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Craftsman
Gas Walk-Behind Mower

Model # 917370921 Official Craftsman lawn mower

Here are the diagrams and repair parts for Official Craftsman 917370921 lawn mower, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual
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Model diagram and schematic

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ALL PARTS
Showing 10 of 318 parts  |
Lawn & Garden Equipment Nut 409148
#33

Drive control/gear case/wheels diagram

Lawn & garden equipment nut

Part #409148

Replaced by #532409149

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Manufacturer substitution
This part replaces 409148. Substitute parts can look different from the original.
BEST SELLER
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$5.31 | 
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Lawn Mower Hex Flange Nut 409149
#57

Drive control/gear case/wheels diagram

Lawn mower hex flange nut

Part #409149

Replaced by #532409149

?
Manufacturer substitution
This part replaces 409149. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
In Stock
Blade Adapter 421782
#46

Engine/housing/handle diagram

Blade adapter

Part #421782

Replaced by #581473301

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Manufacturer substitution
This part replaces 421782. Substitute parts can look different from the original.
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$19.36 | 
9% OFF Phone Price : $21.36
In Stock
Lawn Mower Wheel, 8 X 1.75-in 400249X460
#40

Drive control/gear case/wheels diagram

Lawn mower wheel, 8 x 1.75-in

Part #400249X460

Replaced by #583733801

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Manufacturer substitution
This part replaces 400249X460. Substitute parts can look different from the original.
BEST SELLER
$26.89 | 
18% OFF Phone Price : $32.89
In Stock
Return Spring 406558
#55

Drive control/gear case/wheels diagram

Return spring

Part #406558

Replaced by #532406558

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Manufacturer substitution
This part replaces 406558. Substitute parts can look different from the original.
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$9.31 | 
10% OFF Phone Price : $10.31
In Stock
Lawn Mower Grass Bag Frame Assembly 446432
#31

Engine/housing/handle diagram

Lawn mower grass bag frame assembly

Part #446432

Replaced by #585054703

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Manufacturer substitution
This part replaces 446432. Substitute parts can look different from the original.
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$32.98 | 
15% OFF Phone Price : $38.98
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Mulching Door 420019
#33

Engine/housing/handle diagram

Mulching door

Part #420019

Replaced by #532420019

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Manufacturer substitution
This part replaces 420019. Substitute parts can look different from the original.
BEST SELLER
$19.98 | 
9% OFF Phone Price : $21.98
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Handle Knob 182398
#6

Engine/housing/handle diagram

Handle knob

Part #182398

Replaced by #532182398

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Manufacturer substitution
This part replaces 182398. Substitute parts can look different from the original.
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$7.98 | 
11% OFF Phone Price : $8.98
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Lawn Mower Wheel 428780X428
#32

Drive control/gear case/wheels diagram

Lawn mower wheel

Part #428780X428

Replaced by #581336701

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Manufacturer substitution
This part replaces 428780X428. Substitute parts can look different from the original.
BEST SELLER
$49.98 | 
11% OFF Phone Price : $55.98
In Stock
Nut.flange.5 155377
#57

Engine/housing/handle diagram

Nut.flange.5

Part #155377

Replaced by #596039201

?
Manufacturer substitution
This part replaces 155377. Substitute parts can look different from the original.
This item is not returnable
$5.11
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…

Read more

Why does my lawn mower run rough?

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

Read more

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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