Craftsman
Lawn & Garden Engine

Model # 143525021 Official Craftsman 4-cycle engine

Here are the diagrams and repair parts for Official Craftsman 143525021 4-cycle engine, 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 215 parts  |

Fuel Line 30706
#78

Basic engine diagram

Fuel line

Part #30706

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

Screw 28820
#88

Basic engine diagram

Screw

Part #28820

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

Governor Gear Assembly 30591
#107

Basic engine diagram

Governor gear assembly

Part #30591

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

Tube 27627
#44

Basic engine diagram

Tube

Part #27627

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

/gov Clamp 29916
#165

Basic engine diagram

/gov clamp

Part #29916

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

Gasket 27554
#25

Carburetor no. 630945 diagram

Gasket

Part #27554

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

Gasket Set 30732
#169

Basic engine diagram

Gasket set

Part #30732

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

Bushing 29530
#93

Basic engine diagram

Bushing

Part #29530

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

Gasket 27913
#75

Basic engine diagram

Gasket

Part #27913

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

Screw 650494
#74

Basic engine diagram

Screw

Part #650494

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.

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…

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

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

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…

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 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…

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. …

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…

Repair difficulty
Time required
 45 minutes or less

Effective articles & videos to help repair your lawn & garden engines

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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.…

What are the main components of a lawn mower?

What are the main components of a lawn mower?

Learn about the main parts of a lawn mower and when to replace parts.…