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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  |
Screw BN-Z24014
Screw

Part #BN-Z24014

Replaced by #710-3144

?
Manufacturer substitution
This part replaces BN-Z24014. Substitute parts can look different from the original.
This item is not returnable
$5.64 | 
15% OFF Phone Price : $6.64
In Stock
Screw BN-Z24006
Screw

Part #BN-Z24006

Replaced by #710-0514

?
Manufacturer substitution
This part replaces BN-Z24006. Substitute parts can look different from the original.
This item is not returnable
$5.33 | 
16% OFF Phone Price : $6.33
In Stock
Screw BN-Z70003
#39

48" & 52" blade belt drive system diagram

Screw

Part #BN-Z70003

Replaced by #712-0429

?
Manufacturer substitution
This part replaces BN-Z70003. Substitute parts can look different from the original.
This item is not returnable
$7.06
In Stock
Screw BN-Z19010
#12

Rear wheel diagram

Screw

Part #BN-Z19010

Replaced by #710-0376

?
Manufacturer substitution
This part replaces BN-Z19010. Substitute parts can look different from the original.
This item is not returnable
$5.11 | 
16% OFF Phone Price : $6.11
In Stock
Lock Washer BN-Z37004
Lock washer

Part #BN-Z37004

Replaced by #736-0169

?
Manufacturer substitution
This part replaces BN-Z37004. Substitute parts can look different from the original.
This item is not returnable
$5.26
In Stock
Pin BN-PM462
#4

Quick adjust casters diagram

Pin

Part #BN-PM462

Replaced by #714-0143A

?
Manufacturer substitution
This part replaces BN-PM462. Substitute parts can look different from the original.
This item is not returnable
$9.95 | 
9% OFF Phone Price : $10.95
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 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

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

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

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