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Craftsman
Gas Walk-Behind Mower

Model # 917378121 Official Craftsman 22" lawn mower

Here are the diagrams and repair parts for Official Craftsman 917378121 22" 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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Showing 10 of 118 parts  |
Repair Link Kit STD316659
#38

Drive assembly diagram

Repair link kit

Part #STD316659

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

Wheel And Tire Assembly 78890
#25

Main frame diagram

Wheel and tire assembly

Part #78890

Replaced by #33781

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Manufacturer substitution
This part replaces 78890. Substitute parts can look different from the original.
$13.19 | 
13% OFF Phone Price : $15.19
In Stock
Shoulder Bolt 84921
#38

Main frame diagram

Shoulder bolt

Part #84921

Replaced by #532174719

?
Manufacturer substitution
This part replaces 84921. Substitute parts can look different from the original.
This item is not returnable
$13.69
In Stock
Handle Knob 63688
#3

Main frame diagram

Handle knob

Part #63688

Replaced by #532183724

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Manufacturer substitution
This part replaces 63688. Substitute parts can look different from the original.
This item is not returnable
$11.98 | 
14% OFF Phone Price : $13.98
In Stock
Selctr Sprng 84888
#34

Main frame diagram

Selctr sprng

Part #84888

Replaced by #532401621

?
Manufacturer substitution
This part replaces 84888. Substitute parts can look different from the original.
$8.54
In Stock
Nut 53490
#7

Main frame diagram

Nut

Part #53490

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

Washer 74232
#34

Drive assembly diagram

Washer

Part #74232

Replaced by #819171912

?
Manufacturer substitution
This part replaces 74232. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock
Washer 86114
#36

Main frame diagram

Washer

Part #86114

Replaced by #532062335

?
Manufacturer substitution
This part replaces 86114. Substitute parts can look different from the original.
$13.69
In Stock
Clip 85827
#10

Drive assembly diagram

Clip

Part #85827

Replaced by #582940401

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Manufacturer substitution
This part replaces 85827. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock
Blade 69334
#54

Main frame diagram

Blade

Part #69334

Replaced by #532406713

?
Manufacturer substitution
This part replaces 69334. Substitute parts can look different from the original.

Get free shipping with Automatic Reorder

$28.29 | 
17% OFF Phone Price : $34.29
In Stock

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.…

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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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