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Model # 12A-559K401 Official MTD gas lawn mower
Here are the diagrams and repair parts for Official MTD 12A-559K401 gas lawn mower, as well as links to manuals and error code tables, if available.
Owner’s manualBy Schematic
By Part
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12A-559K401 Walk-Behind Mowers
Blade-21" mu
Part #742-0741
Replaced by #942-0741A
?
Manufacturer substitution
This part replaces 742-0741. Substitute parts can look different from the original.
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$28.54 |
17% OFF Phone Price : $34.54
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V- belt
Part #754-0465
Replaced by #954-04032B
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Manufacturer substitution
This part replaces 754-0465. Substitute parts can look different from the original.
Get free shipping with Automatic Reorder
$29.53 |
17% OFF Phone Price : $35.53
In Stock
#58
Deck/bag/handle/wheels diagram
Mtd lawn tractor screw
Part #710-0599
This item is not returnable
$4.91 |
17% OFF Phone Price : $5.91
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#8
Wheels/tires/pulley diagram
Bearing
Part #741-0124
Replaced by #941-0600
?
Manufacturer substitution
This part replaces 741-0124. Substitute parts can look different from the original.
$32.24 |
16% OFF Phone Price : $38.24
In Stock
Yard machines lawn & garden equipment wing nut (replaces 01002925, 920-0279)
Part #720-0279
This item is not returnable
$6.87 |
13% OFF Phone Price : $7.87
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#49
Lawn mower diagram
Complete wheel
Part #734-2042
Replaced by #734-2042A
?
Manufacturer substitution
This part replaces 734-2042. Substitute parts can look different from the original.
$34.16 |
15% OFF Phone Price : $40.16
In Stock
#17
Wheels/tires/pulley diagram
Mtd lawn & garden equipment plastic plug
Part #721-0325
This item is not returnable
$6.75 |
13% OFF Phone Price : $7.75
In Stock
#34
Lawn mower diagram
Nut
Part #712-0431
Replaced by #912-0431
?
Manufacturer substitution
This part replaces 712-0431. Substitute parts can look different from the original.
This item is not returnable
$7.57 |
12% OFF Phone Price : $8.57
In Stock
Yard machines lawn & garden equipment screw
Part #710-1017
This item is not returnable
$12.71 |
14% OFF Phone Price : $14.71
In Stock
Lawn & garden equipment hex bolt (replaces 01000943, 910-1257)
Part #710-1257
This item is not returnable
$9.85 |
9% OFF Phone Price : $10.85
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Symptoms for gas walk-behind mowers
Choose a symptom to see related walk-behind mower repairs.
Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…
Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…
Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…
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: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…
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 drive cable
The drive cable engages the transmission to spin the drive wheels and move the mower across the grass. Replace the drive…
Repair difficulty
Time required
60 minutes or less
How to replace a lawn mower starter rope
These step-by-step instructions show how to replace a broken starter pull rope on a walk-behind lawn mower.…
Repair difficulty
Time required
30 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.…