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Lawn-Boy
Gas Walk-Behind Mower

Model # L21ZPNC Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy L21ZPNC 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.

Model diagram and schematic

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ALL PARTS
Showing 10 of 185 parts  |
Clamp 608161
#15

Housing and shroud group diagram

Clamp

Part #608161

Replaced by #608161

?
Manufacturer substitution
This part replaces 608161. Substitute parts can look different from the original.
$20.51
In Stock
Connecting Rod 682970
#14

Engine group diagram

Connecting rod

Part #682970

Replaced by #92-4921

?
Manufacturer substitution
This part replaces 682970. Substitute parts can look different from the original.
$255.18
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
Grommet 605120
#36

Engine group diagram

Grommet

Part #605120

Replaced by #605120

?
Manufacturer substitution
This part replaces 605120. Substitute parts can look different from the original.
This item is not returnable
$6.94
In Stock
Throttle Spring 613142
#6

Carburetor group diagram

Throttle spring

Part #613142

Replaced by #613142

?
Manufacturer substitution
This part replaces 613142. Substitute parts can look different from the original.
$13.06
In Stock
Wheel Tire 684135
#31

Housing and shroud group diagram

Wheel tire

Part #684135

Replaced by #105-8618

?
Manufacturer substitution
This part replaces 684135. Substitute parts can look different from the original.
$86.02
In Stock
Washer 612586
#30

Handle group diagram

Washer

Part #612586

Replaced by #612586

?
Manufacturer substitution
This part replaces 612586. Substitute parts can look different from the original.
This item is not returnable
$5.14
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
Screw 611774
#39

Housing and shroud group diagram

Screw

Part #611774

Replaced by #611774

?
Manufacturer substitution
This part replaces 611774. Substitute parts can look different from the original.
This item is not returnable
$6.97
In Stock
Terminal Spring 510231
#35

Engine group diagram

Terminal spring

Part #510231

Replaced by #684698

?
Manufacturer substitution
This part replaces 510231. Substitute parts can look different from the original.
$14.69
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…

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

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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