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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
- #24
Lawn mower diagram
Craftsman troybilt lawn mower 21-in deck mulching bladePart #942-0741A
Get free shipping with Automatic Reorder
$28.54 |17% OFF Phone Price : $34.54Back Order - #8
Lawn mower diagram
Lawn mower grass bagPart #964-04154
Replaced by #964-04154B
?Manufacturer substitutionThis part replaces 964-04154. Substitute parts can look different from the original.$40.28 |13% OFF Phone Price : $46.28In Stock - #2
Lawn mower diagram
Upper handlePart #749-04681-0637
Replaced by #749-05084B-0637
?Manufacturer substitutionThis part replaces 749-04681-0637. Substitute parts can look different from the original.$34.91 |15% OFF Phone Price : $40.91In Stock - #10
Lawn mower diagram
Mtd lawn mower side chute deflectorPart #731-07486
$23.42 |20% OFF Phone Price : $29.42In Stock - #36
Lawn mower diagram
Mtd lawn mower rear skirtPart #731-07203
$14.47 |12% OFF Phone Price : $16.47Back Order - #31
Lawn mower diagram
Lawn mower blade supportPart #736-0524B
Replaced by #736-0524B-1
?Manufacturer substitutionThis part replaces 736-0524B. Substitute parts can look different from the original.Get free shipping with Automatic Reorder
$6.78 |13% OFF Phone Price : $7.78Back Order - #32
Lawn mower diagram
Mtd lawn and garden equipment nutPart #712-04064
This item is not returnable$4.49 |18% OFF Phone Price : $5.49Back Order - #41
Lawn mower diagram
Mtd lawn mower front axle assemblyPart #911-04143B
$31.20 |16% OFF Phone Price : $37.20In Stock - #25
Lawn mower diagram
Mtd lawn & garden equipment hex bolt, 3/8-24 x 1-1/2-inPart #710-1044
This item is not returnable$5.33 |16% OFF Phone Price : $6.33In Stock - #23
Lawn mower diagram
Lawn mower blade adapterPart #748-04096
Replaced by #753-06304
?Manufacturer substitutionThis part replaces 748-04096. Substitute parts can look different from the original.This item is not returnable$30.49 |16% OFF Phone Price : $36.49Back Order
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
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
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
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.

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

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

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…