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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.

There are a couple of ways to find the part or diagram you need:

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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 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

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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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
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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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 15 minutes or less
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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

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