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MTD
Gas Walk-Behind Mower

Model # 550 Official MTD lawn mower

Here are the diagrams and repair parts for Official MTD 550 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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Showing 10 of 65 parts  |
Troybilt Lawn Mower 21-in Deck Mulching Blade (replaces 01002810, 742-0741a, 942-04276, 942-0741) 942-0741A
#24

Mower diagram

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

Part #942-0741A

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$29.10 | 
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Yard Machines Lawn Mower Handle Knob (replaces 01000382, 113589, 720-04072, 720-04125) 720-04072A
#9

Mower diagram

Yard machines lawn mower handle knob (replaces 01000382, 113589, 720-04072, 720-04125)

Part #720-04072A

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Lawn Tractor Screw, 1/4-20 X 5/8-in (replaces 910-1652) 710-1652
#42

Mower diagram

Lawn tractor screw, 1/4-20 x 5/8-in (replaces 910-1652)

Part #710-1652

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This item is not returnable
$5.44 | 
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Wheel Asm-8 634-0190
#32

Mower diagram

Wheel asm-8

Part #634-0190

Replaced by #634-0190A

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Manufacturer substitution
This part replaces 634-0190. Substitute parts can look different from the original.
BEST SELLER
$34.92 | 
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Lawn & Garden Equipment Wing Nut 912-0397
#38

Mower diagram

Lawn & garden equipment wing nut

Part #912-0397

Replaced by #712-0397A

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Manufacturer substitution
This part replaces 912-0397. Substitute parts can look different from the original.
This item is not returnable
$5.22 | 
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In Stock
Lawn Mower Tie Cable 926-0240
#11

Mower diagram

Lawn mower tie cable

Part #926-0240

Replaced by #726-0178

?
Manufacturer substitution
This part replaces 926-0240. Substitute parts can look different from the original.
This item is not returnable
$2.16
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Lawn Mower Screw 710-04531
#14

Mower diagram

Lawn mower screw

Part #710-04531

This item is not returnable
$7.77 | 
11% OFF Phone Price : $8.77
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Troybilt Lawn Mower Bail Control Bar (replaces 747-1161a) 747-1161A-0637
#1

Mower diagram

Troybilt lawn mower bail control bar (replaces 747-1161a)

Part #747-1161A-0637

This item is not returnable
$20.10 | 
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Troybilt Lawn Mower Grass Bag (replaces 664-04027, 964-04007, 964-04011, 964-04034b, 964-04054, 964-04065, 964-04068, 964-04122) 964-04007A
#8

Mower diagram

Troybilt lawn mower grass bag (replaces 664-04027, 964-04007, 964-04011, 964-04034b, 964-04054, 964-04065, 964-04068, 964-04122)

Part #964-04007A

$143.25 | 
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Troybilt Lawn Mower Ground Drive Belt, 3/8 X 31-1/4-in 954-0637A
#51

Mower diagram

Troybilt lawn mower ground drive belt, 3/8 x 31-1/4-in

Part #954-0637A

This item is not returnable

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$17.69 | 
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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…

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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. …

Read more
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…

Read more
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

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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