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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Browse Parts for
L21ZPNC Walk-Behind Mowers
Belt, 21-in 683682
#44

Housing and shroud group diagram

Belt, 21-in

Part #683682

Replaced by #612543-03

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

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In Stock
Screw 145498
#20

Handle group diagram

Screw

Part #145498

Replaced by #614697

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Manufacturer substitution
This part replaces 145498. Substitute parts can look different from the original.
This item is not returnable
In Stock
Retainer 610165
#3

Carburetor group diagram

Retainer

Part #610165

Replaced by #610165

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Manufacturer substitution
This part replaces 610165. Substitute parts can look different from the original.
In Stock
Retaining Ring 303712
#21

Engine group diagram

Retaining ring

Part #303712

Replaced by #303712

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Manufacturer substitution
This part replaces 303712. Substitute parts can look different from the original.
This item is not returnable
In Stock
Case Assembly 683819
#52

Engine group diagram

Case assembly

Part #683819

Replaced by #93-4301

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Manufacturer substitution
This part replaces 683819. Substitute parts can look different from the original.
In Stock
Recoil Spring 683897
#6

Starter group diagram

Recoil spring

Part #683897

Replaced by #92-4935

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Manufacturer substitution
This part replaces 683897. Substitute parts can look different from the original.
In Stock
Knob Spring 682231
#22

Housing and shroud group diagram

Knob spring

Part #682231

Replaced by #682231

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Manufacturer substitution
This part replaces 682231. Substitute parts can look different from the original.
In Stock
Plate 602587
#28

Engine group diagram

Plate

Part #602587

Replaced by #602587

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Manufacturer substitution
This part replaces 602587. Substitute parts can look different from the original.
This item is not returnable
In Stock
Repair Kit 683777

#NI

All parts diagram

Repair kit

Part #683777

Replaced by #683777

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Manufacturer substitution
This part replaces 683777. Substitute parts can look different from the original.
In Stock
Clip Rope 612824
#4

Starter group diagram

Clip rope

Part #612824

Replaced by #612824

?
Manufacturer substitution
This part replaces 612824. Substitute parts can look different from the original.
This item is not returnable
In Stock

Symptoms for gas walk-behind mowers

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

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

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, ba…

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

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 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.…

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.…

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.…

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.

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.…

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.…

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.…