Lawn-Boy
Gas Walk-Behind Mower

Model #L21ZSNC Lawn-Boy walk-behind lawn mower

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


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Showing 10 of 244 parts

Baffle Muffler

#12

Housing and shroud group Diagram

Baffle muffler

Part #613892
?
Manufacturer substitution
This part replaces 613892. Substitute parts can look different from the original.
This part replaces 613892
$9.51

In Stock

Shut Off Val

#5

Housing and shroud group Diagram

Shut off val

Part #681818
?
Manufacturer substitution
This part replaces 681818. Substitute parts can look different from the original.
This part replaces 681818
$29.45

In Stock

Throttle Spring

#6

Carburetor group Diagram

Throttle spring

Part #613142
?
Manufacturer substitution
This part replaces 613142. Substitute parts can look different from the original.
This part replaces 613142
This item is not returnable
$3.77

In Stock

Adjustment Bracket

#34

Housing and shroud group Diagram

Adjustment bracket

Part #608833-03
?
Manufacturer substitution
This part replaces 608833. Substitute parts can look different from the original.
This part replaces 608833
$12.43

In Stock

Screw

#38

Engine group Diagram

Screw

Part #32105-12
?
Manufacturer substitution
This part replaces 607526. Substitute parts can look different from the original.
This part replaces 607526
This item is not returnable
$2.36

In Stock

Washer

#31

Housing and shroud group Diagram

Washer

Part #605255
?
Manufacturer substitution
This part replaces 605255. Substitute parts can look different from the original.
This part replaces 605255
This item is not returnable
$2.27

In Stock

Cable

#31

Handle group Diagram

Cable

Part #612567
?
Manufacturer substitution
This part replaces 612567. Substitute parts can look different from the original.
This part replaces 612567
$44.84

In Stock

Spring

#51

Housing and shroud group Diagram

Spring

Part #612067
?
Manufacturer substitution
This part replaces 612067. Substitute parts can look different from the original.
This part replaces 612067
This item is not returnable
$5.94

In Stock

Control Cable

#11

Handle group Diagram

Control cable

Part #683943
?
Manufacturer substitution
This part replaces 683943. Substitute parts can look different from the original.
This part replaces 683943
$59.62

In Stock

Bolster Hous

#14

Housing and shroud group Diagram

Bolster hous

Part #613876
?
Manufacturer substitution
This part replaces 613876. Substitute parts can look different from the original.
This part replaces 613876
This item is not returnable
$3.81

In Stock

Symptoms for gas walk-behind mowers

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

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel
Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade
Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent
Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up
Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key
Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, bad ignition coil

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 replace a lawn mower flywheel key on an OHV engine

The flywheel key couples the flywheel to the engine crankshaft. Replace the flywheel key if it's broken.

Repair difficulty
Time required
 60 minutes or less
April 1, 2013
By Lyle Weischwill
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
April 1, 2013
By Lyle Weischwill
How to replace a lawn mower safety switch

The safety switch stops the engine when you release the lever on the handle. This repair guide explains how to replace it if it's not working correctly.

Repair difficulty
Time required
 30 minutes or less

Articles and videos common to all walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

October 1, 2019

Types of walk-behind mower blades video

By Sears PartsDirect staff

Learn about the different kinds of mower blades and how to maintain them.