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MTD
Gas Walk-Behind Mower

Model # 12A-A15W793 Official MTD gas lawn mower

Here are the diagrams and repair parts for Official MTD 12A-A15W793 gas lawn mower, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

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 131 parts  |
Craftsman Troybilt Lawn Mower 21-in Deck Mulching Blade (replaces 01002810, 742-0741a, 942-04276, 942-0741) 942-0741A
#NI03

Lawn mower diagram

Craftsman troybilt lawn mower 21-in deck mulching blade (replaces 01002810, 742-0741a, 942-04276, 942-0741)

Part #942-0741A

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$27.71 | 
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Lawn Mower Drive Control Cable 946-04728
#NI08

Lawn mower diagram

Lawn mower drive control cable

Part #946-04728

Replaced by #946-04728A

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Manufacturer substitution
This part replaces 946-04728. Substitute parts can look different from the original.
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$29.67 | 
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Lawn Mower Rear Skirt 731-07203
#NI13

Lawn mower diagram

Lawn mower rear skirt

Part #731-07203

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Lawn Mower Zone Control Cable (replaces 946-1113) 946-1113A
#NI07

Lawn mower diagram

Lawn mower zone control cable (replaces 946-1113)

Part #946-1113A

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Lawn Mower Grass Bag 664P05321
#NI11

Lawn mower diagram

Lawn mower grass bag

Part #664P05321

Replaced by #664P05321A

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Manufacturer substitution
This part replaces 664P05321. Substitute parts can look different from the original.
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$39.70 | 
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Lawn Mower 21-in Deck Xtreme Mulching Blade 942-0741-X
#NI04

Lawn mower diagram

Lawn mower 21-in deck xtreme mulching blade

Part #942-0741-X

Replaced by #742P0741-X

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Manufacturer substitution
This part replaces 942-0741-X. Substitute parts can look different from the original.
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$22.68 | 
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Lawn Mower Fuel Tank Cap BS-596250
#NI09

Lawn mower diagram

Lawn mower fuel tank cap

Part #BS-596250

Replaced by #596250

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Manufacturer substitution
This part replaces BS-596250. Substitute parts can look different from the original.
This item is not returnable
$29.69 | 
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Lawn Mower Grass Bag Frame (replaces 647-04271, 747-05226) 647-04271-0637
#NI10

Lawn mower diagram

Lawn mower grass bag frame (replaces 647-04271, 747-05226)

Part #647-04271-0637

$44.56 | 
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Lawn Mower Wheel, 8 X 2-in 634-04659
#NI15

Lawn mower diagram

Lawn mower wheel, 8 x 2-in

Part #634-04659

$38.24 | 
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Lawn Mower Ground Drive Belt, 3/8 X 33-7/8-in (replaces 954-04259) 954-04259A
#NI02

Lawn mower diagram

Lawn mower ground drive belt, 3/8 x 33-7/8-in (replaces 954-04259)

Part #954-04259A

This item is not returnable

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$25.09 | 
19% OFF Phone Price : $31.09
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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 vibrate a lot?

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

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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 run rough?

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

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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 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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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 rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

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

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

Read more
Repair difficulty
Time required
 15 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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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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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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