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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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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 201 parts  |
Lock Nut 73900600
#15

Impeller & gear box diagram

Lock nut

Part #73900600

Replaced by #532409149

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Manufacturer substitution
This part replaces 73900600. Substitute parts can look different from the original.
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$5.31 | 
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Pipe Fitting 132010
#52

Drive diagram

Pipe fitting

Part #132010

Replaced by #532409149

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Manufacturer substitution
This part replaces 132010. Substitute parts can look different from the original.
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$5.31 | 
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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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$2.64 | 
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Snowblower Auger Drive Belt 408007
#1

Impeller & traction belts diagram

Snowblower auger drive belt

Part #408007

Replaced by #532408007

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Manufacturer substitution
This part replaces 408007. Substitute parts can look different from the original.
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$37.98 | 
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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
Snowblower Chute Control Assembly 428272
#1

Lever/cable rotator diagram

Snowblower chute control assembly

Part #428272

Replaced by #532428272

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Manufacturer substitution
This part replaces 428272. Substitute parts can look different from the original.
$111.41 | 
10% OFF Phone Price : $123.41
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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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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
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 | 
13% OFF Phone Price : $15.31
In Stock

Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

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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 stop running after a few seconds?

Main causes: dirty carburetor, stale fuel…

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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…

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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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 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 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 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…

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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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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 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.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a snowblower chute control gearbox assembly

How to replace a snowblower chute control gearbox assembly

Replace the chute control gearbox on your snowblower if it's stripped or damaged.…

Read more
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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