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MTD
Gas Walk-Behind Mower

Model # 12BBP2R3793 (2021) Official MTD m320 lawn mower

Here are the diagrams and repair parts for Official MTD 12BBP2R3793-2021 m320 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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Model diagram and schematic

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Troybilt Lawn Mower 21-in Deck Mulching Blade (replaces 01002810, 742-0741a, 942-04276, 942-0741) 942-0741A
Troybilt lawn mower 21-in deck mulching blade (replaces 01002810, 742-0741a, 942-04276, 942-0741)

Part #942-0741A

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Lawn Mower Rear Skirt 731-07203
Lawn mower rear skirt

Part #731-07203

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Yard Machines Lawn & Garden Equipment Nut 712-04064
#NI

Grassbag/handle/height adjustment knob diagram

Yard machines lawn & garden equipment nut

Part #712-04064

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Lawn & Garden Equipment Engine Fuel Tank Cap (replaces Bs-597414) BS-84004416
#NI

Quick reference diagram

Lawn & garden equipment engine fuel tank cap (replaces bs-597414)

Part #BS-84004416

Replaced by #84004416

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Manufacturer substitution
This part replaces BS-84004416. Substitute parts can look different from the original.
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Lawn Mower Lower Handle Knob (replaces 720-05066) 720-05066A
#NI

Grassbag/handle/height adjustment knob diagram

Lawn mower lower handle knob (replaces 720-05066)

Part #720-05066A

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$6.04 | 
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Lawn Mower 21-in Deck Xtreme Mulching Blade 942-0741-X
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 Drive Control Bar 731-17335
#NI

Control bails/deck assy diagram

Lawn mower drive control bar

Part #731-17335

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Lawn Tractor Screw 710-04998
#NI

Grassbag/handle/height adjustment knob diagram

Lawn tractor screw

Part #710-04998

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Lawn & Garden Equipment Screw 710-05073
#NI

Side discharge chute/transmission/wheels diagram

Lawn & garden equipment screw

Part #710-05073

This item is not returnable
$6.19 | 
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Lawn Mower Zone Control Cable (replaces 946-05107a) 946-05107B
Lawn mower zone control cable (replaces 946-05107a)

Part #946-05107B

$39.64
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 run rough?

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

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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 vibrate a lot?

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

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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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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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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 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…

Read more
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. …

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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…

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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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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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Introducing new technical repair content that we’re developing for the Sears Technical Institute

Introducing new technical repair content that we’re developing for the Sears Technical Institute

Learn about Sears Technical Institute and the advanced technical content being developed for aspiring appliance techs.…

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Top questions about Sears and Sears PartsDirect

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