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Model # 21AA404B031 Official MTD rear-tine tiller
Here are the diagrams and repair parts for Official MTD 21AA404B031 rear-tine tiller, as well as links to manuals and error code tables, if available.
 Owner’s manualBy Schematic
By Part
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21AA404B031 Tillers
#8
Handle & tine shield diagram
Yard machines lawn tractor flange nut (replaces 00012173, wd-129-103)
Part #712-04065
This item is not returnable
$5.27 |Â
16% OFFÂ Phone Price : $6.27
Back Order
Lawn tractor screw (replaces 01000628, 01000865, 1186307, 1186308, 791-180288, 791-683298, 910-0599)
Part #710-0599
This item is not returnable
$4.91 |Â
17% OFFÂ Phone Price : $5.91
In Stock
#16
Drive system diagram
Lawn & garden equipment lock washer
Part #936-0119
This item is not returnable
$6.05 |Â
14% OFFÂ Phone Price : $7.05
In Stock
#15
Drive system diagram
Lawn tractor spring (replaces 732-04276)
Part #732-04276A
This item is not returnable
$13.52 |Â
13% OFFÂ Phone Price : $15.52
In Stock
#38
Handle & tine shield diagram
Tiller reverse cable
Part #946-04504
$43.02 |Â
12% OFFÂ Phone Price : $49.02
In Stock
#39
Handle & tine shield diagram
Tiller forward drive control cable
Part #946-04506
$46.27 |Â
11% OFFÂ Phone Price : $52.27
In Stock
#27
Drive system diagram
Reverse belt
Part #1916658
Replaced by #954-04091
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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 |Â
18% OFFÂ Phone Price : $33.89
In Stock
Lawn tractor hex bolt
Part #710-3008
This item is not returnable
$4.62 |Â
18% OFFÂ Phone Price : $5.62
In Stock
#12
Drive system diagram
Lawn & garden equipment flange nut
Part #712-0700
This item is not returnable
$14.17 |Â
12% OFFÂ Phone Price : $16.17
In Stock
#30
Drive system diagram
Sears lawn mower roller wheel
Part #756-0625
This item is not returnable
$12.00 |Â
14% OFFÂ Phone Price : $14.00
Back Order
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Most common symptoms to help you fix your tillers
Choose a symptom to see related tiller repairs.
Main causes: clutch cable problems, faulty transmission…
Main causes: damaged tines, broken clevis pins, worn drive belt, faulty transmission, clutch cable problems, improper de…
Main causes: worn or broken drive belts, bad transmission, clutch cable problems…
Main causes: leaky engine head gasket, damaged sump gasket, damaged oil drain plug seal, loose or cracked fuel line, lea…
Main causes: broken shaft clevis pins, transmission failure…
Main causes: dirty carburetor, engine needs tune up, stale gas…
Main causes: carburetor failure, bad gasoline, dirty spark plug, broken recoil starter…
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.
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…
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.
Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…
Get answers to frequently asked questions about Sears and Sears PartsDirect.…
This chart will help you find the right carburetor for your Craftsman snowblower, tiller or log splitter.…