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MTD
Front-Tine Tiller

Model # 21AS144R799 Official MTD front-tine tiller

Here are the diagrams and repair parts for Official MTD 21AS144R799 front-tine tiller, 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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Showing 10 of 127 parts  |
Mount 753-04029
#21

Engine parts diagram

Mount

Part #753-04029

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

Washer 753-04052
#11

Cultivator assembly diagram

Washer

Part #753-04052

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

Clutch Drum 791-153592
#63

Engine parts diagram

Clutch drum

Part #791-153592

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

Oil Pan 791-182377
#83

Engine parts diagram

Oil pan

Part #791-182377

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

Button 791-181008
#88

Engine parts diagram

Button

Part #791-181008

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

Cyl Asm:ac 2 753-04816
#16

Engine parts diagram

Cyl asm:ac 2

Part #753-04816

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

Lower Handle 753-04053
#12

Cultivator assembly diagram

Lower handle

Part #753-04053

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

Muffler 753-04036
#44

Engine parts diagram

Muffler

Part #753-04036

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

Housing 753-04500
#34

Cultivator assembly diagram

Housing

Part #753-04500

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

Starter Assembly 753-05075
#59

Engine parts diagram

Starter assembly

Part #753-05075

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

Most common symptoms to help you fix your tillers

Choose a symptom to see related tiller repairs.

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Why do my tiller's tines turn but the wheels don't?

Main causes: clutch cable problems, faulty transmission…

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Why does my tiller turn the soil poorly?

Main causes: damaged tines, broken clevis pins, worn drive belt, faulty transmission, clutch cable problems, improper de…

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Why won't my tillers wheels or tines turn?

Main causes: worn or broken drive belts, bad transmission, clutch cable problems…

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Why does my tiller's engine leak oil or gas?

Main causes: leaky engine head gasket, damaged sump gasket, damaged oil drain plug seal, loose or cracked fuel line, lea…

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Why do my tiller's wheels turn but the tines don't?

Main causes: broken shaft clevis pins, transmission failure…

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Why does my tiller's engine run roughly or misfire?

Main causes: dirty carburetor, engine needs tune up, stale gas…

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Why won't my tiller's engine start?

Main causes: carburetor failure, bad gasoline, dirty spark plug, broken recoil starter…

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Most common repair guides to help fix your tillers

These step-by-step repair guides will help you safely fix what’s broken on your tiller.

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How to replace a tiller recoil starter

How to replace a tiller recoil starter

The recoil starter spins the engine when you pull the starter rope, and the rope retracts when released. If the recoil s…

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your tillers

Use the advice and tips in these articles and videos to get the most out of your tiller.

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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

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Find the right carburetor assembly for a Craftsman snowblower, tiller or log splitter

Find the right carburetor assembly for a Craftsman snowblower, tiller or log splitter

This chart will help you find the right carburetor for your Craftsman snowblower, tiller or log splitter.…

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