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MTD
Rear-Tine Tiller

Model # 21D-64M8793 Official MTD rear tine gas tiller

Here are the diagrams and repair parts for Official MTD 21D-64M8793 rear tine gas tiller, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

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Showing 10 of 11 parts  |
Lawn & Garden Equipment Engine Spark Plug 951-10292
#NI07

Tiller diagram

Lawn & garden equipment engine spark plug

Part #951-10292

Replaced by #951-10292A

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Manufacturer substitution
This part replaces 951-10292. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.88 | 
15% OFF Phone Price : $6.88
Back Order
Kmart Lawn & Garden Equipment Engine Air Filter (replaces 951-14262) 951-10794
#NI01

Tiller diagram

Kmart lawn & garden equipment engine air filter (replaces 951-14262)

Part #951-10794

BEST SELLER
$12.58 | 
14% OFF Phone Price : $14.58
In Stock
Yard Machines Lawn Mower Handle Knob (replaces 01000382, 113589, 720-04072, 720-04125) 720-04072A
#NI06

Tiller diagram

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

Part #720-04072A

BEST SELLER
$9.33 | 
10% OFF Phone Price : $10.33
In Stock
Craftsman Tiller Wheel Assembly 634-06504
#NI12

Tiller diagram

Craftsman tiller wheel assembly

Part #634-06504

$131.01 | 
8% OFF Phone Price : $143.01
In Stock
Tiller Forward Drive Control Cable (replaces 946-04413) 946-04413A
#NI03

Tiller diagram

Tiller forward drive control cable (replaces 946-04413)

Part #946-04413A

$46.56 | 
11% OFF Phone Price : $52.56
In Stock
Lawn & Garden Equipment Engine Fuel Tank Cap 951-12535
#NI05

Tiller diagram

Lawn & garden equipment engine fuel tank cap

Part #951-12535

This item is not returnable
$31.09 | 
16% OFF Phone Price : $37.09
In Stock
Kmart Tiller Drive Belt (replaces 1916657) 954-04090
#NI02

Tiller diagram

Kmart tiller drive belt (replaces 1916657)

Part #954-04090

This item is not returnable

Get free shipping with Automatic Reorder

$25.18 | 
19% OFF Phone Price : $31.18
In Stock
Bolo Tine, 10-in 742-04226
Bolo tine, 10-in

Part #742-04226

Replaced by #742-04226-0637

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Manufacturer substitution
This part replaces 742-04226. Substitute parts can look different from the original.
$22.79 | 
21% OFF Phone Price : $28.79
In Stock
Bolo Tine, 10-in 742-04227
Bolo tine, 10-in

Part #742-04227

Replaced by #742-04227-0637

?
Manufacturer substitution
This part replaces 742-04227. Substitute parts can look different from the original.
$25.06 | 
19% OFF Phone Price : $31.06
In Stock
Handle Grip 720-05023
#NI04

Tiller diagram

Handle grip

Part #720-05023

Replaced by #720-05023A

?
Manufacturer substitution
This part replaces 720-05023. Substitute parts can look different from the original.
$40.09
In Stock

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…

Read more

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…

Read more

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

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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A guide to garden tillers

A guide to garden tillers

Rear tine tiller or front tine tiller, what to know to help in choosing the correct one for your needs.…

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