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MTD
Gas Walk-Behind Mower

Model # 12A-46M9031 Official MTD lawn mower

Here are the diagrams and repair parts for Official MTD 12A-46M9031 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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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 73 parts  |
Lawn Mower Blade 942-0741
#41

Lawn mower diagram

Lawn mower blade

Part #942-0741

Replaced by #942-0741A

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Manufacturer substitution
This part replaces 942-0741. Substitute parts can look different from the original.
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$27.71 | 
15% OFF Phone Price : $32.71
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Knob 720-04072
#14

Lawn mower diagram

Knob

Part #720-04072

Replaced by #720-04072A

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Manufacturer substitution
This part replaces 720-04072. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.77 | 
48% OFF MSRP : $11.00
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Lawn Mower Blade Support (replaces 936-0524a) 736-0524B
#42

Lawn mower diagram

Lawn mower blade support (replaces 936-0524a)

Part #736-0524B

Replaced by #736-0524B-1

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Manufacturer substitution
This part replaces 736-0524B. Substitute parts can look different from the original.
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$6.11 | 
23% OFF MSRP : $7.90
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Hinge Pin 747-0710
#11

Lawn mower diagram

Hinge pin

Part #747-0710

Replaced by #747-0710A

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Manufacturer substitution
This part replaces 747-0710. Substitute parts can look different from the original.
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$3.22 | 
44% OFF MSRP : $5.70
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Torsion Spring 732-1014
#5

Lawn mower diagram

Torsion spring

Part #732-1014

Replaced by #732-1014C

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Manufacturer substitution
This part replaces 732-1014. Substitute parts can look different from the original.
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$8.08 | 
27% OFF MSRP : $11.00
In Stock
Wheel Asm-8 634-0190
#49

Lawn mower diagram

Wheel asm-8

Part #634-0190

Replaced by #634-0190A

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Manufacturer substitution
This part replaces 634-0190. Substitute parts can look different from the original.
BEST SELLER
$34.29 | 
20% OFF MSRP : $43.00
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Lawn & Garden Equipment Carriage Bolt (replaces 1186069, 583108, 706-101080, 706-10602-12, 791-182213) 710-0703
#53

Lawn mower diagram

Lawn & garden equipment carriage bolt (replaces 1186069, 583108, 706-101080, 706-10602-12, 791-182213)

Part #710-0703

This item is not returnable
$6.46 | 
13% OFF Phone Price : $7.46
In Stock
Lawn & Garden Equipment Guide Bolt 710-1205
#15

Lawn mower diagram

Lawn & garden equipment guide bolt

Part #710-1205

This item is not returnable
$5.01 | 
17% OFF Phone Price : $6.01
In Stock
Lawn & Garden Equipment Wing Nut (replaces 01002925, 920-0279) 720-0279
#13

Lawn mower diagram

Lawn & garden equipment wing nut (replaces 01002925, 920-0279)

Part #720-0279

This item is not returnable
$6.87 | 
13% OFF Phone Price : $7.87
In Stock
Lawn Mower Ground Drive Belt, 3/8 X 31-1/4-in 954-0637A
#37

Lawn mower diagram

Lawn mower ground drive belt, 3/8 x 31-1/4-in

Part #954-0637A

This item is not returnable

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$17.69 | 
10% OFF Phone Price : $19.69
In Stock

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 stall?

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

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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…

Read more

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 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 vibrate a lot?

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

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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 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.…

Read more
Repair difficulty
Time required
 60 minutes or less
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 ignition coil on a flathead engine

How to replace a lawn mower ignition coil on a flathead engine

If the spark plug doesn't fire when you try to start the mower, you could have a defective ignition coil. Follow these s…

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

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

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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