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MTD
Gas Walk-Behind Mower

Model # 12A-449T402 Official MTD lawn mower

Here are the diagrams and repair parts for Official MTD 12A-449T402 lawn mower, 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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ALL PARTS
Showing 10 of 130 parts  |
Blade-21" Mu 742-0741
#46

Drive/housing/handle diagram

Blade-21" mu

Part #742-0741

Replaced by #942-0741A

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Manufacturer substitution
This part replaces 742-0741. Substitute parts can look different from the original.
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$29.10 | 
17% OFF Phone Price : $35.10
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Cable Tie 726-0240
#26

Drive/housing/handle diagram

Cable tie

Part #726-0240

Replaced by #726-0178

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Manufacturer substitution
This part replaces 726-0240. Substitute parts can look different from the original.
This item is not returnable
$2.16
In Stock
Aircap Lawn & Garden Equipment Hex Screw 710-0896
#59

Drive/housing/handle diagram

Aircap lawn & garden equipment hex screw

Part #710-0896

This item is not returnable
$5.22 | 
16% OFF Phone Price : $6.22
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Yard Machines Lawn & Garden Equipment Bolt 710-1174
#20

Drive/housing/handle diagram

Yard machines lawn & garden equipment bolt

Part #710-1174

This item is not returnable
$10.97 | 
15% OFF Phone Price : $12.97
In Stock
Yard-man Lawn & Garden Equipment Hex Screw 710-1256
#15

Drive/housing/handle diagram

Yard-man lawn & garden equipment hex screw

Part #710-1256

This item is not returnable
$10.37
In Stock
Lawn Tractor Hex Nut 712-0271
#30

Drive/housing/handle diagram

Lawn tractor hex nut

Part #712-0271

This item is not returnable
$6.66 | 
13% OFF Phone Price : $7.66
In Stock
Lawn Mower Drive Pinion Gear 717-1762
#44

Idler/wheel diagram

Lawn mower drive pinion gear

Part #717-1762

This item is not returnable
$21.24 | 
22% OFF Phone Price : $27.24
In Stock
Lawn & Garden Equipment Screw 710-0606
#48

Drive/housing/handle diagram

Lawn & garden equipment screw

Part #710-0606

This item is not returnable
$8.21 | 
11% OFF Phone Price : $9.21
In Stock
Dust Cover Wheel 782-7551
#43

Idler/wheel diagram

Dust cover wheel

Part #782-7551

Replaced by #782-7551A

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Manufacturer substitution
This part replaces 782-7551. Substitute parts can look different from the original.
This item is not returnable
$6.76 | 
13% OFF Phone Price : $7.76
In Stock
Screw #12x. 7510042824
#40

Drive/housing/handle diagram

Screw #12x.

Part #7510042824

Replaced by #710-1650

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Manufacturer substitution
This part replaces 7510042824. Substitute parts can look different from the original.
This item is not returnable
$5.95 | 
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Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

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Why does my lawn mower vibrate a lot?

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

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Why does my lawn mower cut unevenly?

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

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Why does my lawn mower run rough?

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

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Why won't my lawn mower move?

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

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Why won't my lawn mower start?

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

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Why does my lawn mower stall?

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

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Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

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How to rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

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Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

Read more
Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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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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Types of walk-behind mower blades video

Types of walk-behind mower blades video

Learn about the different kinds of mower blades and how to maintain them.…

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