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Troybilt
Rear-Tine Tiller

Model # 21A-644H063 Official Troybilt tiller

Here are the diagrams and repair parts for Official Troybilt 21A-644H063 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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ALL PARTS
Showing 10 of 125 parts  |
Belt 1916657
#7

Belt cover/guard/engine bracket diagram

Belt

Part #1916657

Replaced by #954-04090

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Manufacturer substitution
This part replaces 1916657. Substitute parts can look different from the original.
This item is not returnable

Get free shipping with Automatic Reorder

$25.18 | 
19% OFF Phone Price : $31.18
In Stock
Drive Belt 1916658
#8

Belt cover/guard/engine bracket diagram

Drive belt

Part #1916658

Replaced by #954-04091

?
Manufacturer substitution
This part replaces 1916658. Substitute parts can look different from the original.
This item is not returnable

Get free shipping with Automatic Reorder

$27.89 | 
18% OFF Phone Price : $33.89
In Stock
Ace Lawn Tractor Hex Bolt 710-3096
#4

Single tines/wheels/tires diagram

Ace lawn tractor hex bolt

Part #710-3096

This item is not returnable
$9.93 | 
9% OFF Phone Price : $10.93
In Stock
Ryobi Lawn Tractor Screw 710-0376
#21

Belt cover/guard/engine bracket diagram

Ryobi lawn tractor screw

Part #710-0376

This item is not returnable
$5.11 | 
16% OFF Phone Price : $6.11
In Stock
Yard Machines Lawn & Garden Equipment Hex Bolt 710-0520
#23

Belt cover/guard/engine bracket diagram

Yard machines lawn & garden equipment hex bolt

Part #710-0520

This item is not returnable
$7.77
In Stock
Lawn & Garden Equipment Hex Bolt 710-0597
#2

Transmission assembly diagram

Lawn & garden equipment hex bolt

Part #710-0597

This item is not returnable
$5.80
In Stock
Ryobi Lawn & Garden Equipment Flat Washer 736-3090
#30

Belt cover/guard/engine bracket diagram

Ryobi lawn & garden equipment flat washer

Part #736-3090

This item is not returnable
$11.43
In Stock
Gear-worm Ti 1904279
#11

Shim/tiller shaft diagram

Gear-worm ti

Part #1904279

Replaced by #917-04383

?
Manufacturer substitution
This part replaces 1904279. Substitute parts can look different from the original.
$133.19 | 
8% OFF Phone Price : $145.19
In Stock
Lawn Tractor Hex Bolt 710-0805
#20

Handle/cable assembly diagram

Lawn tractor hex bolt

Part #710-0805

Replaced by #710-0805A

?
Manufacturer substitution
This part replaces 710-0805. Substitute parts can look different from the original.
This item is not returnable
$7.43
In Stock
Roll Pin 1185469
#1

Transmission assembly diagram

Roll pin

Part #1185469

Replaced by #715-04034

?
Manufacturer substitution
This part replaces 1185469. Substitute parts can look different from the original.
This item is not returnable
$11.89
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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