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Craftsman
Gas Walk-Behind Mower

Model # 9179998B Official Craftsman lawn mower

Here are the diagrams and repair parts for Official Craftsman 9179998B 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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Owner’s manual
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Model diagram and schematic

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Showing 10 of 169 parts  |
Lawn Mower 21-in Deck Mulching Blade 406706
#56

Lawn mower diagram

Lawn mower 21-in deck mulching blade

Part #406706

Replaced by #532406706

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Manufacturer substitution
This part replaces 406706. Substitute parts can look different from the original.
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Get free shipping with Automatic Reorder

$26.64 | 
18% OFF Phone Price : $32.64
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Lawn Mower Grass Bag 408955
#50

Lawn mower diagram

Lawn mower grass bag

Part #408955

Replaced by #532410666

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Manufacturer substitution
This part replaces 408955. Substitute parts can look different from the original.
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$68.54 | 
8% OFF Phone Price : $74.54
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Lawn Mower Blade Adapter 850977
#57

Lawn mower diagram

Lawn mower blade adapter

Part #850977

Replaced by #581547901

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Manufacturer substitution
This part replaces 850977. Substitute parts can look different from the original.
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$19.36 | 
9% OFF Phone Price : $21.36
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Bolt 401638
#36

Lawn mower diagram

Bolt

Part #401638

Replaced by #596203801

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Manufacturer substitution
This part replaces 401638. Substitute parts can look different from the original.
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This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
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Nut 132004
#5

Lawn mower diagram

Nut

Part #132004

Replaced by #582478602

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Manufacturer substitution
This part replaces 132004. Substitute parts can look different from the original.
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$2.64 | 
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Bolt 17000510
#84

Lawn mower diagram

Bolt

Part #17000510

Replaced by #817000510

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Manufacturer substitution
This part replaces 17000510. Substitute parts can look different from the original.
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$6.64 | 
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Guide.rope.s 194788
#4

Lawn mower diagram

Guide.rope.s

Part #194788

Replaced by #586122501

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Manufacturer substitution
This part replaces 194788. Substitute parts can look different from the original.
This item is not returnable
$15.59 | 
11% OFF Phone Price : $17.59
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Walk-behind Lawn Mower Selector Knob 87877
#33

Lawn mower diagram

Walk-behind lawn mower selector knob

Part #87877

Replaced by #532087877

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Manufacturer substitution
This part replaces 87877. Substitute parts can look different from the original.
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
In Stock
Screw.10-16 178848
#12

Lawn mower diagram

Screw.10-16

Part #178848

Replaced by #532178848

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Manufacturer substitution
This part replaces 178848. Substitute parts can look different from the original.
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
In Stock
American Yard Products Lawn & Garden Equipment Washer (replaces 532088343, 532088348, 5320883-48, 532-088348, 532088384) 88348
#65

Lawn mower diagram

American yard products lawn & garden equipment washer (replaces 532088343, 532088348, 5320883-48, 532-088348, 532088384)

Part #88348

Replaced by #532088348

?
Manufacturer substitution
This part replaces 88348. Substitute parts can look different from the original.
This item is not returnable
$6.83
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 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. …

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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

Top questions about Sears and Sears PartsDirect

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

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