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Lawn-Boy
Gas Walk-Behind Mower

Model # L21ZSNC Official Lawn-Boy walk-behind lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy L21ZSNC walk-behind lawn mower, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 244 parts  |
Belt, 21-in 683682
#22

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
Screw 145498
#18

Handle group diagram

Screw

Part #145498

Replaced by #614697

?
Manufacturer substitution
This part replaces 145498. Substitute parts can look different from the original.
This item is not returnable
$5.29
In Stock
Gasket 611827
#42

Drive group diagram

Gasket

Part #611827

Replaced by #611827

?
Manufacturer substitution
This part replaces 611827. Substitute parts can look different from the original.
$18.23
In Stock
Core Plug 609123
#30

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
$5.57
In Stock
Hex Screw 613233
#34

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
$7.11
In Stock
Half Pulley 611837
#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.
$31.24
In Stock
Wire Lead Assembly 683821
#51

Engine group diagram

Wire lead assembly

Part #683821

Replaced by #683821

?
Manufacturer substitution
This part replaces 683821. Substitute parts can look different from the original.
$21.51
In Stock
Screw 611774
#44

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
Nut 608311
Nut

Part #608311

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

Screw 609947
#6

Engine group diagram

Screw

Part #609947

Replaced by #609947

?
Manufacturer substitution
This part replaces 609947. Substitute parts can look different from the original.
$22.23
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…

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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 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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