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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Browse Parts for
91788777 Snowblowers
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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$2.87
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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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$41.78
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Snowblower Gearbox (replaces 174659, 532427148) 427148
#2

Impeller & gear box diagram

Snowblower gearbox (replaces 174659, 532427148)

Part #427148

Replaced by #598831601

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Manufacturer substitution
This part replaces 427148. Substitute parts can look different from the original.
$200.45
6% OFF Phone Price : $212.45
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Auger Worm Gear 407763
#24

Impeller & gear box diagram

Auger worm gear

Part #407763

Replaced by #598831601

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Manufacturer substitution
This part replaces 407763. Substitute parts can look different from the original.
$200.45
6% OFF Phone Price : $212.45
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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
$17.31
10% OFF Phone Price : $19.31
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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.
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Snowblower Nut 427942
#11

Impeller & gear box diagram

Snowblower nut

Part #427942

Replaced by #594944401

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Manufacturer substitution
This part replaces 427942. Substitute parts can look different from the original.
This item is not returnable
In Stock
Plate Skid 174762X431
#1

Skid plates diagram

Plate skid

Part #174762X431

Replaced by #532174762

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Manufacturer substitution
This part replaces 174762X431. Substitute parts can look different from the original.
In Stock
Tower Lawn & Garden Equipment Head Bolt (replaces 17060616, 17490616, 25x6, 53217000616, 817000616, 8170006-16, 817490616) 17000616
#4

Lower handle/pivot support weldment diagram

Tower lawn & garden equipment head bolt (replaces 17060616, 17490616, 25x6, 53217000616, 817000616, 8170006-16, 817490616)

Part #17000616

Replaced by #817000616

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Manufacturer substitution
This part replaces 17000616. Substitute parts can look different from the original.
In Stock
Snowblower Deflector Control Assembly 420673
#3

Chute & deflector weldments diagram

Snowblower deflector control assembly

Part #420673

Replaced by #587030801

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Manufacturer substitution
This part replaces 420673. Substitute parts can look different from the original.
$73.00
8% OFF Phone Price : $79.00
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Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

Main causes: broken shear pins, worn or loose auger drive belt, auger drive cable failure, damaged auger, bad gear case…

Main causes: clogged chute, snow build-up in auger housing, broken auger shear pins, auger drive belt needs adjustment, …

Main causes: stale gas, clogged carburetor, clogged or broken fuel line, dirty spark plug, bad rewind starter, incorrect…

Main causes: punctured tire, damaged rim…

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 b…

Main causes: dirty carburetor, clogged fuel filter, dirty spark plug, incorrect valve lash, leaky engine gaskets…

Main causes: dirty carburetor, stale fuel…

Main causes: loose drive clutch cable, damaged drive clutch cable, worn friction disc, scraper blade scraping the ground…

Repair guides for gas snowblowers

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

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.…

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.…

Repair difficulty
Time required
 15 minutes or less
How to rebuild a snowblower carburetor

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

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.

Snowblower won’t start – 4 easy DIY fixes

Snowblower won’t start – 4 easy DIY fixes

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

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.…

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.…