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Yard Machines
Front-Tine Tiller

Model # 21A-24MK020 Official Yard Machines tiller

Here are the diagrams and repair parts for Official Yard Machines 21A-24MK020 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.

Owner’s manual

Model diagram and schematic

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Showing 10 of 73 parts  |
Yard Machines Lawn & Garden Equipment Lock Nut, 5/16-18 (replaces 753-05591) 712-04063
#39

Tiller diagram

Yard machines lawn & garden equipment lock nut, 5/16-18 (replaces 753-05591)

Part #712-04063

BEST SELLER
This item is not returnable
$4.40
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19% OFF Phone Price : $5.40
In Stock
Yard Machines Lawn & Garden Equipment Nut 712-04064
#30

Tiller diagram

Yard machines lawn & garden equipment nut

Part #712-04064

BEST SELLER
This item is not returnable
$4.49
| 
18% OFF Phone Price : $5.49
In Stock
Lawn Tractor Screw (replaces 01000628, 01000865, 1186307, 1186308, 791-180288, 791-683298, 910-0599) 710-0599
#43

Tiller diagram

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

Part #710-0599

BEST SELLER
This item is not returnable
$4.91
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17% OFF Phone Price : $5.91
In Stock
Yard Machines Lawn Mower Handle Knob (replaces 01000382, 113589, 720-04072, 720-04125) 720-04072A
#2

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
Yard Machines Lawn & Garden Equipment Bell Washer (replaces 936-0242) 736-0242
#65

Tiller diagram

Yard machines lawn & garden equipment bell washer (replaces 936-0242)

Part #736-0242

This item is not returnable
$6.58
| 
13% OFF Phone Price : $7.58
In Stock
Lawn Tractor Gauge Wheel 734-0973
#51

Tiller diagram

Lawn tractor gauge wheel

Part #734-0973

$19.06
In Stock
Yard Machines Lawn Tractor Screw 710-1007
#38

Tiller diagram

Yard machines lawn tractor screw

Part #710-1007

This item is not returnable
$9.03
In Stock
Yard Machines Lawn Tractor Hex Bolt 710-0521
#25

Tiller diagram

Yard machines lawn tractor hex bolt

Part #710-0521

This item is not returnable
$8.97
In Stock
Ace Lawn Tractor Hex Screw 710-0654A
#10

Tiller diagram

Ace lawn tractor hex screw

Part #710-0654A

This item is not returnable
$6.57
| 
13% OFF Phone Price : $7.57
In Stock
Inner Tine Assembly 642-0002
#33

Tiller diagram

Inner tine assembly

Part #642-0002

Replaced by #642-0002-0637

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Manufacturer substitution
This part replaces 642-0002. Substitute parts can look different from the original.
$90.30
| 
6% OFF Phone Price : $96.30
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...

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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

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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