MTD
Gas Snowblower

Model #31A-250-800 MTD snow thrower

Here are the diagrams and repair parts for MTD 31A-250-800 snow thrower, as well as links to manuals and error code tables, if available.


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

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Showing 10 of 83 parts

Lawn & Garden Equipment Lock Nut, 5/16-18

#5

Fuel tank/auger Diagram

Lawn & garden equipment lock nut, 5/16-18

Part #712-04063
This item is not returnable
$3.36

In Stock

Lawn & Garden Equipment Nut

#28

Fuel tank/auger Diagram

Lawn & garden equipment nut

Part #712-04064
This item is not returnable
$3.32

In Stock

Lawn & Garden Equipment Carriage Bolt

#3

Chute/handle/shroud Diagram

Lawn & garden equipment carriage bolt

Part #710-0451
This item is not returnable
$3.59
10% OFFMSRP:$4.00

In Stock

Snowblower Auger Paddle

#42

Fuel tank/auger Diagram

Snowblower auger paddle

Part #735-04033
This item is not returnable
$4.92
15% OFFMSRP:$5.80

In Stock

Lawn Tractor Flat Washer

#24

Chute/handle/shroud Diagram

Lawn tractor flat washer

Part #736-0362
This item is not returnable
$2.99
7% OFFMSRP:$3.20

In Stock

Lawn & Garden Equipment Hex Screw

#25

Fuel tank/auger Diagram

Lawn & garden equipment hex screw

Part #710-0896
This item is not returnable
$2.83
6% OFFMSRP:$3.00

In Stock

Lawn & Garden Equipment Carriage Bolt

#2

Chute/handle/shroud Diagram

Lawn & garden equipment carriage bolt

Part #710-04071
This item is not returnable
$2.92
6% OFFMSRP:$3.10

In Stock

Lawn Mower Roller Wheel

#41

Fuel tank/auger Diagram

Lawn mower roller wheel

Part #756-0625
This item is not returnable
$5.71
5% OFFMSRP:$6.00

In Stock

Lawn & Garden Equipment Engine Fuel Line Clamp

#8

Fuel tank/auger Diagram

Lawn & garden equipment engine fuel line clamp

Part #726-0205
This item is not returnable
$2.84
5% OFFMSRP:$3.00

In Stock

Lawn & Garden Equipment Washer

#21

Chute/handle/shroud Diagram

Lawn & garden equipment washer

Part #736-0225
This item is not returnable
$2.71

In Stock

Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

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

Repair guides for gas snowblowers

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

December 1, 2015
By Lyle Weischwill
How to replace a snowblower spark plug

You need a spark to fire up the engine of your snowblower, and that spark comes from a spark plug. You can replace one in minutes.

Repair difficulty
Time required
 15 minutes or less
December 1, 2015
By Lyle Weischwill
How to replace a snowblower fuel line

Replace the fuel line on your snowblower if it's cracked or damaged.

Repair difficulty
Time required
 30 minutes or less
January 20, 2015
By Lyle Weischwill
How to replace a snowblower shear pin

The shear pin breaks if you hit hard-packed snow, to protect the engine from damage. Your snowblower auger won't rotate until you fix it. You can replace it in about 10 minutes.

Repair difficulty
Time required
 15 minutes or less

Articles and videos for gas snowblowers

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

November 1, 2014

How to adjust a snowblower auger control video

By Sears PartsDirect staff

This video shows how to adjust a snowblower's auger control.

November 1, 2014

How to adjust a snowblower drive control video

By Sears PartsDirect staff

Learn how to tighten a snowblower drive control if the drive slips or doesn't engage, and how to loosen it if the snowblower creeps when you disengage the drive.

November 1, 2014

How to adjust a snowblower chute control rod video

By Sears PartsDirect staff

See how to replace the chute control rod on a snowblower.