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MTD
Gas Snowblower

Model # 31AS3CAD799 Official MTD snow thrower

Here are the diagrams and repair parts for Official MTD 31AS3CAD799 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

Model diagram and schematic

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ALL PARTS
Showing 10 of 97 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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Yard Machines Lawn & Garden Equipment Lock Nut, 5/16-18 (replaces 753-05591) 712-04063
#20

Chute diagram

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

Part #712-04063

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

Chute diagram

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

Part #710-0451

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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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Yard Machines Lawn Tractor Flange Nut (replaces 00012173, Wd-129-103) 712-04065
#21

Chute diagram

Yard machines lawn tractor flange nut (replaces 00012173, wd-129-103)

Part #712-04065

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Snowblower Auger Drive Belt 754-04014
#48

Handle/drive housing 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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Skid Shoe 784-5580
#46

Chute diagram

Skid shoe

Part #784-5580

Replaced by #784-5580-0637

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This part replaces 784-5580. Substitute parts can look different from the original.
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Clean-out Tool 731-2643
#14

Chute diagram

Clean-out tool

Part #731-2643

Replaced by #931-2643

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Snowblower Ground Drive Belt 754-04013
#47

Handle/drive housing diagram

Snowblower ground drive belt

Part #754-04013

Replaced by #954-04013

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Manufacturer substitution
This part replaces 754-04013. Substitute parts can look different from the original.
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Knob Wing Nut 720-0284
Knob wing nut

Part #720-0284

Replaced by #720-04072A

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This part replaces 720-0284. Substitute parts can look different from the original.
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Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

View all

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 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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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 adjust snowblower engine valve lash

How to adjust snowblower engine valve lash

Adjust the engine valve lash on your snowblower to keep the engine starting and running smoothly.…

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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.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a snowblower shave plate

How to replace a snowblower shave plate

Follow the 7 easy steps in this repair guide/video to replace a worn out shave plate on your snowblower.…

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Repair difficulty
Time required
 15 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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