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MTD
Gas Snowblower

Model # 31A-3ABD799 Official MTD snow thrower

Here are the diagrams and repair parts for Official MTD 31A-3ABD799 snow thrower, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

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

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 111 parts  |
Lawn & Garden Equipment Cotter Pin, 1/4- To 5/16-in 714-04040
Lawn & garden equipment cotter pin, 1/4- to 5/16-in

Part #714-04040

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$3.00
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Troybilt Snowblower Shear Pin (replaces 738-04124) 738-04124A
#42

Auger & housing/chute diagram

Troybilt snowblower shear pin (replaces 738-04124)

Part #738-04124A

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Yard Machines Lawn & Garden Equipment Lock Nut, 5/16-18 (replaces 753-05591) 712-04063
#20

Auger & housing/chute diagram

Yard machines lawn & garden equipment lock nut, 5/16-18 (replaces 753-05591)

Part #712-04063

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Yard Machines Lawn & Garden Equipment Nut 712-04064
Yard machines lawn & garden equipment nut

Part #712-04064

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$4.49
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Toro Lawn & Garden Equipment Carriage Bolt (replaces 753-08024, 910-0451) 710-0451
#3

Auger & housing/chute diagram

Toro lawn & garden equipment carriage bolt (replaces 753-08024, 910-0451)

Part #710-0451

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Snowblower Wheel Assembly, 10 X 4-in (replaces 634-0232c, 634-04282b, 934-04282a) 934-04282B
#33

Handle/engine/wheel diagram

Snowblower wheel assembly, 10 x 4-in (replaces 634-0232c, 634-04282b, 934-04282a)

Part #934-04282B

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Snowblower Clean-out Tool (replaces 731-2643) 931-2643
#14

Auger & housing/chute diagram

Snowblower clean-out tool (replaces 731-2643)

Part #931-2643

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Lawn Tractor Self-tapping Screw, 5/16-18 X 3/4-in (replaces 01008620) 710-04484
Lawn tractor self-tapping screw, 5/16-18 x 3/4-in (replaces 01008620)

Part #710-04484

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Snowblower Wing Knob 920-0284
Snowblower wing knob

Part #920-0284

Replaced by #720-04072A

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Manufacturer substitution
This part replaces 920-0284. Substitute parts can look different from the original.
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Snowblower Flange Bearing 741-0493A
#43

Auger & housing/chute diagram

Snowblower flange bearing

Part #741-0493A

Replaced by #741-0493C

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Manufacturer substitution
This part replaces 741-0493A. Substitute parts can look different from the original.
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Why won't my snowblower throw snow far enough?

Main causes: clogged chute, damaged auger blades, broken shear pins, worn auger belt, damaged gear case, engine problems...

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Why does my snowblower stop running after a few seconds?

Main causes: dirty carburetor, stale fuel...

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What should I do about a damaged snowblower tire?

Main causes: punctured tire, damaged rim...

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Why does my snowblower engine run rough?

Main causes: dirty carburetor, clogged fuel filter, dirty spark plug, incorrect valve lash, leaky engine gaskets...

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Why won't my snowblower start?

Main causes: stale gas, clogged carburetor, clogged or broken fuel line, dirty spark plug, bad rewind starter, incorrect...

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Why doesn't my snowblower self propel?

Main causes: loose drive clutch cable, damaged drive clutch cable, worn friction disc, scraper blade scraping the ground...

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Why won't my snowblower chute turn?

Main causes: snow build-up in chute, chute drive mechanism failure, bad chute control assembly...

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Why won't my snowblower clear snow well?

Main causes: clogged chute, snow build-up in auger housing, broken auger shear pins, auger drive belt needs adjustment, ...

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