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MTD 21A-450 rear tine gas tiller

MTD 21A-450 rear tine gas tiller Parts

Here are the diagrams and repair parts for MTD 21A-450 rear tine gas tiller, as well as links to manuals and error code tables, if available.

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Browse Parts for 21A-450 Tillers

  • Troy-bilt Lawn & Garden Hex Lock Nut for MTD 21A-450 - Part 912-0431

    Handle/tine adapter/shield diagram

    Nut

    Part #712-0431

    Replaced by #912-0431

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    Manufacturer substitution
    This part replaces 712-0431. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $8.94
    10% OFF Phone Price : $9.94Info Icon
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  • Tiller Gear Case Cover, Left for MTD 21A-450 - Part 686-04129-0637

    Gear case assembly diagram

    Housing Assembly

    Part #786-0171

    Replaced by #686-04129-0637

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    Manufacturer substitution
    This part replaces 786-0171. Substitute parts can look different from the original.
    In Stock
    $339.36
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  • Mtd Tiller Tine for MTD 21A-450 - Part 742-0305A-0637

    Handle/tine adapter/shield diagram

    13" Articula

    Part #742-0305

    Replaced by #742-0305A-0637

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    Manufacturer substitution
    This part replaces 742-0305. Substitute parts can look different from the original.
    In Stock
    $22.51
    21% OFF Phone Price : $28.51Info Icon
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  • Shield for MTD 21A-450 - Part 786-0090A-0637

    Handle/tine adapter/shield diagram

    Shield

    Part #786-0090

    Replaced by #786-0090A-0637

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    Manufacturer substitution
    This part replaces 786-0090. Substitute parts can look different from the original.
    In Stock
    $52.18
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  • Tiller Input Shaft for MTD 21A-450 - Part 711-1349B

    Gear case assembly diagram

    Input Shaft

    Part #711-1349

    Replaced by #711-1349B

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    Manufacturer substitution
    This part replaces 711-1349. Substitute parts can look different from the original.
    In Stock
    $111.14
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  • Tiller Bearing for MTD 21A-450 - Part 741-0421B

    Gear case assembly diagram

    Tiller Bearing

    Part #741-0421

    Replaced by #741-0421B

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    Manufacturer substitution
    This part replaces 741-0421. Substitute parts can look different from the original.
    In Stock
    $30.40
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  • Tiller Idler Pulley for MTD 21A-450 - Part 917-0059B

    Gear case assembly diagram

    Tiller Idler Pulley

    Part #617-0059

    Replaced by #917-0059B

    Info Icon
    Manufacturer substitution
    This part replaces 617-0059. Substitute parts can look different from the original.
    In Stock
    $145.85
    8% OFF Phone Price : $157.85Info Icon
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  • Gear Asm-rev for MTD 21A-450 - Part 617-0058A

    Gear case assembly diagram

    Gear Assembly

    Part #617-0058

    Replaced by #617-0058A

    Info Icon
    Manufacturer substitution
    This part replaces 617-0058. Substitute parts can look different from the original.
    In Stock
    $108.31
    Minus Item
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  • Mtd Tiller Gear Case Shaft Spur Gear, 44-tooth for MTD 21A-450 - Part 717-1582B

    Gear case assembly diagram

    Spur Gear

    Part #717-1582

    Replaced by #717-1582B

    Info Icon
    Manufacturer substitution
    This part replaces 717-1582. Substitute parts can look different from the original.
    In Stock
    $92.11
    35% OFF Was : $141.39Info Icon
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  • Mtd Lawn & Garden Equipment Hex Nut for MTD 21A-450 - Part 712-3010

    Outer and inner engine pulley/wheels diagram

    Hex Nut

    Part #712-0267

    Replaced by #712-3010

    Info Icon
    Manufacturer substitution
    This part replaces 712-0267. Substitute parts can look different from the original.
    In Stock
    $55.59
    10% OFF Phone Price : $61.59Info Icon
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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 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 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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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 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 do my tiller's tines turn but the wheels don't?

Main causes: clutch cable problems, faulty transmission…

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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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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 time and Difficulty

 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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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.…

Read more
Tiller common questions

Tiller common questions

These frequently asked questions might help you figure out what's wrong with your garden tiller.…

Read more

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