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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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  • 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  |
Knob Spring 682231
#22

Housing and shroud group diagram

Knob spring

Part #682231

Replaced by #682231

?
Manufacturer substitution
This part replaces 682231. Substitute parts can look different from the original.
$36.64
In Stock
Core Plug 609123
#26

Engine group diagram

Core plug

Part #609123

Replaced by #609123

?
Manufacturer substitution
This part replaces 609123. Substitute parts can look different from the original.
This item is not returnable
$5.26
In Stock
Bag 684333

#NI

All parts diagram

Bag

Part #684333

Replaced by #100-6362

?
Manufacturer substitution
This part replaces 684333. Substitute parts can look different from the original.
$203.87
In Stock
Retainer 610165
#3

Carburetor group diagram

Retainer

Part #610165

Replaced by #610165

?
Manufacturer substitution
This part replaces 610165. Substitute parts can look different from the original.
$8.26
In Stock
Rod 608160
#10

Housing and shroud group diagram

Rod

Part #608160

Replaced by #608160

?
Manufacturer substitution
This part replaces 608160. Substitute parts can look different from the original.
$18.20
In Stock
Switch Kit 683968
#47

Engine group diagram

Switch kit

Part #683968

Replaced by #93-4307

?
Manufacturer substitution
This part replaces 683968. Substitute parts can look different from the original.
$60.73
In Stock
Start Handle 612825
#3

Starter group diagram

Start handle

Part #612825

Replaced by #81-1630

?
Manufacturer substitution
This part replaces 612825. Substitute parts can look different from the original.
$25.64
In Stock
Hex Screw 609891
Hex screw

Part #609891

Replaced by #700138

?
Manufacturer substitution
This part replaces 609891. Substitute parts can look different from the original.
This item is not returnable
$4.65
In Stock
Decal 610640
#49

Housing and shroud group diagram

Decal

Part #610640

Replaced by #43-8480

?
Manufacturer substitution
This part replaces 610640. Substitute parts can look different from the original.
$11.49
In Stock
Element 609493
#10

Carburetor group diagram

Element

Part #609493

Replaced by #107-4621

?
Manufacturer substitution
This part replaces 609493. Substitute parts can look different from the original.
This item is not returnable
$7.03
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…

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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Tapping into a new feature in the Search Bar on Sears PartsDirect

Tapping into a new feature in the Search Bar on Sears PartsDirect

Learn about a new feature added to the Search Bar on Sears PartsDirect…

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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

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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