pin Loop the extension spring through the spring mount tab in the center of the blade mount.
  • Page 13 Assembly and Installation 3/8” At least 1/2” Eye Bolt Threads Check Lift Release Push Button Put the lift handle in place, as demonstrated in Insert the cotter pin into the clevis pin opening, the photo and insert two (2) 5/16-18 x 2 hex using needle nose pliers to bend the cotter pin bolts (P/N F275) through the lift handle.

  • Page 14: Installing The Dozer Blade

    Assembly and Installation INSTALLING THE DOZER BLADE Push Down Remove the Blade Drive Belt (PTO) from the to Unlock tractor. See the Service section of the MR21 Operator’s Manual for details. Remove the extension spring between the tensioner mount assembly and the tensioner arm.
  • Page 15 Assembly and Installation 10. Use a jack to block up the tractor a few inches 13. Tractors prior to S/N 2022-176529 may need off the ground to add support strap mounting holes. Locate and drill the support strap mounting holes using the MR Chassis Drill Guide provided if needed.
  • Page 16 Assembly and Installation 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 flange top lock nuts (P/N F621) on the inside of the chassis. Fully tighten the nuts.
  • Page 17 Assembly and Installation 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 Locking Tang achieved.

  • Page 18: Removing The Dozer Blade

    Assembly and Installation REMOVING THE DOZER BLADE Use a jack to block up the tractor a few inches off the ground Remove Support Strap Using a 5/8” wrench and an 11/16” wrench, remove the blade mounting hardware, and pull Block Up Tractor the blade away from the tractor.
  • Page 19 Assembly and Installation Using a 5/8” wrench and an 11/16” wrench, Reinstall the extension spring between the reinstall the deck support arms using the re- tensioner mount assembly and the tensioner F350 served hardware as shown in the Deck Sup- arm.

  • Page 20: Operating Instructions

    Adjusting the Lift Handle Assist Spring The lift handle is equipped with an assist spring The A44 Dozer Blade has a variety of different that aids in the raising and lowering of the blade. features that help make it adaptable to different conditions.

  • Page 21: Trip-Over Extension Spring

    Operating Instructions TRIP-OVER EXTENSION SPRING momentum of the blade as you turn the tractor) to push the blade into the desired position. Release The dozer blade is designed to “trip” forward when the foot trigger to allow the locking tang to snap striking large rocks, tree stumps, etc.

  • Page 22: Blade Articulation

    Operating Instructions BLADE ARTICULATION Be sure the trip lock seats flush on the stop rod as shown in the Trip Lock Seated on Stop Rod The dozer blade is designed with +/- 5 degrees of photo. This procedure locks the blade in place and lateral articulation to allow the blade to follow the will prevent the forward trip action.

  • Page 23: Blade Articulation Lock

    Operating Instructions Then lower the blade, and it should easily self level to make full contact with the ground as it is lowered. Flat Surface Blade Contacting the Ground Blade Articulation Lock The blade articulation can be locked to render the blade fixed.

  • Page 24: Maintenance

    Maintenance Maintenance LUBRICATION Lubricate the following oil points every 25 hours of CUTTING EDGE (WEAR STRIP) operation: Inspect cutting edge often (approximately every 2 Blade Angle Pivot (Grease) hours of operation). Upon reaching the maximum allowable wear (approximately 1/8” remaining) either Foot Trigger Pivot (SAE 10 Oil) lower cutting edge to the second row of carriage bolt Lift Bar Pivot (x2) (Grease)

  • Page 25: Parts Lists And Diagrams

    Parts Lists and Diagrams A44 DOZER BLADE PARTS LIST ITEM PART DESCRIPTION ITEM PART DESCRIPTION REQ’D REQ’D Dozer Blade Fasteners F002 10-24 Keps Nut 6622-19 Pivot Shaft (8") F003 1/4-28 Hex Nut 6622-20 Tongue Weldment F009 5/16-18 Whiz Locknut 6621-21...

  • Page 26: A44 Dozer Blade Parts Diagram

    A44 DOZER BLADE PARTS DIAGRAM F034 F009 F002 F632 F621 F003 F621 F275 F226 F009 F020 F049 F632 F009 F255 F027 F009 F009 F009 F034 F009 F003 F020 F069 F226 F436 F055 F676 F111 F009 F055 F678 F016 F645 F170...
  • Page 27 (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.
  • Page 28 WALKER MFG. CO. • 5925 E. HARMONY ROAD, FORT COLLINS, CO 80528 • (970) 221-5614 FORM NO. 110922 PRINTED IN USA www.walker.com ©2022 WALKER MFG. CO...

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