MTD "A" Series Professional Shop Manual
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MTD "A" Series Professional Shop Manual

MTD "A" Series Professional Shop Manual

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Professional Shop Manual
"A" and "B" Series Mowers
NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperi-
enced individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all
instructions and use common sense when working on power equipment. This includes the contents of the product's Oper-
ators Manual, supplied with the equipment. No liability can be accepted for any inaccuracies or omission in this publication,
although care has been taken to make it as complete and accurate as possible at the time of publication. However, due to
the variety of outdoor power equipment and continuing product changes that occur over time, updates will be made to these
instructions from time to time. Therefore, it may be necessary to obtain the latest materials before servicing or repairing a
product. The company reserves the right to make changes at any time to this publication without prior notice and without
incurring an obligation to make such changes to previously published versions. Instructions, photographs and illustrations
used in this publication are for reference use only and may not depict actual model and component parts.
© Copyright 2010 MTD Products Inc. All Rights Reserved
MTD Products Inc - Product Training and Education Department
FORM NUMBER - 769-05615A
03/2010

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Summary of Contents for MTD "A" Series

  • Page 1 Instructions, photographs and illustrations used in this publication are for reference use only and may not depict actual model and component parts. © Copyright 2010 MTD Products Inc. All Rights Reserved MTD Products Inc - Product Training and Education Department...

  • Page 3: Table Of Contents

    Chapter 1: Introduction ......................1 About the text format ........... .1 Safety .

  • Page 5: Chapter 1: Introduction

    • Common sense in operation and safety is assumed. • In no event shall MTD be liable for poor text interpretation, or poor execution of the procedures described in the text. • If the person using this manual is uncomfortable with any procedures they encounter, they should seek...

  • Page 6: Safety

    A and B series mowers Safety This Service Manual is meant to be used along with the Operator’s Manual. Read the Operator’s Manual and familiarize yourself with the safety and operational instructions for the equipment being worked on. Keep a copy of the Operator’s Manual for quick reference.

  • Page 7: Fasteners

    Introduction Fasteners • The fasteners used on the equipment described in this manual, and the engine that powers it are a combi- nation of metric and fractional inch. For this reason, wrench sizes are frequently identified in the text, and measurements are given in U.S.

  • Page 8: The "A" Series Mower

    A and B series mowers The “A” series mower The “A” series mower is a 21” platform introduced for the 2010 season. The “A” series is produced in a variety of configurations. • A push version. • A front wheel drive single speed version. •...

  • Page 9: Understanding Model And Serial Numbers

    Please contact the designated support office in your area or our corporate offices directly should further service information be needed. MTD Products LLC P.O. Box 368022 Cleveland, OH 44136 Telephone: (800) 800-7310 www.mtdproducts.com...

  • Page 10: Maintenance Chart

    Drain or preserve fuel Before prolonged storage Fog or lube cylinder Before prolonged storage Rotate engine to TDC Before prolonged storage NOTE: Refer to the engine manufacturer’s manual for complete engine service information. MTD engines are covered by form #769-03354A.

  • Page 11: Chapter 2: Blade And Belt

    See Figure 2.1. Block the blade from rotating using a block of wood or a blade holder tool. NOTE: MTD blade holding tool, part number 490-850- 0005, can be used block the blade. See Figure 2.1. Figure 2.1...
  • Page 12 Install the blade with the blade adapter and Belleville spring washer properly positioned. Tighten the blade bolt to a torque of 38-50 ft.-lb. (51-68 Nm). NOTE: OEM blades manufactured by MTD are stamped with the part number and the word “BOTTOM”. The word bottom should face...

  • Page 13: Blade Sharpening

    ! CAUTION cause excessive vibration and may cause damage to the mower and result in personal injury. NOTE: MTD blade balancer AR-SBB-102 or the blade bal- ancing kit, AR-BSK-1 can be used to balance the blade. See Figure 2.5. AR-BSK-1 AR-SBB-102 Figure 2.5...

  • Page 14: Belt Removal/Replacement

    A and B series mowers Belt removal/replacement The single speed and the variable speed mowers use the same transmission. When the drive control bail is oper- ated, it pulls on the drive cable. As the drive cable starts to pull the clutch lever on the transmission, it engages the clutch.
  • Page 15 Blade and Belt Slip the belt over the crank shaft. See Figure 2.8. Belt Figure 2.8 Remove the seven screws that hold the transmission cover to the mower. See Figure 2.9. 7 screws Figure 2.9 Remove both front wheels. 10. Remove the two screws on each side that holds the belt cover to the front sub frame.
  • Page 16 A and B series mowers Unhook the wire form belt guide from the post on the transmission. Lift the belt guide off of the transmission. Remove the belt. Install a new belt by following the previous steps in reverse order. Test run the mower in a safe area before returning it to service.

  • Page 17: Chapter 3: Cables

    Cables CHAPTER 3: CABLES Engine Control Cable The engine control cable operates the engine brake. When the bail is pulled against the handle bar, the engine control cable pulls the engine brake pad away from the flywheel releasing the brake. The engine brake has an igni- tion switch built into it.

