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Lawn-Boy
Gas Walk-Behind Mower

Model # 680540 Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy 680540 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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Model diagram and schematic

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ALL PARTS
Showing 10 of 185 parts  |
Nut 608311
Nut

Part #608311

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

Choke Kit 683781

#NI

All parts diagram

Choke kit

Part #683781

Replaced by #683781

?
Manufacturer substitution
This part replaces 683781. Substitute parts can look different from the original.
$68.69
In Stock
Hex Screw 613233
#30

Engine group diagram

Hex screw

Part #613233

Replaced by #613233

?
Manufacturer substitution
This part replaces 613233. Substitute parts can look different from the original.
This item is not returnable
$7.11
In Stock
Cap Screw 611393
#15

Engine group diagram

Cap screw

Part #611393

Replaced by #611393

?
Manufacturer substitution
This part replaces 611393. Substitute parts can look different from the original.
$35.44
In Stock
Gasket Kit 683778

#NI

All parts diagram

Gasket kit

Part #683778

Replaced by #683778

?
Manufacturer substitution
This part replaces 683778. Substitute parts can look different from the original.
$16.46
In Stock
Control Cable 683943
#18

Handle group diagram

Control cable

Part #683943

Replaced by #683943

?
Manufacturer substitution
This part replaces 683943. Substitute parts can look different from the original.
$144.78
In Stock
Nut 130743
#3

Engine group diagram

Nut

Part #130743

Replaced by #130743

?
Manufacturer substitution
This part replaces 130743. Substitute parts can look different from the original.
This item is not returnable
$5.29
In Stock
Case Control 611777
#6

Handle group diagram

Case control

Part #611777

Replaced by #611777

?
Manufacturer substitution
This part replaces 611777. Substitute parts can look different from the original.
$41.31
In Stock
Bag Assembly 684168

#NI

All parts diagram

Bag assembly

Part #684168

Replaced by #100-6362

?
Manufacturer substitution
This part replaces 684168. Substitute parts can look different from the original.
$217.11
In Stock
Repair Kit 683777

#NI

All parts diagram

Repair kit

Part #683777

Replaced by #683777

?
Manufacturer substitution
This part replaces 683777. Substitute parts can look different from the original.
$15.29
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

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.…

Read more
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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