MTD
Gas Walk-Behind Mower

Model # 12A-764M099 Official MTD gas walk behind lawn mower

Here are the diagrams and repair parts for Official MTD 12A-764M099 gas walk behind lawn mower, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 212 parts  |

Lawn & Garden Equipment Hex Flange Nut (replaces 753-05549, 912-0417a) 712-0417A
#50

Deck/wheels diagram

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

Part #712-0417A

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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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Yard Machines Lawn & Garden Equipment Nut 712-04064
#13

Deck/wheels diagram

Yard machines lawn & garden equipment nut

Part #712-04064

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Lawn Mower Idler Pulley 756-04129B
Lawn mower idler pulley

Part #756-04129B

Replaced by #753-08171

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Manufacturer substitution
This part replaces 756-04129B. Substitute parts can look different from the original.
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Brake Pad Plate TC-790007
#37

Transaxle diagram

Brake pad plate

Part #TC-790007

Replaced by #790007

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Manufacturer substitution
This part replaces TC-790007. Substitute parts can look different from the original.
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Lawn Tractor Screw (replaces 01000628, 01000865, 1186307, 1186308, 791-180288, 791-683298, 910-0599) 710-0599
#4

Handles/frame diagram

Lawn tractor screw (replaces 01000628, 01000865, 1186307, 1186308, 791-180288, 791-683298, 910-0599)

Part #710-0599

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Lawn Tractor Self-tapping Screw, 5/16-18 X 3/4-in (replaces 01008620) 710-04484
#47

Deck/wheels diagram

Lawn tractor self-tapping screw, 5/16-18 x 3/4-in (replaces 01008620)

Part #710-04484

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Yard Machines Lawn Mower Handle Knob (replaces 01000382, 113589, 720-04072, 720-04125) 720-04072A
#9

Handles/frame diagram

Yard machines lawn mower handle knob (replaces 01000382, 113589, 720-04072, 720-04125)

Part #720-04072A

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Spacer 738-04162A
#57

Deck/wheels diagram

Spacer

Part #738-04162A

Replaced by #738-04162C

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Manufacturer substitution
This part replaces 738-04162A. Substitute parts can look different from the original.
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Holder Brake TC-790025
#44

Transaxle diagram

Holder brake

Part #TC-790025

Replaced by #790025

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Manufacturer substitution
This part replaces TC-790025. Substitute parts can look different from the original.
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Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

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

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

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

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

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

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

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.

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…

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. …

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…

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.

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…

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

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