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MTD
Gas Walk-Behind Mower

Model # 12AE997E099 Official MTD lawn mower

Here are the diagrams and repair parts for Official MTD 12AE997E099 lawn mower, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 281 parts  |
Blade-21" Mu 742-0741
#34

Handle/housing/grassbag 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
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17% OFF Phone Price : $35.10
In Stock
Lawn Mower Blade Support (replaces 936-0524a) 736-0524B
#32

Handle/housing/grassbag diagram

Lawn mower blade support (replaces 936-0524a)

Part #736-0524B

Replaced by #736-0524B-1

?
Manufacturer substitution
This part replaces 736-0524B. Substitute parts can look different from the original.
BEST SELLER

Get free shipping with Automatic Reorder

$6.58
| 
13% OFF Phone Price : $7.58
In Stock
Yard Machines Lawn & Garden Equipment Nut 712-04064
#66

Handle/housing/grassbag diagram

Yard machines lawn & garden equipment nut

Part #712-04064

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This item is not returnable
$4.49
| 
18% OFF Phone Price : $5.49
In Stock
Lawn & Garden Equipment Hex Head Screw 710-0895
#38

Handle/housing/grassbag diagram

Lawn & garden equipment hex head screw

Part #710-0895

$8.20
| 
11% OFF Phone Price : $9.20
In Stock
Spark Plug KM-BPR5ES
#10

Flywheel/ignition coil diagram

Spark plug

Part #KM-BPR5ES

Replaced by #4006

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Manufacturer substitution
This part replaces KM-BPR5ES. Substitute parts can look different from the original.
This item is not returnable
$5.83
In Stock
Lawn & Garden Equipment Carriage Bolt (replaces 1186069, 583108, 706-101080, 706-10602-12, 791-182213) 710-0703
#23

Handle/housing/grassbag diagram

Lawn & garden equipment carriage bolt (replaces 1186069, 583108, 706-101080, 706-10602-12, 791-182213)

Part #710-0703

This item is not returnable
$6.46
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13% OFF Phone Price : $7.46
In Stock
Lawn & Garden Equipment Push Cap (replaces 1917798, 926-0214) 726-0214
#53

Tranmission/wheels diagram

Lawn & garden equipment push cap (replaces 1917798, 926-0214)

Part #726-0214

This item is not returnable
$15.99
| 
11% OFF Phone Price : $17.99
In Stock
Wheel-comp 9 734-2010
#6

Tranmission/wheels diagram

Wheel-comp 9

Part #734-2010

Replaced by #734-2010B

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Manufacturer substitution
This part replaces 734-2010. Substitute parts can look different from the original.
$61.70
| 
9% OFF Phone Price : $67.70
In Stock
Blade Adapter 748-0377C
#31

Handle/housing/grassbag diagram

Blade adapter

Part #748-0377C

Replaced by #748-0377E

?
Manufacturer substitution
This part replaces 748-0377C. Substitute parts can look different from the original.
This item is not returnable
$26.00
| 
19% OFF Phone Price : $32.00
In Stock
Cable Adjuster Spacer 746-0711B
#7

Handle/housing/grassbag diagram

Cable adjuster spacer

Part #746-0711B

Replaced by #946-0711B

?
Manufacturer substitution
This part replaces 746-0711B. Substitute parts can look different from the original.
$32.85
| 
15% OFF Phone Price : $38.85
In Stock

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...

Read more

Why does my lawn mower cut unevenly?

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

Read more

Why does my lawn mower run rough?

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

Read more

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 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 transmission

How to replace a lawn mower transmission

Learn how to replace the transmission on your lawn mower if it's locked up or won't drive the wheels....

Read more
Repair difficulty
Time required
60 minutes or less
How to replace a lawn mower carburetor

How to replace a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Replace the carburetor if it's clogged or damaged....

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

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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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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