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Yard-Man
Gas Walk-Behind Mower

Model # 551-059M400 Official Yard-Man lawn mower

Here are the diagrams and repair parts for Official Yard-Man 551-059M400 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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For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

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ALL PARTS
Showing 10 of 243 parts  |
Yard-man Plain Washer FF3180
#51A

Transmission diagram

Yard-man plain washer

Part #FF3180

This item is not returnable
$2.16
In Stock
Yard-man Parts List 770-7670F

#NI

All parts diagram

Yard-man parts list

Part #770-7670F

This item is not returnable
$5.99
In Stock
Yard-man Plain Washer FF3184
#51E

Transmission diagram

Yard-man plain washer

Part #FF3184

This item is not returnable
$2.16
In Stock
Yard-man Owner's Manual 770-7669F

#NI

All parts diagram

Yard-man owner's manual

Part #770-7669F

This item is not returnable
$5.99
In Stock
Yard-man Seal Felt FF5130
#43

Transmission diagram

Yard-man seal felt

Part #FF5130

This item is not returnable
$2.33
In Stock
Yard-man 5/16-18x4-3 710-0974
#57

Rear deck, brakes & wheel drive system diagram

Yard-man 5/16-18x4-3

Part #710-0974

$20.74
In Stock
Filter BN-PM244
#10

Fuel tank diagram

Filter

Part #BN-PM244

The manufacturer no longer makes this part, and there's no substitute part

Belt BN-PL8001
#50

Rear deck, brakes & wheel drive system diagram

Belt

Part #BN-PL8001

The manufacturer no longer makes this part, and there's no substitute part

Spring BN-PET078
#33

Handle assembly diagram

Spring

Part #BN-PET078

The manufacturer no longer makes this part, and there's no substitute part

Pulley BN-PL4716
#44

Rear deck, brakes & wheel drive system diagram

Pulley

Part #BN-PL4716

The manufacturer no longer makes this part, and there's no substitute part

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

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 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

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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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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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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