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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 103 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
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.
$8.80
In Stock
Belt, 21-in 683682
#44

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
Retainer 611213
#51

Engine group diagram

Retainer

Part #611213

Replaced by #611213

?
Manufacturer substitution
This part replaces 611213. Substitute parts can look different from the original.
This item is not returnable
$3.86
In Stock
Screw 612428
#7

Housing and shroud group diagram

Screw

Part #612428

Replaced by #612428

?
Manufacturer substitution
This part replaces 612428. Substitute parts can look different from the original.
This item is not returnable
$4.29
In Stock
Spring 611214
#10

Engine group diagram

Spring

Part #611214

Replaced by #611214

?
Manufacturer substitution
This part replaces 611214. Substitute parts can look different from the original.
$16.31
In Stock
Gasket - Exa 613755
#38

Housing and shroud group diagram

Gasket - exa

Part #613755

Replaced by #613755

?
Manufacturer substitution
This part replaces 613755. Substitute parts can look different from the original.
$23.89
In Stock
Handle 614241
#21

Handle group diagram

Handle

Part #614241

Replaced by #614241

?
Manufacturer substitution
This part replaces 614241. Substitute parts can look different from the original.
$205.33
In Stock
Wrist Pin 606608
#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.
$18.71
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…

Read more

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.…

Read more
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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