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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

BEST SELLER
$8.00 | 
11% OFF Phone Price : $9.00
In Stock
Yard Machines Lawn & Garden Equipment Nut 712-04064
#13

Deck assy./wheel/belt diagram

Yard machines lawn & garden equipment nut

Part #712-04064

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This item is not returnable
$4.49 | 
18% OFF Phone Price : $5.49
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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This item is not returnable
$5.42 | 
16% OFF Phone Price : $6.42
In Stock
Yard Machines Lawn Tractor Flange Nut (replaces 00012173, Wd-129-103) 712-04065
Yard machines lawn tractor flange nut (replaces 00012173, wd-129-103)

Part #712-04065

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This item is not returnable
$5.27 | 
16% OFF Phone Price : $6.27
In Stock
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
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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
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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
Oil Drain 751-3140
#54

Frame/handles diagram

Oil drain

Part #751-3140

Replaced by #951-10517A

?
Manufacturer substitution
This part replaces 751-3140. Substitute parts can look different from the original.
This item is not returnable
$27.89 | 
18% OFF Phone Price : $33.89
In Stock
Water Nozzle Adapter 721-04041
#65

Deck assy./wheel/belt diagram

Water nozzle adapter

Part #721-04041

Replaced by #921-04041

?
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 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.…

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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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