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Craftsman 917378421 gas walk-behind lawn mower

Craftsman 917378421 gas walk-behind lawn mower Parts

Here are the diagrams and repair parts for Craftsman 917378421 gas walk-behind lawn mower, as well as links to manuals and error code tables, if available.

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Browse Parts for 917378421 Walk-Behind Mowers

  • Handle Adjuster Spring for Craftsman 917378421 - Part 178574

    Rotary lawn mower diagram

    Handle Adjuster Spring

    Part #178574

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

  • Adjuster.han for Craftsman 917378421 - Part 170953

    Rotary lawn mower diagram

    Adjuster.han

    Part #170953

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

  • Frame for Craftsman 917378421 - Part 175058

    Wheels and tires diagram

    Frame

    Part #175058

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

  • Lawn Mower Deck Housing Kit for Craftsman 917378421 - Part 176289

    Rotary lawn mower diagram

    Lawn Mower Deck Housing Kit

    Part #176289

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

  • E-ring for Craftsman 917378421 - Part 12000003

    Gearcase assembly 175258 diagram

    E-ring

    Part #12000003

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

  • Bracket Spring for Craftsman 917378421 - Part 81585X004

    Gearcase assembly 175258 diagram

    Bracket Spring

    Part #81585X004

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

  • Lawn Mower Shoulder Bolt for Craftsman 917378421 - Part 160828

    Rotary lawn mower diagram

    Lawn Mower Shoulder Bolt

    Part #160828

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

  • Fuel Stabilizer for Craftsman 917378421 - Part 33500

    #NI

    All parts diagram

    Fuel Stabilizer

    Part #33500

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

  • Lawn Mower Transmission Lever Return Spring for Craftsman 917378421 - Part 75192

    Wheels and tires diagram

    Lawn Mower Transmission Lever Return Spring

    Part #75192

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

  • Adjuster Knob for Craftsman 917378421 - Part 161961

    Rotary lawn mower diagram

    Adjuster Knob

    Part #161961

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

Most common symptoms to help you fix your walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

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

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

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

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

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

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.

How to replace a lawn mower front deck tray

How to replace a lawn mower front deck tray

Learn how to replace the front deck tray on your lawn mower if it's cracked or damaged.…

Repair time and Difficulty

 60 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.…

Repair time and Difficulty

 60 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…

Repair time and Difficulty

 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.

The best time of day to mow grass (and when you should absolutely not)

The best time of day to mow grass (and when you should absolutely not)

Wondering when to mow your lawn for the best results? Timing matters more than you might think. Discover the best time o…

Top 10 electric lawn and garden tools

Top 10 electric lawn and garden tools

Learn about the top 10 must-have electric lawn & garden tools for 2023…

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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