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MTD
Gas Snowblower

Model # 31AM5CSF799 Official MTD snow thrower

Here are the diagrams and repair parts for Official MTD 31AM5CSF799 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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Owner’s manual

Model diagram and schematic

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Showing 10 of 215 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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Snowblower Auger Clutch Cable (replaces 946-04230a) 946-04230B
#17

Auger & housing/gearbox diagram

Snowblower auger clutch cable (replaces 946-04230a)

Part #946-04230B

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Troybilt Snowblower Shear Pin (replaces 738-04124) 738-04124A
#21

Auger & housing/gearbox diagram

Troybilt snowblower shear pin (replaces 738-04124)

Part #738-04124A

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Snowblower Auger Drive Belt, 1/2 X 35-1/4-in 954-04050A
#34

Upper handle/handle panel diagram

Snowblower auger drive belt, 1/2 x 35-1/4-in

Part #954-04050A

Replaced by #256963

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Manufacturer substitution
This part replaces 954-04050A. Substitute parts can look different from the original.
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$32.00 | 
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Yard Machines Lawn Tractor Flange Nut (replaces 00012173, Wd-129-103) 712-04065
Yard machines lawn tractor flange nut (replaces 00012173, wd-129-103)

Part #712-04065

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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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Snowblower Steering Control Trigger 731-06113
#20

Upper handle/handle panel diagram

Snowblower steering control trigger

Part #731-06113

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Snowblower Speed Selector Cable (replaces 746-04396, 746-04396a) 946-04396A
#29

Upper handle/handle panel diagram

Snowblower speed selector cable (replaces 746-04396, 746-04396a)

Part #946-04396A

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Snowblower Scraper Blade 790-00121-4044
#35

Auger & housing/gearbox diagram

Snowblower scraper blade

Part #790-00121-4044

Replaced by #790-00121-0637

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This part replaces 790-00121-4044. Substitute parts can look different from the original.
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Snowblower Auger Shaft Gear (replaces 717-04861, 917-0528a) 917-04861
#46

Auger & housing/gearbox diagram

Snowblower auger shaft gear (replaces 717-04861, 917-0528a)

Part #917-04861

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Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

View all

Why doesn't my snowblower auger turn?

Main causes: broken shear pins, worn or loose auger drive belt, auger drive cable failure, damaged auger, bad gear case…

Read more

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, …

Read more

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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What should I do about a damaged snowblower tire?

Main causes: punctured tire, damaged rim…

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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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How do I tune up my snowblower?

Things to do: replace the spark plug, change the oil, rebuild the carburetor, adjust valve lash, adjust or replace the b…

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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 does my snowblower stop running after a few seconds?

Main causes: dirty carburetor, stale fuel…

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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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Repair guides for gas snowblowers

These step-by-step repair guides will help you safely fix what’s broken on your snowblower.

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How to replace a snowblower fuel filter

How to replace a snowblower fuel filter

Replace the fuel filter on your snowblower if it's clogged or damaged.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to adjust snowblower skid shoes

How to adjust snowblower skid shoes

To prevent snowblower auger and shave plate damage, adjust the skid shoes regularly to keep the shave plate ¼-inch high.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to rebuild a snowblower carburetor

How to rebuild a snowblower carburetor

Rebuild the carburetor on your snowblower if the engine isn't getting fuel.…

Read more
Repair difficulty
Time required
 45 minutes or less

Effective articles & videos to help repair your snowblowers

Use the advice and tips in these articles and videos to get the most out of your snowblower.

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How to make your snowblower last longer

How to make your snowblower last longer

Learn the steps to take to adjust and maintain your snowblower so it lasts longer.…

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Introducing new technical repair content that we’re developing for the Sears Technical Institute

Introducing new technical repair content that we’re developing for the Sears Technical Institute

Learn about Sears Technical Institute and the advanced technical content being developed for aspiring appliance techs.…

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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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