MTD
Gas Snowblower

Model #31A-3BAD729 Official MTD snow thrower

Here are the diagrams and repair parts for MTD 31A-3BAD729 snow thrower, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual

Showing 10 of 98 parts

Lawn & Garden Equipment Cotter Pin, 1/4- to 5/16-in

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Lawn & garden equipment cotter pin, 1/4- to 5/16-in

Part #714-04040
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Snowblower Shear Pin (replaces 738-04124)#42

Auger & housing Diagram

Snowblower shear pin (replaces 738-04124)

Part #738-04124A
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Lawn & Garden Equipment Nut

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Lawn & garden equipment nut

Part #712-04064
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Lawn Tractor Flange Nut (replaces 00012173, WD-129-103)#21

Auger & housing Diagram

Lawn tractor flange nut (replaces 00012173, wd-129-103)

Part #712-04065
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Snowblower Wheel Assembly, 10 x 4-in (replaces 634-0232C, 634-04282B, 934-04282A)#34

Fuel tank/wheels/handle Diagram

Rim

Part #634-0232A
Replaced by #934-04282B
?
Manufacturer substitution
This part replaces 634-0232A. Substitute parts can look different from the original.
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Snowblower Auger Drive Belt, 3/8 x 27-1/8-in (replaces 754-04014, 764-04014, OEM-754-04014)#49

Fuel tank/wheels/handle Diagram

Snowblower auger drive belt

Part #754-04014
Replaced by #954-04014
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Manufacturer substitution
This part replaces 754-04014. Substitute parts can look different from the original.
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MSRP: $25.00
Snowblower Skid Shoe (replaces 784-5580, 784-5580-0498)#46

Auger & housing Diagram

Skid shoe

Part #784-5580
Replaced by #784-5580-0637
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Manufacturer substitution
This part replaces 784-5580. Substitute parts can look different from the original.
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Snowblower Flange Bearing (replaces 741-0245)

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Bearing

Part #741-0245
Replaced by #941-0245
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This part replaces 741-0245. Substitute parts can look different from the original.
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Snowblower Flange Bearing (replaces 741-0493A)#43

Auger & housing Diagram

Snowblower flange bearing

Part #741-0493A
Replaced by #741-0493C
?
Manufacturer substitution
This part replaces 741-0493A. Substitute parts can look different from the original.
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Lawn Tractor Screw, 1/4-20 x 5/8-in (replaces 910-1652)#17

Fuel tank/wheels/handle Diagram

Lawn tractor screw, 1/4-20 x 5/8-in (replaces 910-1652)

Part #710-1652
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Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

Main causes: clogged chute, damaged auger blades, broken shear pins, worn auger belt, damaged gear case, engine problems
Things to do: replace the spark plug, change the oil, rebuild the carburetor, adjust valve lash, adjust or replace the belts
Main causes: punctured tire, damaged rim
Main causes: dirty carburetor, clogged fuel filter, dirty spark plug, incorrect valve lash, leaky engine gaskets
Main causes: stale gas, clogged carburetor, clogged or broken fuel line, dirty spark plug, bad rewind starter, incorrect valve lash
Main causes: clogged chute, snow build-up in auger housing, broken auger shear pins, auger drive belt needs adjustment, auger cable problems
Main causes: loose drive clutch cable, damaged drive clutch cable, worn friction disc, scraper blade scraping the ground, engine problems