MTD
Farming

Model # 21AS122R799 Official MTD 2-cycle gas cultivator

Here are the diagrams and repair parts for Official MTD 21AS122R799 2-cycle gas cultivator, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 90 parts  |

Yard Machines Muffler 791-182174
#42

Engine parts diagram

Yard machines muffler

Part #791-182174

In Stock
Yard-man Grip 791-181575
#16

Cultivator/boom parts diagram

Yard-man grip

Part #791-181575

In Stock
Lawn & Garden Equipment Washer 791-182678
#5

Cultivator/boom parts diagram

Lawn & garden equipment washer

Part #791-182678

Replaced by #4150

?
Manufacturer substitution
This part replaces 791-182678. Substitute parts can look different from the original.
This item is not returnable
In Stock
3 Prong Knob 791-182898
#7

Cultivator/boom parts diagram

3 prong knob

Part #791-182898

Replaced by #791-182677

?
Manufacturer substitution
This part replaces 791-182898. Substitute parts can look different from the original.
This item is not returnable
In Stock
Piston 753-1209

#NI02

All parts diagram

Piston

Part #753-1209

The manufacturer no longer makes this part, and there's no substitute part

Carburetor 753-04331
#6

Engine parts diagram

Carburetor

Part #753-04331

The manufacturer no longer makes this part, and there's no substitute part

Throttle Assembly 791-182881
#1

Cultivator/boom parts diagram

Throttle assembly

Part #791-182881

The manufacturer no longer makes this part, and there's no substitute part

Lawn & Garden Equipment Engine Spark Arrestor 791-182747
#44

Engine parts diagram

Lawn & garden equipment engine spark arrestor

Part #791-182747

The manufacturer no longer makes this part, and there's no substitute part

Roller 753-04798
#24

Cultivator/boom parts diagram

Roller

Part #753-04798

The manufacturer no longer makes this part, and there's no substitute part

Mount Pad 791-612134
#14

Engine parts diagram

Mount pad

Part #791-612134

The manufacturer no longer makes this part, and there's no substitute part

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

Articles and videos for gas walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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.…

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.…

Lawn mower won't start troubleshooting video: spark plug and ignition problems video

Lawn mower won't start troubleshooting video: spark plug and ignition problems video

Find out how to test and fix problems with the spark plug, stop wire, ignition coil and flywheel.…