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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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  • 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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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 269 parts  |
Washer BN-Z37003
Washer

Part #BN-Z37003

Replaced by #936-0119

?
Manufacturer substitution
This part replaces BN-Z37003. Substitute parts can look different from the original.
This item is not returnable
$6.05 | 
14% OFF Phone Price : $7.05
In Stock
Screw BN-Z14003
#48

Rear deck, brakes & wheel drive system diagram

Screw

Part #BN-Z14003

Replaced by #710-0751

?
Manufacturer substitution
This part replaces BN-Z14003. Substitute parts can look different from the original.
This item is not returnable
$5.12 | 
16% OFF Phone Price : $6.12
In Stock
Screw 710-0118
#23

Quick adjust casters diagram

Screw

Part #710-0118

Replaced by #710-3008

?
Manufacturer substitution
This part replaces 710-0118. Substitute parts can look different from the original.
This item is not returnable
$4.62 | 
18% OFF Phone Price : $5.62
In Stock
Washer BN-PL4742
#9C

Transmission diagram

Washer

Part #BN-PL4742

Replaced by #936-0336

?
Manufacturer substitution
This part replaces BN-PL4742. Substitute parts can look different from the original.
$7.71
In Stock
Washer BN-PL4741
#9E

Transmission diagram

Washer

Part #BN-PL4741

Replaced by #936-0337

?
Manufacturer substitution
This part replaces BN-PL4741. Substitute parts can look different from the original.
$7.77
In Stock
Washer BN-PL4756
#9A

Transmission diagram

Washer

Part #BN-PL4756

Replaced by #936-0349

?
Manufacturer substitution
This part replaces BN-PL4756. Substitute parts can look different from the original.
This item is not returnable
$6.11
In Stock
Screen BN-PL4759
#2

Transmission diagram

Screen

Part #BN-PL4759

Replaced by #710-3015

?
Manufacturer substitution
This part replaces BN-PL4759. Substitute parts can look different from the original.
This item is not returnable
$5.12 | 
16% OFF Phone Price : $6.12
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
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

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 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 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 cut unevenly?

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

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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 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 vibrate a lot?

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

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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.…

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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

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

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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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