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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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  • 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 244 parts  |
Nut 608311
Nut

Part #608311

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

Actuator 611509
#11

Engine group diagram

Actuator

Part #611509

Replaced by #611509

?
Manufacturer substitution
This part replaces 611509. Substitute parts can look different from the original.
$9.00
In Stock
Wrist Pin 606608
#26

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
Throttle Kit 684286

#NI

All parts diagram

Throttle kit

Part #684286

Replaced by #684286

?
Manufacturer substitution
This part replaces 684286. Substitute parts can look different from the original.
$91.51
In Stock
Transmission 684492

#NI

All parts diagram

Transmission

Part #684492

Replaced by #684492

?
Manufacturer substitution
This part replaces 684492. Substitute parts can look different from the original.
$1507.34
In Stock
Key 612066
#52

Housing and shroud group diagram

Key

Part #612066

Replaced by #612066

?
Manufacturer substitution
This part replaces 612066. Substitute parts can look different from the original.
This item is not returnable
$3.51
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
Case Control 611777
#29

Handle group diagram

Case control

Part #611777

Replaced by #611777

?
Manufacturer substitution
This part replaces 611777. Substitute parts can look different from the original.
$41.31
In Stock
Spring 613879
#13

Drive group diagram

Spring

Part #613879

Replaced by #613879

?
Manufacturer substitution
This part replaces 613879. Substitute parts can look different from the original.
$29.04
In Stock
Retainer 611213
#48

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

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…

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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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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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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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