Craftsman
Lawn & Garden Engine

Model # 143984012 Official Craftsman engine

Here are the diagrams and repair parts for Official Craftsman 143984012 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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Showing 10 of 126 parts  |

Lawn & Garden Equipment Engine Air Filter 35066
#245

Engine 143.984012 diagram

Lawn & garden equipment engine air filter

Part #35066

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Lawn Mower O-ring 631028
#29

Carburetor 640076a diagram

Lawn mower o-ring

Part #631028

Replaced by #631028A

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Manufacturer substitution
This part replaces 631028. Substitute parts can look different from the original.
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Needle Seat 631021
#30

Carburetor 640076a diagram

Needle seat

Part #631021

Replaced by #631021B

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This part replaces 631021. Substitute parts can look different from the original.
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Repair Kit 632760
#NI

Carburetor 640076a diagram

Repair kit

Part #632760

Replaced by #632760B

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This part replaces 632760. Substitute parts can look different from the original.
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Line 34357
#290

Engine 143.984012 diagram

Line

Part #34357

Replaced by #29774

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This part replaces 34357. Substitute parts can look different from the original.
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Lawn & Garden Equipment Engine Air Filter Collar Gasket 34338
#239

Engine 143.984012 diagram

Lawn & garden equipment engine air filter collar gasket

Part #34338

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Float 632019
#28

Carburetor 640076a diagram

Float

Part #632019

Replaced by #632019A

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This part replaces 632019. Substitute parts can look different from the original.
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Lawn & Garden Equipment Engine Carburetor O-ring 632547
#37

Carburetor 640076a diagram

Lawn & garden equipment engine carburetor o-ring

Part #632547

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Lawn & Garden Equipment Engine Intake Gasket 36786
#224

Engine 143.984012 diagram

Lawn & garden equipment engine intake gasket

Part #36786

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Lawn & Garden Equipment Engine Oil Seal 27897
#75

Engine 143.984012 diagram

Lawn & garden equipment engine oil seal

Part #27897

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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.…