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MTD
Front-Tine Tiller

Model # 21AK125G799 Official MTD mini tiller

Here are the diagrams and repair parts for Official MTD 21AK125G799 mini 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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Owner’s manual

Model diagram and schematic

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Showing 10 of 70 parts  |
Lawn & Garden Equipment Engine Spark Plug 753-06193
#4

Shortblock/fuel tank diagram

Lawn & garden equipment engine spark plug

Part #753-06193

Replaced by #753-06847

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Manufacturer substitution
This part replaces 753-06193. Substitute parts can look different from the original.
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$9.76 | 
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Ace Line Trimmer Carburetor (replaces 751-15112, 751-15112a, 753-08984) 753-06288
#9

Shortblock/fuel tank diagram

Ace line trimmer carburetor (replaces 751-15112, 751-15112a, 753-08984)

Part #753-06288

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$38.78 | 
13% OFF Phone Price : $44.78
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Lawn & Garden Equipment Engine Carburetor Mount Gasket (replaces 721-04381) 753-06253
#10

Shortblock/fuel tank diagram

Lawn & garden equipment engine carburetor mount gasket (replaces 721-04381)

Part #753-06253

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This item is not returnable
$4.60 | 
18% OFF Phone Price : $5.60
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Sleeve Bolt 791-180288
#32

Shield/tines/handle diagram

Sleeve bolt

Part #791-180288

Replaced by #710-0599

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Manufacturer substitution
This part replaces 791-180288. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$4.91 | 
17% OFF Phone Price : $5.91
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Line Trimmer Carburetor Insulator Assembly 753-06189
#7

Shortblock/fuel tank diagram

Line trimmer carburetor insulator assembly

Part #753-06189

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$10.22 | 
16% OFF Phone Price : $12.22
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Yard-man Lawn & Garden Equipment Clutch Assembly (replaces 791-182369) 753-05860
#28

Shortblock/fuel tank diagram

Yard-man lawn & garden equipment clutch assembly (replaces 791-182369)

Part #753-05860

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Troybilt Lawn & Garden Equipment O-ring 753-06185
#8

Shortblock/fuel tank diagram

Troybilt lawn & garden equipment o-ring

Part #753-06185

This item is not returnable
$4.51 | 
18% OFF Phone Price : $5.51
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Push Cap 753-04062
#19

Shield/tines/handle diagram

Push cap

Part #753-04062

Replaced by #726-0299

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Manufacturer substitution
This part replaces 753-04062. Substitute parts can look different from the original.
This item is not returnable
$12.39 | 
14% OFF Phone Price : $14.39
In Stock
Ace Cultivator Air Filter 753-06836
#14

Shortblock/fuel tank diagram

Ace cultivator air filter

Part #753-06836

This item is not returnable
$5.64 | 
15% OFF Phone Price : $6.64
In Stock
Ace Tiller Throttle Control Cable 753-06831
#4

Shield/tines/handle diagram

Ace tiller throttle control cable

Part #753-06831

This item is not returnable
$18.06 | 
10% OFF Phone Price : $20.06
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…

Read more

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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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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