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MTD 31AE5MLG729 Service Manual

Two-stage snow thrower
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Service Manual
31AE5MLG729 Two-Stage Snow Thrower
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 inexperienced
individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all instructions
and common sense when working on power equipment. This includes the contents of the product's Operators 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 2005 MTD Products Inc. All Rights Reserved.
MTD Products LLC - Product Training and Education Department
FORM NUMBER 769-01418
9/2004

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Summary of Contents for MTD 31AE5MLG729

  • 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 2005 MTD Products Inc. All Rights Reserved. MTD Products LLC - Product Training and Education Department...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS General Information ...1 Tire Pressure ...2 Chute Installation ...2 Skid Shoe and Shave Plate Adjustment ... 2 Shave Plate Adjustment ... 3 Drive Control Cable Adjustment ... 3 Auger Control Testing and Adjustment ... 4 Shift Rod Adjustment ... 5 Auger Belt Replacement ...

  • Page 5: General Information

    31AE5MLG729 Snow Thrower 31AE5MLG729 YARD MACHINES SNOW THROWER Model 31AE5MLG729 • Serial Number 1G024B10168 • Two Stage – 4 Cycle HMSK80-110 – 10.5 HP • 28” Xtreme Auger • 21” Intake Height • Tecumseh Engine With Electric Start • Power Steering •...

  • Page 6: Tire Pressure

    There is a storage area in the handle panel used for holding the spare auger shear pins. See Figure 2. Shear Pins Storage Area Figure 2 TIRE PRESSURE Before operating, check tire pressure. Both tires should be between 15 psi and 20 psi. NOTE: If the tire pressure is not equal in both tires, the unit may pull to one side or the other during operation.

  • Page 7: Shave Plate Adjustment

    shave plate. Use a middle or lower position when the area to be cleared is uneven, such as a gravel driveway. CAUTION: Loose gravel can be picked up and thrown by the auger, causing injury to the opera- tor and bystanders and/or damage to the snow thrower and surrounding property.

  • Page 8: Auger Control Testing And Adjustment

    5.4. Loosen the hex jam nut on the auger control cable "Z" fitting and rotate the coupling end of the cable downward to provide more slack or upward to take up slack. See Figure 8. Hex Jam Nut Figure 8 5.5.

  • Page 9: Shift Rod Adjustment

    When replacing pins, spray an oil lubricant into shaft before inserting new pins. SHIFT ROD ADJUSTMENT If the full range of speeds (forward and reverse) cannot be achieved, adjust the shift rod. 7.1. Place the shift lever in the fastest forward speed position and remove the hairpin clip which secures the ferrule to the shift lever.

  • Page 10: Drive Belt Replacement

    8.6. Using a 3/8” socket, remove the four self-tapping screws which secure the frame cover to the frame. See Figure 15. Self Tapping Screws Figure 15 8.7. Using a piece of starter cord, unhook the support bracket spring from the frame. See Figure 16. Support Bracket Spring Starter Cord Figure 16...
  • Page 11 FRICTION WHEEL REMOVAL If the snow thrower fails to drive with the drive control engaged, and performing the drive control cable adjustment fails to correct the problem, the friction wheel may need to be replaced. 10.1. Examine the friction wheel for signs of wear or cracking and replace if necessary.

  • Page 12: Planetary Gear Removal

    10.9. Holding the friction wheel assembly, slide the hex gear shaft to the right. See Figure 22. Drift Punch Friction Wheel Assembly Figure 22 NOTE: It may be necessary to use a drift punch on the left side of the shaft to drive it from the bearing.

  • Page 13: Drive Shaft Removal

    11.2. Using a 3/8” socket, remove the shaft retainer cover. See Figure 25. Shaft Retainer Cover Figure 25 11.3. Remove the ball bearing and flat washer. 11.4. Using snap ring pliers, remove the retaining ring. See Figure 26. Retaining Ring Figure 26 11.5.

  • Page 14: Axlw Shaft Removal

    12.3. Remove the right planetary gear cluster from the drive shaft. See Figure 29. Planetary Gear Cluster Washer Figure 29 12.4. Slide the drive shaft to the right while holding the left planetary gear cluster in place. See Figure Drive Shaft Figure 30 12.5.

  • Page 15: Splitting The Unit

    13.7. Slide the right axle to the right and remove the gear, shim washer and hex flange bearing from the axle as you remove it. See Figure 33. Axle Support Tube Figure 33 13.8. Slide the left axle to the left and remove the axle support tube, gear, shim washer and hex flange bearing as you remove it.
  • Page 16 14.5. Use needle nose pliers to remove the hairpin clip from the clevis pin securing the 4-way chute control assembly to the chute support tube. Remove the clevis pin. See Figure 36. 4-Way Chute Control Figure 36 14.6. Remove the control assembly and set it on the engine.

  • Page 17: Friction Wheel Disc Disassembly

    14.11. Separate the two halves of the unit. See Figure Figure 40 NOTE: As you separate the housing halves, remove the extension spring from the auger idler bracket. CAUTION: After the unit is split, place wood blocks at the rear of the wheel drive frame to support it and keep it from tipping back.

  • Page 18: Auger Pulley Removal

    NOTE: During reassembly note that there are two mounting holes in the friciton wheel support bracket. The friciton wheel disc must be installed in the left hand hole as you face the friction wheel support bracket. See Figure 44. Assemble in left mounting hole Figure 44 AUGER PULLEY REMOVAL 16.1.

  • Page 19: Auger And Impeller Notes

    17.4. Using a 1/2 “ socket, remove the four (two on each side) hex screws securing the auger assembly to the auger housing. See Figure 47. Hex Screws Figure 47 17.5. Carefully tip back and remove the housing from the auger assembly. See Figure 48. Figure 48 AUGER AND IMPELLER NOTES •...

  • Page 20: Reducer Transmission

    REDUCER TRANSMISSION 18.1. The reducer can be serviced. It can also be pur- chased as an assembly. NOTE: On the top of the gearbox is inspection and access hole for adding grease when and if required. Remove the rubber grommet from the lubrication port.
  • Page 21 20.3. Align one of the holes in the impeller with the idler arm nut on the front of the auger housing. See Figure 54. Alignment Hole Figure 54 20.4. Using a 9/16’ socket on a long extension and a 15/16” socket on a ½’ socket wrench, remove the nut and shoulder screw attaching the idler to the auger housing.

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