MTD
Gas Snowblower

Model #31AS63TF799 Official MTD 26" snow thrower

Here are the diagrams and repair parts for MTD 31AS63TF799 26" 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 341 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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MSRP: $5.22
Snowblower Auger Clutch Cable (replaces 946-04230A)#17

Auger & housing/gearbox Diagram

Snowblower auger clutch cable

Part #946-04230A
Replaced by #946-04230B
?
Manufacturer substitution
This part replaces 946-04230A. Substitute parts can look different from the original.
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MSRP: $19.00
Lawn & Garden Equipment Lock Nut, 5/16-18 (replaces 753-05591)

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

Part #712-04063
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Lawn & Garden Equipment Hex Flange Nut (replaces 753-05549, 912-0417A)#9

Drive Diagram

Lawn & garden equipment hex flange nut (replaces 753-05549, 912-0417a)

Part #712-0417A
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Lawn & Garden Equipment Carriage Bolt (replaces 753-08024, 910-0451)#4

Auger & housing/gearbox Diagram

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

Part #710-0451
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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)

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

Part #712-04065
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Snowblower Speed Selector Cable (replaces 746-04396, 746-04396A)#29

Chutes/handles Diagram

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Snowblower Skid Shoe#36

Auger & housing/gearbox Diagram

Snowblower skid shoe

Part #731-06439
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Snowblower Spring#14

Auger & housing/gearbox Diagram

Snowblower spring

Part #732-04460
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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
Main causes: snow build-up in chute, chute drive mechanism failure, bad chute control assembly

Repair guides for gas snowblowers

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

November 20, 2022
By Lyle Weischwill
How to replace a snowblower fuel filter

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

Repair difficulty
Time required
 15 minutes or less
November 18, 2022
By Lyle Weischwill
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. It's an easy adjustment that you can handle yourself.

Repair difficulty
Time required
 15 minutes or less
December 1, 2015
By Lyle Weischwill
How to rebuild a snowblower carburetor

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

Repair difficulty
Time required
 45 minutes or less

Articles and videos common to all snowblowers

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

December 6, 2022

Snowblower won’t start – 4 easy DIY fixes

By Lyle Weischwill

Find easy DIY tips to fix your snowblower when it won't start

November 21, 2022

How to make your snowblower last longer

By Lyle Weischwill

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

November 17, 2022

What are the major parts of a snowblower?

By Lyle Weischwill

Learn about major functional parts of your snowblower and when to replace them.