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MTD
Gas Walk-Behind Mower

Model # 12ABW3MJ793 Official MTD gas lawn mower

Here are the diagrams and repair parts for Official MTD 12ABW3MJ793 gas 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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Model diagram and schematic

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Showing 10 of 15 parts  |
Air Element BS-795066
#NI01

Lawn mower diagram

Air element

Part #BS-795066

Replaced by #795066

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Manufacturer substitution
This part replaces BS-795066. Substitute parts can look different from the original.
BEST SELLER
$16.87 | 
11% OFF Phone Price : $18.87
In Stock
Lawn Mower 28-in Deck Mulching Blade 942-05130
#NI04

Lawn mower diagram

Lawn mower 28-in deck mulching blade

Part #942-05130

Replaced by #742-05130-0637

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Manufacturer substitution
This part replaces 942-05130. Substitute parts can look different from the original.
BEST SELLER

Get free shipping with Automatic Reorder

$19.87 | 
9% OFF Phone Price : $21.87
In Stock
Lawn Mower Blade Engagement Cable 946-05250
#NI06

Lawn mower diagram

Lawn mower blade engagement cable

Part #946-05250

$71.05 | 
8% OFF Phone Price : $77.05
In Stock
Lawn Mower Ground Drive Belt, 3/8 X 24 5/8-in 954-05090
#NI03

Lawn mower diagram

Lawn mower ground drive belt, 3/8 x 24 5/8-in

Part #954-05090

This item is not returnable

Get free shipping with Automatic Reorder

$37.49 | 
14% OFF Phone Price : $43.49
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Lawn Tractor Deflector Shield 731-10510A
#NI08

Lawn mower diagram

Lawn tractor deflector shield

Part #731-10510A

$45.16 | 
12% OFF Phone Price : $51.16
In Stock
Lawn Mower Wheel, 8 X 2-in 634-05220
#NI13

Lawn mower diagram

Lawn mower wheel, 8 x 2-in

Part #634-05220

This item is not returnable
$39.92 | 
13% OFF Phone Price : $45.92
In Stock
Mulch Plug 687-05133B
#NI10

Lawn mower diagram

Mulch plug

Part #687-05133B

Replaced by #687-05133C

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Manufacturer substitution
This part replaces 687-05133B. Substitute parts can look different from the original.
$44.79 | 
12% OFF Phone Price : $50.79
In Stock
Craftsman Trail Shield 731-12261
#NI12

Lawn mower diagram

Craftsman trail shield

Part #731-12261

This item is not returnable
$23.33
In Stock
Lawn Mower Mandrel And Pulley Assembly 918-07146
#NI05

Lawn mower diagram

Lawn mower mandrel and pulley assembly

Part #918-07146

$148.88 | 
7% OFF Phone Price : $160.88
In Stock
Mtd Lawn Mower Drive Control Cable 946-05397
#NI07

Lawn mower diagram

Mtd lawn mower drive control cable

Part #946-05397

$71.43 | 
8% OFF Phone Price : $77.43
In Stock

Symptoms for gas walk-behind mowers

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

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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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Why does my lawn mower run rough?

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

Read more

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 does my lawn mower vibrate a lot?

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

Read more

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 cut unevenly?

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

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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…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower drive cable

How to replace a lawn mower drive cable

The drive cable engages the transmission to spin the drive wheels and move the mower across the grass. Replace the drive…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower starter rope

How to replace a lawn mower starter rope

These step-by-step instructions show how to replace a broken starter pull rope on a walk-behind lawn mower.…

Read more
Repair difficulty
Time required
 30 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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Tapping into a new feature in the Search Bar on Sears PartsDirect

Learn about a new feature added to the Search Bar on Sears PartsDirect…

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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

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