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Gas Walk-Behind Mower

Model # 11A-B21K799 Official MTD lawn mower

Here are the diagrams and repair parts for Official MTD 11A-B21K799 lawn mower, as well as links to manuals and error code tables, if available.

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Browse Parts for11A-B21K799 Walk-Behind Mowers

  • Craftsman Troybilt Lawn Mower 21-in Deck Mulching Blade 942-0741A
    #24

    Lawn mower diagram

    Craftsman troybilt lawn mower 21-in deck mulching blade

    Part #942-0741A

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    $28.54
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  • Lawn Mower Grass Bag 964-04154
    #8

    Lawn mower diagram

    Lawn mower grass bag

    Part #964-04154

    Replaced by #964-04154B

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    Manufacturer substitution
    This part replaces 964-04154. Substitute parts can look different from the original.
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    $40.28
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  • Upper Handle 749-04681-0637
    #2

    Lawn mower diagram

    Upper handle

    Part #749-04681-0637

    Replaced by #749-05084B-0637

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    Manufacturer substitution
    This part replaces 749-04681-0637. Substitute parts can look different from the original.
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    $34.91
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  • Mtd Lawn Mower Side Chute Deflector 731-07486
    #10

    Lawn mower diagram

    Mtd lawn mower side chute deflector

    Part #731-07486

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    $23.42
    20% OFF Phone Price : $29.42
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  • Mtd Lawn Mower Rear Skirt 731-07203
    #36

    Lawn mower diagram

    Mtd lawn mower rear skirt

    Part #731-07203

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    $14.47
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  • Lawn Mower Blade Support 736-0524B
    #31

    Lawn mower diagram

    Lawn mower blade support

    Part #736-0524B

    Replaced by #736-0524B-1

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    This part replaces 736-0524B. Substitute parts can look different from the original.
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    $6.78
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  • Mtd Lawn And Garden Equipment Nut 712-04064
    #32

    Lawn mower diagram

    Mtd lawn and garden equipment nut

    Part #712-04064

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    $4.49
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  • Mtd Lawn Mower Front Axle Assembly 911-04143B
    #41

    Lawn mower diagram

    Mtd lawn mower front axle assembly

    Part #911-04143B

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    $31.20
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  • Mtd Lawn & Garden Equipment Hex Bolt, 3/8-24 X 1-1/2-in 710-1044
    #25

    Lawn mower diagram

    Mtd lawn & garden equipment hex bolt, 3/8-24 x 1-1/2-in

    Part #710-1044

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    $5.33
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  • Lawn Mower Blade Adapter 748-04096
    #23

    Lawn mower diagram

    Lawn mower blade adapter

    Part #748-04096

    Replaced by #753-06304

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    This part replaces 748-04096. Substitute parts can look different from the original.
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    $30.49
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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.

The best time of day to mow grass (and when you should absolutely not)

The best time of day to mow grass (and when you should absolutely not)

Wondering when to mow your lawn for the best results? Timing matters more than you might think. Discover the best time o…

Top 10 electric lawn and garden tools

Top 10 electric lawn and garden tools

Learn about the top 10 must-have electric lawn & garden tools for 2023…

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.…