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MTD
Gas Walk-Behind Mower

Model # 12A-764M799 Official MTD gas walk behind lawn mower

Here are the diagrams and repair parts for Official MTD 12A-764M799 gas walk behind lawn mower, as well as links to manuals and error code tables, if available.

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Owner’s manual
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Model diagram and schematic

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ALL PARTS
Showing 10 of 279 parts  |
Lawn & Garden Equipment Hex Flange Nut (replaces 753-05549, 912-0417a) 712-0417A
#50

Deck assy./wheel/belt diagram

Lawn & garden equipment hex flange nut (replaces 753-05549, 912-0417a)

Part #712-0417A

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$8.00 | 
11% OFF Phone Price : $9.00
In Stock
Ace Lawn & Garden Equipment Self-tapping Bolt, 5/16-18 X 3/4-in (replaces 1724491, 1740496, 1909304, 910-1260a, Gw-7101260) 710-1260A
#47

Deck assy./wheel/belt diagram

Ace lawn & garden equipment self-tapping bolt, 5/16-18 x 3/4-in (replaces 1724491, 1740496, 1909304, 910-1260a, gw-7101260)

Part #710-1260A

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This item is not returnable
$4.34 | 
19% OFF Phone Price : $5.34
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Pulley, Idler, 4.25" Dia. 756-04129
Pulley, idler, 4.25" dia.

Part #756-04129

Replaced by #753-08171

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Manufacturer substitution
This part replaces 756-04129. Substitute parts can look different from the original.
BEST SELLER
$34.29 | 
15% OFF Phone Price : $40.29
In Stock
Toro Lawn & Garden Equipment Carriage Bolt (replaces 753-08024, 910-0451) 710-0451
#44

Deck assy./wheel/belt diagram

Toro lawn & garden equipment carriage bolt (replaces 753-08024, 910-0451)

Part #710-0451

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$5.42 | 
16% OFF Phone Price : $6.42
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Blade 742-04154
#58

Deck assy./wheel/belt diagram

Blade

Part #742-04154

Replaced by #942-04154A

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Manufacturer substitution
This part replaces 742-04154. Substitute parts can look different from the original.
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Get free shipping with Automatic Reorder

$19.71 | 
9% OFF Phone Price : $21.71
In Stock
Yard Machines Lawn & Garden Equipment Bell Washer (replaces 936-0242) 736-0242
Yard machines lawn & garden equipment bell washer (replaces 936-0242)

Part #736-0242

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$6.58 | 
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V-belt 754-04139
#60

Deck assy./wheel/belt diagram

V-belt

Part #754-04139

Replaced by #954-04139

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Manufacturer substitution
This part replaces 754-04139. Substitute parts can look different from the original.

Get free shipping with Automatic Reorder

$31.54 | 
16% OFF Phone Price : $37.54
In Stock
Yard Machines Lawn Tractor Bolt (replaces 01000668, 1982728, 1983620, 43001, 715326, 910-0253, 9711, B1100046, Gw-325284, Gw-750a, Gw-90012, Gw-9711, Gw-98068, Gw-98-068, Gw-b1100046, Gw-b70235, Gw-m6520008, Gw-pt/01395/00, Gw-pt/80153/00, Gw-t70235, Wd- 710-0514
#45

Deck assy./wheel/belt diagram

Yard machines lawn tractor bolt (replaces 01000668, 1982728, 1983620, 43001, 715326, 910-0253, 9711, b1100046, gw-325284, gw-750a, gw-90012, gw-9711, gw-98068, gw-98-068, gw-b1100046, gw-b70235, gw-m6520008, gw-pt/01395/00, gw-pt/80153/00, gw-t70235, wd-

Part #710-0514

This item is not returnable
$5.33 | 
16% OFF Phone Price : $6.33
In Stock
Lawn & Garden Equipment Cotter Pin (replaces 914-0145) 714-0145
Lawn & garden equipment cotter pin (replaces 914-0145)

Part #714-0145

This item is not returnable
$6.97
In Stock
Water Nozzle Adapter 721-04041
#65

Deck assy./wheel/belt diagram

Water nozzle adapter

Part #721-04041

Replaced by #921-04041

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Manufacturer substitution
This part replaces 721-04041. Substitute parts can look different from the original.
$31.07 | 
16% OFF Phone Price : $37.07
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 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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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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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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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…

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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. …

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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…

Read more
Repair difficulty
Time required
 45 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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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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