  • Page 18: Drive Control Cable (Variable Speed)

    A and B series mowers Slide the inner cable through the slot. Z-fitting See Figure 3.4. Slot Unhook the Z-fitting from the blade brake and dis- card the old cable. Install by following the previous steps in reverse order. Test run the mower before returning it to service. Figure 3.4 Drive Control Cable (variable speed) To remove/replace the traction control cable:...
  • Page 19 Cables Work the barrel end of the cable out of the slot on the front sub-frame. Barrel end Slot Front sub-frame Figure 3.6 Remove the four screws that fasten the lower handle cover to the upper handle cover. Disconnect the barrel end of the cable. Align the cable with the slot on the control lever and slide it out.

  • Page 20: Drive Cable Adjustment (Variable Speed)

    A and B series mowers Drive cable adjustment (variable speed) To adjust the drive cable: Start the engine. NOTE: If the mower starts to drive without touching Thumb wheel the drive control lever, the drive cable is too tight. Squeeze the drive control lever. NOTE: If the drive speed is too slow, the drive cable can be tightened.

  • Page 21: Drive Control Cable (Single Speed)

    Cables Drive Control Cable (single speed) To remove/replace the traction control cable: Squeeze tabs together Disconnect the spark plug wire and ground it to an engine bolt. Drain the fuel from the gas tank into an approved con- tainer. Tip the mower up to gain access to the underside of the deck.
  • Page 22 A and B series mowers...

  • Page 23: Chapter 4: Wheels, Non-Drive Axles And Doors

    Wheels, non-drive axles and doors CHAPTER 4: WHEELS, NON-DRIVE AXLES AND DOORS Wheels All of the wheels (drive and non drive) are held on with a nylock lock nut. To remove/replace the wheel: Lift and safely support the mower. Remove the nut with a 1/2” wrench. See Figure 4.1. Slide the wheel off of the axle.

  • Page 24: Trail Shield

    A and B series mowers Trail shield Never operate a mower without the trail shield. It is a safety feature that is required by law. ! CAUTION ! CAUTION The trail shield is designed to drag on the ground behind the mower. This helps keep the oper- ator from getting their feet under the mowing deck.

  • Page 25: Rear Discharge Door

    Wheels, non-drive axles and doors Rear discharge door To remove/replace the rear discharge door: Remove the rear bagger (if installed). Grab the pivot rod with a pair of needle nose pliers. Slide it to the right (towards the height adjuster). See Figure 4.5.
  • Page 26 A and B series mowers Set the door on the rear sub-frame. Hook the end of the left torsion spring onto the rear sub-frame. Press the door down on the right side. Hook the right torsion spring onto the sub frame. Spring Rear sub-frame Figure 4.8...

  • Page 27: Chapter 5: Transmission Removal

    Transmission CHAPTER 5: TRANSMISSION REMOVAL To remove/replace the transmission: Remove the blade and belt by following the proce- dures described in Chapter 2: Blade and Belt. Disconnect the drive control cable from the transmis- sion by following the steps described in Chapter 3: Cables.
  • Page 28 A and B series mowers Dowel pin 3d. Remove the dowel pin that drives the spur gear. See Figure 5.3. NOTE: There is a lip on one end of the dowel pin. The pin must be removed from that end. Remove the dust shield.
  • Page 29 Transmission Slide the longer end of the transmission output shaft through the shaft support of the axle. When the shorter end of the shaft clears the second shaft sup- port, remove the transmission from the axle. See Figure 5.6. Install the transmission by following the previous steps in reverse order.

  • Page 30: Drive Bushings

    A and B series mowers Drive bushings To remove/replace the drive bushings: Disconnect and ground the spark plug wire. Drain the fuel into an approved container. Tip the mower with the muffler side down, or tilt the mower back on a work bench, with the front wheels Remove the belt cover by following the steps Transmission described in Chapter 2: Blade and Belt.
  • Page 31 Transmission Dowel pin Remove the dowel pin that drives the spur gear. See Figure 5.9. NOTE: There is a lip on one end of the dowel pin. The pin must be removed from that end. Remove the dust shield. Dust shield Figure 5.9 Pry out the drive bushings.
  • Page 32 A and B series mowers...

  • Page 33: Chapter 6: Electric Start

    Electric start CHAPTER 6: ELECTRIC START Some model of the “A” and “B” series mower have an electric start engine. The starter and the pigtail connector are part of the engine. See the engine manufacturer service information on those components. The battery, key switch and the harness going to the engine will be covered in this chapter.

  • Page 34: Battery Testing

    A and B series mowers Battery testing To load test a battery: Fully charge the battery (24 hour charge). Move the mower to a safe area. Battery box Take the cover off of the battery box. See Figure 6.3. Disconnect the spark plug wire. NOTE: Do not remove the spark plug.

  • Page 35: Battery Removal

    Electric start Battery removal To remove/replace the battery: Take the cover off of the battery box. See Figure 6.6. Battery box Figure 6.6 Disconnect positive and negative battery leads. Positive lead See Figure 6.7. Slide the charger port out of the battery box. Lift the harness out of the way.

  • Page 36: Fuse

    A and B series mowers Fuse The “A” and “B” series mowers with electric start are equipped with a 40 amp ATO automotive blade type fuse. The fuse is located in the battery box, on top of the battery. See Figure 6.9. Fuse Figure 6.9 Key switch...

  • Page 37: Wiring Harness

    Electric start Wiring harness To remove/replace the harness: Key switch Disconnect the harness from the key switch. NOTE: The harness is a tight fit. It may be necessary to remove the key switch to get enough leverage to unplug it. Cut off the wire ties that hold the harness to the han- dle bars.

  • Page 38: Schematic

    A and B series mowers Schematic Figure 6.15...

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"b" series

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