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Craftsman
Gas Snowblower

Model # 91788777 Official Craftsman snow thrower

Here are the diagrams and repair parts for Official Craftsman 91788777 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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ALL PARTS
Showing 10 of 201 parts  |
Lawn Tractor Hex Bolt, 5/16-18 X 3/4-in (replaces 17000512) 428867
Lawn tractor hex bolt, 5/16-18 x 3/4-in (replaces 17000512)

Part #428867

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Lawn & Garden Equipment Lock Nut 73800400
Lawn & garden equipment lock nut

Part #73800400

Replaced by #582478602

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Manufacturer substitution
This part replaces 73800400. Substitute parts can look different from the original.
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This item is not returnable
$2.64 | 
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Nut.flange.5 155377
Nut.flange.5

Part #155377

Replaced by #596039201

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Manufacturer substitution
This part replaces 155377. Substitute parts can look different from the original.
This item is not returnable
$5.11
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Discharge Base 175322
#5

Impeller & gear box diagram

Discharge base

Part #175322

Replaced by #585056901

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Manufacturer substitution
This part replaces 175322. Substitute parts can look different from the original.
This item is not returnable
$13.31 | 
13% OFF Phone Price : $15.31
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Lock Washer 10040500
#21

Impeller & traction belts diagram

Lock washer

Part #10040500

Replaced by #596238801

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Manufacturer substitution
This part replaces 10040500. Substitute parts can look different from the original.
This item is not returnable
$5.11
In Stock
Traction Spring 180926
#7

Impeller & traction rods diagram

Traction spring

Part #180926

Replaced by #532180926

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Manufacturer substitution
This part replaces 180926. Substitute parts can look different from the original.
This item is not returnable
$10.26
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Bar.scraper. 404932X431
#2

Auger housing diagram

Bar.scraper.

Part #404932X431

Replaced by #532404932

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Manufacturer substitution
This part replaces 404932X431. Substitute parts can look different from the original.
This item is not returnable
$13.31 | 
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In Stock
Snowblower Extension Spring 178828
#44

Drive diagram

Snowblower extension spring

Part #178828

Replaced by #532178828

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Manufacturer substitution
This part replaces 178828. Substitute parts can look different from the original.
This item is not returnable
$6.64 | 
13% OFF Phone Price : $7.64
In Stock
Bottom Pan 410877
#40

Drive diagram

Bottom pan

Part #410877

Replaced by #532410877

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Manufacturer substitution
This part replaces 410877. Substitute parts can look different from the original.
$26.64
In Stock
Snowblower Shear Bolt (replaces 198636, 532192090) 192090
Snowblower shear bolt (replaces 198636, 532192090)

Part #192090

Replaced by #588077502

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Manufacturer substitution
This part replaces 192090. Substitute parts can look different from the original.
This item is not returnable
$6.64 | 
13% OFF Phone Price : $7.64
In Stock

Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

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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 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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