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Craftsman
Gas Walk-Behind Mower

Model # 917378171 Official Craftsman lawn mower

Here are the diagrams and repair parts for Official Craftsman 917378171 lawn mower, 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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Model diagram and schematic

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ALL PARTS
Showing 10 of 83 parts  |
Lawn & Garden Equipment Bearing 77881
#7

Gear case assembly diagram

Lawn & garden equipment bearing

Part #77881

Replaced by #532077881

?
Manufacturer substitution
This part replaces 77881. Substitute parts can look different from the original.
$33.31
In Stock
Walk-behind Lawn Mower Engine Pulley 85543
#63

Main frame diagram

Walk-behind lawn mower engine pulley

Part #85543

Replaced by #582940301

?
Manufacturer substitution
This part replaces 85543. Substitute parts can look different from the original.
$22.26
In Stock
Lawn Mower Bushing 86960
#25

Drive assembly diagram

Lawn mower bushing

Part #86960

Replaced by #532086960

?
Manufacturer substitution
This part replaces 86960. Substitute parts can look different from the original.
This item is not returnable
$8.54
In Stock
Lawn & Garden Equipment Washer (replaces 532851074, 5328510-74) 851074
#55

Main frame diagram

Lawn & garden equipment washer (replaces 532851074, 5328510-74)

Part #851074

Replaced by #532851074

?
Manufacturer substitution
This part replaces 851074. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock
Gas Can 2.5 33623

#NI

All parts diagram

Gas can 2.5

Part #33623

The manufacturer no longer makes this part, and there's no substitute part

Screw 87866
#30

Drive assembly diagram

Screw

Part #87866

The manufacturer no longer makes this part, and there's no substitute part

Drive Head Kit 48029
#3

Drive assembly diagram

Drive head kit

Part #48029

The manufacturer no longer makes this part, and there's no substitute part

High Pro Key 87677
#64

Main frame diagram

High pro key

Part #87677

The manufacturer no longer makes this part, and there's no substitute part

Upper Handle 133088X479
#1

Main frame diagram

Upper handle

Part #133088X479

The manufacturer no longer makes this part, and there's no substitute part

Shifter 131483
#3

Gear case assembly diagram

Shifter

Part #131483

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

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Why does my lawn mower vibrate a lot?

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

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Why does my lawn mower cut unevenly?

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

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Why does my lawn mower run rough?

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

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Why won't my lawn mower move?

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

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Why won't my lawn mower start?

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

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Why does my lawn mower stall?

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

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Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

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How to rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

Read more
Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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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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Types of walk-behind mower blades video

Types of walk-behind mower blades video

Learn about the different kinds of mower blades and how to maintain them.…

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