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MTD
Rear-Tine Tiller

Model # 21AA413J052 Official MTD rear-tine tiller

Here are the diagrams and repair parts for Official MTD 21AA413J052 rear-tine tiller, as well as links to manuals and error code tables, if available.

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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.

Owner’s manual

Model diagram and schematic

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Showing 10 of 137 parts  |
Yard Machines Lawn & Garden Equipment Nut 712-04064
#19

Tine/wheels diagram

Yard machines lawn & garden equipment nut

Part #712-04064

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This item is not returnable
$4.49
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Bearing 741-0124
#34

Gear case diagram

Bearing

Part #741-0124

Replaced by #941-0600

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Manufacturer substitution
This part replaces 741-0124. Substitute parts can look different from the original.
BEST SELLER
$28.71
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17% OFF Phone Price : $34.71
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Tiller Wing Nut 712-0421
#33

Shield & handle diagram

Tiller wing nut

Part #712-0421

Replaced by #712-0421

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Manufacturer substitution
This part replaces 712-0421. Substitute parts can look different from the original.
This item is not returnable
$2.49
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29% OFF Phone Price : $3.49
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Ryobi Lawn Tractor Screw 710-0376
#37

Shield & handle diagram

Ryobi lawn tractor screw

Part #710-0376

This item is not returnable
$5.11
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16% OFF Phone Price : $6.11
In Stock
Sears Lawn & Garden Equipment Hex Bolt 710-3180
#10

Tine/wheels diagram

Sears lawn & garden equipment hex bolt

Part #710-3180

This item is not returnable
$6.93
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13% OFF Phone Price : $7.93
In Stock
Toro Lawn & Garden Equipment Lock Washer (replaces 936-0169) 736-0169
#38

Shield & handle diagram

Toro lawn & garden equipment lock washer (replaces 936-0169)

Part #736-0169

This item is not returnable
$5.26
In Stock
Yard Machines Lawn & Garden Equipment Screw 710-1017
Yard machines lawn & garden equipment screw

Part #710-1017

This item is not returnable
$12.71
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14% OFF Phone Price : $14.71
In Stock
Ryobi Lawn & Garden Equipment Hex Nut (replaces 912-3010) 712-3010
#8

Tine/wheels diagram

Ryobi lawn & garden equipment hex nut (replaces 912-3010)

Part #712-3010

$7.71
In Stock
Ryobi Tiller Detent Ball 741-0862
#43

Gear case diagram

Ryobi tiller detent ball

Part #741-0862

This item is not returnable
$6.86
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13% OFF Phone Price : $7.86
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Shaft Seal 721-0378
#1

Gear case diagram

Shaft seal

Part #721-0378

Replaced by #921-0378

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Manufacturer substitution
This part replaces 721-0378. Substitute parts can look different from the original.
This item is not returnable
$24.37
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20% OFF Phone Price : $30.37
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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...

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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