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Craftsman
Gas Walk-Behind Mower

Model # 9179998A Official Craftsman lawn mower

Here are the diagrams and repair parts for Official Craftsman 9179998A 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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ALL PARTS
Showing 10 of 169 parts  |
Lawn & Garden Equipment Nut 409148
#61

Lawn mower 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.
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Lawn Mower Hex Flange Nut 409149
#39

Lawn mower diagram

Lawn mower hex flange nut

Part #409149

Replaced by #532409149

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Manufacturer substitution
This part replaces 409149. Substitute parts can look different from the original.
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This item is not returnable
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Hndl.knob.bl 189713X428
#14

Lawn mower diagram

Hndl.knob.bl

Part #189713X428

Replaced by #532185577

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Manufacturer substitution
This part replaces 189713X428. Substitute parts can look different from the original.
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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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$26.64 | 
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Handle Bolt 191574
#6

Lawn mower diagram

Handle bolt

Part #191574

Replaced by #532191574

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Manufacturer substitution
This part replaces 191574. Substitute parts can look different from the original.
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Lawn Mower Rear Skirt 418655
#21

Lawn mower diagram

Lawn mower rear skirt

Part #418655

Replaced by #532416860

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Manufacturer substitution
This part replaces 418655. Substitute parts can look different from the original.
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$15.98 | 
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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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$66.54 | 
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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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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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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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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…

Read more
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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