Lawn-Boy
Gas Walk-Behind Mower

Model #680544 Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Lawn-Boy 680544 lawn mower, as well as links to manuals and error code tables, if available.

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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.

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Parts List

Showing 10 of 252 parts

2-Cycle Engine Oil, 6-pack (replaces 36552)

#NI

All parts Diagram

2 cycle oil

Part #33600
Replaced by #21603
?
Manufacturer substitution
This part replaces 33600. Substitute parts can look different from the original.
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This item is not returnable

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In Stock
$4.99 | 
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MSRP: $9.99
Washer#17

Drive group Diagram

Washer

Part #609005

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

Lawn Mower Handle Knob#12

Handle group Diagram

Knob

Part #614243
Replaced by #98-7134
?
Manufacturer substitution
This part replaces 614243. Substitute parts can look different from the original.
This item is not returnable
In Stock
$3.29
Wrist Pin#20

Engine group Diagram

Wrist pin

Part #606608
Replaced by #94-5774
?
Manufacturer substitution
This part replaces 606608. Substitute parts can look different from the original.
In Stock
$17.57
Half Pulley#12

Drive group Diagram

Half pulley

Part #611837
Replaced by #611837
?
Manufacturer substitution
This part replaces 611837. Substitute parts can look different from the original.
In Stock
$29.31
Tie Strap#9

Rear grass catcher group Diagram

Lock strap

Part #612740
Replaced by #92-1039
?
Manufacturer substitution
This part replaces 612740. Substitute parts can look different from the original.
In Stock
$36.71
Choke Kit

#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.
In Stock
$64.49
Throttle Kit

#NI

All parts Diagram

Throttle kit

Part #684286
Replaced by #684286
?
Manufacturer substitution
This part replaces 684286. Substitute parts can look different from the original.
In Stock
$85.91
Hex Screw#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
In Stock
$6.69
Spring#10

Engine group Diagram

Spring

Part #611214
Replaced by #611214
?
Manufacturer substitution
This part replaces 611214. Substitute parts can look different from the original.
In Stock
$15.31

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade
Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up
Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key
Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent
Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel
Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, bad ignition coil

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.

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 cracked.

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged.

Repair difficulty
Time required
 15 minutes or less
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 replace this tiny but essential part.

Repair difficulty
Time required
 45 minutes or less

Articles and videos common to all 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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