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Lawn-Boy
Gas Walk-Behind Mower

Model # 680543 Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy 680543 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 185 parts  |
Screw 145498
#20

Handle group diagram

Screw

Part #145498

Replaced by #614697

?
Manufacturer substitution
This part replaces 145498. Substitute parts can look different from the original.
This item is not returnable
$5.29
In Stock
Belt, 21-in 683682
#32

Housing and shroud group diagram

Belt, 21-in

Part #683682

Replaced by #612543-03

?
Manufacturer substitution
This part replaces 683682. Substitute parts can look different from the original.

Get free shipping with Automatic Reorder

$31.17 | 
19% OFF Was : $38.29
In Stock
Screw 611799
#12

Handle group diagram

Screw

Part #611799

Replaced by #611799

?
Manufacturer substitution
This part replaces 611799. Substitute parts can look different from the original.
$9.11
In Stock
Screen 612974
#16

Carburetor group diagram

Screen

Part #612974

Replaced by #612974

?
Manufacturer substitution
This part replaces 612974. Substitute parts can look different from the original.
$12.83
In Stock
Pulley 612564
#10

Handle group diagram

Pulley

Part #612564

Replaced by #612564

?
Manufacturer substitution
This part replaces 612564. Substitute parts can look different from the original.
$10.20
In Stock
Spacer 612503
#9

Carburetor group diagram

Spacer

Part #612503

Replaced by #612503

?
Manufacturer substitution
This part replaces 612503. Substitute parts can look different from the original.
This item is not returnable
$7.29
In Stock
Control Lever 683478
#28

Handle group diagram

Control lever

Part #683478

Replaced by #683478

?
Manufacturer substitution
This part replaces 683478. Substitute parts can look different from the original.
$188.24
In Stock
C.d.ignition 683215
#33

Engine group diagram

C.d.ignition

Part #683215

Replaced by #100-2948

?
Manufacturer substitution
This part replaces 683215. Substitute parts can look different from the original.
$128.89 | 
9% OFF Phone Price : $140.89
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
Retaining Ring 303712
#21

Engine group diagram

Retaining ring

Part #303712

Replaced by #303712

?
Manufacturer substitution
This part replaces 303712. Substitute parts can look different from the original.
This item is not returnable
$5.57
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…

Read more

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…

Read more

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…

Read more
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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