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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
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
Gripco Nut 1685H
#3

Housing assembly diagram

Gripco nut

Part #1685H

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

Washer 120394
#9

Leaf mulcher (optional equipment) diagram

Washer

Part #120394

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

Washer 120392
#45

Housing assembly diagram

Washer

Part #120392

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

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
Cotter 137185
#8

Hanger assembly diagram

Cotter

Part #137185

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

Washer 446363
#4

Housing assembly diagram

Washer

Part #446363

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

Bolt 126216
Bolt

Part #126216

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

Washer 120638
Washer

Part #120638

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 run rough?

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

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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 vibrate a lot?

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

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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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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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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 spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

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

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

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Repair difficulty
Time required
 45 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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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

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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