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Craftsman
Gas Walk-Behind Mower

Model # 917251021 Official Craftsman 42" rotary lawn mower

Here are the diagrams and repair parts for Official Craftsman 917251021 42" rotary lawn mower, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 123 parts  |
Ret Spring 4939M
#39

Hanger assembly diagram

Ret spring

Part #4939M

Replaced by #532003146

?
Manufacturer substitution
This part replaces 4939M. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$4.02 | 
20% OFF Phone Price : $5.02
In Stock
Bolt 126216
Bolt

Part #126216

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

Gripco Nut 1685H
#3

Housing assembly diagram

Gripco nut

Part #1685H

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

Spring 2876H
#27

Hanger assembly diagram

Spring

Part #2876H

Replaced by #532002876

?
Manufacturer substitution
This part replaces 2876H. Substitute parts can look different from the original.
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
In Stock
1641-zerk 6855M
#12

Housing assembly diagram

1641-zerk

Part #6855M

Replaced by #532183226

?
Manufacturer substitution
This part replaces 6855M. Substitute parts can look different from the original.
This item is not returnable
$6.64 | 
13% OFF Phone Price : $7.64
In Stock
Washer 9914M
#42

Housing assembly diagram

Washer

Part #9914M

Replaced by #583781401

?
Manufacturer substitution
This part replaces 9914M. Substitute parts can look different from the original.
$20.54
In Stock
Cotter 137185
#8

Hanger assembly diagram

Cotter

Part #137185

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

Washer 120392
#45

Housing assembly diagram

Washer

Part #120392

Replaced by #STD551025

?
Manufacturer substitution
This part replaces 120392. Substitute parts can look different from the original.
This item is not returnable
$2.49 | 
29% OFF Phone Price : $3.49
In Stock
Clevis Pin 7461H
#21

Hanger assembly diagram

Clevis pin

Part #7461H

Replaced by #583778201

?
Manufacturer substitution
This part replaces 7461H. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock
Housing End 634A232
#30

Housing assembly diagram

Housing end

Part #634A232

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 stall?

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

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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 cut unevenly?

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

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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 does my lawn mower run rough?

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

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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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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 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.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower transmission

How to replace a lawn mower transmission

Learn how to replace the transmission on your lawn mower if it's locked up or won't drive the wheels.…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower carburetor

How to replace a lawn mower carburetor

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

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

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Types of walk-behind mower blades video

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

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