MTD 31AE5MLG729 User Manual
Service Manual
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.
31AE5MLG729 Two-Stage Snow Thrower
MTD Products LLC - Product Training and Education Department
FORM NUMBER 769-01418
9/2004
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 ............................................................................................5
Drive Belt Replacement .............................................................................................6
Friction Wheel Removal ............................................................................................. 6
Planetary Gear Removal ............................................................................................8
Drive Shaft Removal ..................................................................................................9
Axlw Shaft Removal .................................................................................................10
Splitting the Unit .......................................................................................................11
FRiction Wheel Disc Disassembly ............................................................................13
Auger Pulley Removal ..............................................................................................14
Auger and Impeller Removal ....................................................................................14
Auger and Impeller Notes .........................................................................................15
Reducer Transmission .............................................................................................16
Reduction Transmission Disassembly .....................................................................16
Auger Idler Arm ........................................................................................................16
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
GENERAL INFORMATION
The Owner’s Manual packet includes and engine manual, extra shear pins and cotter pins as well as a packet
containing a sample of Sta-Bill fuel stabilizer that will
treat up to 2 ½ gallons of regular gas.
CAUTION: When assembling the handle for the
first time, use caution when lifting the handle.
The shift lever rod can get caught on the lower
handle cross member and if forced into position
can bend the spring shift lever. If necessary,
move the shift rod in front of the cross member
as you raise the handle into position.
There are two Supplement Sheets dated July 19 2004
and July 20, 2004 – Subject: Connector Sleeve on Two
Stage Snow Thrower shift rod. (Styles: E, F, H, K, L, N,
O, P and Q.)
Vibration may cause the rod connector sleeve to slide
up out of position. The remedy is to slide the connecter
sleeve fully down. Secure it in place by placing a rubber bushing over the top of the lower shift rod OR the
upper shift rod.. (A small piece of gas line can be used
as a bushing.) This will prevent the sleeve from sliding
up the shaft. See Figure 1.
• 21” Intake Height
• Tecumseh Engine With Electric Start
• Power Steering
• 4 – Way Discharge Chute Control
• 6 Forward Speeds and 2 Reverse Speeds
• Built in Halogen Light
• Fully assembled with oil in engine
• The 4-way discharge chute control: for quick and
easy snow directional changes.
• Power Steering: For ultimate maneuverability
• XTREME Auger: Break down of ice and snow
before pushing the pieces into the impeller.
• Built-in Halogen Light: For use in early morning
or evening.
Rubber Bushing
Rod Connector Sleeve
Figure 1
Rubber bands hold the Auger and Drive control cables
in their respective nylon pulleys during shipping and
generally break during assembly of the handle.
Remove any pieces of rubber band after assembly.
1
There is a storage area in the handle panel used for
holding the spare auger shear pins. See Figure 2.
Shear Pins Storage Area
2.3. Pull the hairpin clip out of the clevis pin on the
chute support rod. Save the hardware.
2.4. Insert the round end of the chute control box on
the short tube of the chute assembly. See Figure
4.
Figure 2
1. 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.
2. CHUTE INSTALLATION
2.1. Apply a light lubricant to the rim/lip of the chute
base (and the underside of the chute assembly)
and position the chute over the base.
2.2. Close the flange keepers to secure the chute to
the base. See Figure 3.
Flange Keepers
Chute Control
Figure 4
2.5. Insert the other end of the chute control box into
the chute support tube.
2.6. Insert the clevis pin, removed earlier, through the
holes on the chute control box and the chute
support rod. Secure with the hairpin clip. See
Figure 5.
Clevis Pin
Figure 3
NOTE: If the flange keepers will not easily click
into place, use the palm of your hand to apply
swift, firm pressure to the back of each.
Figure 5
3. SKID SHOE AND SHAVE PLATE ADJUSTMENT
The space between the shave plate and the ground
can be adjusted.
For close snow removal on a smooth surface, raise
skid shoes higher on the auger housing to lower the
2
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 operator and bystanders and/or damage to the snow
thrower and surrounding property.
For initial adjustment we recommend placing the shave
plate on a piece of cardboard.
3.1. Loosen the four hex nuts (two on each side) and
carriage bolts attaching the skid shoes to the
auger housing. See Figure 6.
Hex Nuts
4.1. Remove the carriage bolts and hex nuts, which
attach it to the snow thrower housing. See Figure 7.
Carriage Bolts
Figure 7
4.2. Install a new shave plate, making sure the heads
of the carriage bolts are to the inside of housing.
4.3. Tighten nuts securely.
Skid Shoe
Figure 6
3.2. Move the skid shoes to the ground.
3.3. Tighten the hex nuts.
NOTE: Make certain the entire bottom surface of
skid shoe is against the ground to avoid uneven
wear on the skid shoes.
4. SHAVE PLATE REPLACEMENT
The shave plate will wear over time. It can be replaced
when worn excessively.
NOTE: You willl need to remove the skid shoes
prior to removing the shave plate.
5. DRIVE CONTROL CABLE ADJUSTMENT
When the drive control is released and in the disengaged, or "up" position, the cable should have very little
slack. It should NOT be tight.
Check the adjustment of the drive control as follows:
5.1. With the drive control released, push the snow
thrower gently forward. The unit should roll
freely.
5.2. Engage the drive control and gently attempt to
push the snow thrower forward. The wheels
should not turn. The unit should not roll freely.
5.3. With the drive control released, move the shift
lever back and forth between the R2 position
and the F6 position several times. There should
be no resistance in the shift lever.
If any of the above tests failed, the drive cable is in
need of adjustment.
3
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