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MTD
Gas Walk-Behind Mower

Model # 12A-377B062 Official MTD gas lawn mower

Here are the diagrams and repair parts for Official MTD 12A-377B062 gas lawn mower, as well as links to manuals and error code tables, if available.

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 212 parts  |
Blade-21" Mu 742-0741
Blade-21" mu

Part #742-0741

Replaced by #942-0741A

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Manufacturer substitution
This part replaces 742-0741. Substitute parts can look different from the original.
BEST SELLER

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$27.71 | 
15% OFF Phone Price : $32.71
In Stock
Bell Support 736-0524A
Bell support

Part #736-0524A

Replaced by #736-0524B-1

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Manufacturer substitution
This part replaces 736-0524A. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable

Get free shipping with Automatic Reorder

$6.11 | 
23% OFF MSRP : $7.90
In Stock
Ball Bearing 741-0600
#7

Complete transmission/housing diagram

Ball bearing

Part #741-0600

Replaced by #941-0600

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Manufacturer substitution
This part replaces 741-0600. Substitute parts can look different from the original.
BEST SELLER
$25.63 | 
16% OFF Phone Price : $30.63
In Stock
Lawn & Garden Equipment Guide Bolt 710-1205
Lawn & garden equipment guide bolt

Part #710-1205

This item is not returnable
$5.01 | 
17% OFF Phone Price : $6.01
In Stock
Drive Cable 746-0711A
#128

Deck/bag/wheels(models 380 thru 389) diagram

Drive cable

Part #746-0711A

Replaced by #946-0711B

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Manufacturer substitution
This part replaces 746-0711A. Substitute parts can look different from the original.
$32.85 | 
13% OFF Phone Price : $37.85
In Stock
Lawn & Garden Equipment Wing Nut (replaces 01002925, 920-0279) 720-0279
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 & Garden Equipment Hex Cap Screw 710-0751
Lawn & garden equipment hex cap screw

Part #710-0751

This item is not returnable
$5.12 | 
16% OFF Phone Price : $6.12
In Stock
Lawn Mower Roller Wheel 756-0625
#40

Deck/bag/wheels(models 380 thru 389) diagram

Lawn mower roller wheel

Part #756-0625

This item is not returnable
$12.00 | 
14% OFF Phone Price : $14.00
In Stock
Lawn & Garden Equipment Flat Washer 736-3084
#4

Complete transmission/housing diagram

Lawn & garden equipment flat washer

Part #736-3084

This item is not returnable
$6.14 | 
14% OFF Phone Price : $7.14
In Stock
Lawn & Garden Equipment Hex Screw 710-0896
Lawn & garden equipment hex screw

Part #710-0896

This item is not returnable
$5.44 | 
16% OFF Phone Price : $6.44
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…

Read more

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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