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MTD
Gas Walk-Behind Mower

Model # 500 THRU 509 Official MTD gas lawn mower

Here are the diagrams and repair parts for Official MTD 500-THRU-509 gas lawn mower, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 67 parts  |
Bell Support 736-0524A
#23

Hi-wheel rotary mower diagram

Bell support

Part #736-0524A

Replaced by #736-0524B-1

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Manufacturer substitution
This part replaces 736-0524A. Substitute parts can look different from the original.
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$6.58 | 
13% OFF Phone Price : $7.58
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Lawn Mower Mulching Blade 742-0742
#6A

Hi-wheel rotary mower diagram

Lawn mower mulching blade

Part #742-0742

Replaced by #942-0742A

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Manufacturer substitution
This part replaces 742-0742. Substitute parts can look different from the original.

Get free shipping with Automatic Reorder

$23.20 | 
21% OFF Phone Price : $29.20
In Stock
Yard Machines Lawn & Garden Equipment Wing Nut (replaces 01002925, 920-0279) 720-0279
#29

Hi-wheel rotary mower diagram

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
In Stock
Yard Machines Lawn & Garden Equipment Guide Bolt 710-1205
#37

Hi-wheel rotary mower diagram

Yard machines lawn & garden equipment guide bolt

Part #710-1205

This item is not returnable
$5.01 | 
17% OFF Phone Price : $6.01
In Stock
Hex Nut 712-0267
#62

Hi-wheel rotary mower diagram

Hex nut

Part #712-0267

Replaced by #712-3010

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Manufacturer substitution
This part replaces 712-0267. Substitute parts can look different from the original.
$7.71
In Stock
Sears Lawn & Garden Equipment Bell Washer 736-0331
#53

Hi-wheel rotary mower diagram

Sears lawn & garden equipment bell washer

Part #736-0331

This item is not returnable
$4.91 | 
17% OFF Phone Price : $5.91
In Stock
Lawn Mower Lever 732-0404
#40

Hi-wheel rotary mower diagram

Lawn mower lever

Part #732-0404

Replaced by #94832

?
Manufacturer substitution
This part replaces 732-0404. Substitute parts can look different from the original.
This item is not returnable
$17.05 | 
10% OFF Phone Price : $19.05
In Stock
Yard Machines Lawn & Garden Equipment Bolt 710-1174
#36

Hi-wheel rotary mower diagram

Yard machines lawn & garden equipment bolt

Part #710-1174

This item is not returnable
$10.97 | 
15% OFF Phone Price : $12.97
In Stock
Yard Machines Lawn & Garden Equipment Washer (replaces 936-0105) 736-0105
#20

Hi-wheel rotary mower diagram

Yard machines lawn & garden equipment washer (replaces 936-0105)

Part #736-0105

This item is not returnable
$6.29
In Stock
Wave Washer 736-0504
#30

Hi-wheel rotary mower diagram

Wave washer

Part #736-0504

Replaced by #936-0504

?
Manufacturer substitution
This part replaces 736-0504. Substitute parts can look different from the original.
$7.71
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 vibrate a lot?

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

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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 run rough?

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

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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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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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Repair guides for gas walk-behind mowers

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How to rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

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Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your walk-behind mowers

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Types of walk-behind mower blades video

Types of walk-behind mower blades video

Learn about the different kinds of mower blades and how to maintain them.…

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