MTD
Gas Walk-Behind Mower

Model # 11A-A2SD791 Official MTD gas lawn mower

Here are the diagrams and repair parts for Official MTD 11A-A2SD791 gas 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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Model diagram and schematic

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Showing 10 of 16 parts  |

Lawn Mower 21-in Deck Mulching Blade (replaces 01002810, 742-0741a, 942-04276, 942-0741) 942-0741A
#NI02

Lawn mower diagram

Lawn mower 21-in deck mulching blade (replaces 01002810, 742-0741a, 942-04276, 942-0741)

Part #942-0741A

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$28.54
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Lawn Mower Grass Bag Frame (replaces 647-04271, 747-05226) 647-04271-0637
#NI09

Lawn mower diagram

Lawn mower grass bag frame (replaces 647-04271, 747-05226)

Part #647-04271-0637

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$45.82
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Lawn Mower Rear Skirt 731-07203
#NI13

Lawn mower diagram

Lawn mower rear skirt

Part #731-07203

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Lawn Mower Deflector Shield 731-07131
#NI07

Lawn mower diagram

Lawn mower deflector shield

Part #731-07131

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Lawn  Mower 21-in Deck Xtreme Mulching Blade 942-0741-X
#NI03

Lawn mower diagram

Lawn mower 21-in deck xtreme mulching blade

Part #942-0741-X

Replaced by #742P0741-X

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Manufacturer substitution
This part replaces 942-0741-X. Substitute parts can look different from the original.
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$22.02
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Lawn Mower Blade Adapter (replaces 748-0376c) 748-0376E
#NI04

Lawn mower diagram

Lawn mower blade adapter (replaces 748-0376c)

Part #748-0376E

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Lawn Mower Grass Bag 664P05321
#NI10

Lawn mower diagram

Lawn mower grass bag

Part #664P05321

Replaced by #664P05321A

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Manufacturer substitution
This part replaces 664P05321. Substitute parts can look different from the original.
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Lawn & Garden Equipment Engine Spark Plug 951-14437
#NI12

Lawn mower diagram

Lawn & garden equipment engine spark plug

Part #951-14437

Replaced by #951-14437A

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Manufacturer substitution
This part replaces 951-14437. Substitute parts can look different from the original.
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This item is not returnable
$5.42
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Lawn Mower Wheel 634-04642
#NI15

Lawn mower diagram

Lawn mower wheel

Part #634-04642

$35.14
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Lawn & Garden Equipment Engine Air Filter 951-14628
#NI01

Lawn mower diagram

Lawn & garden equipment engine air filter

Part #951-14628

Replaced by #951-14628A

?
Manufacturer substitution
This part replaces 951-14628. Substitute parts can look different from the original.
In Stock

Symptoms for gas walk-behind mowers

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

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

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

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

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

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

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

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.

How to replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower blade

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

Repair difficulty
Time required
 45 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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