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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  |
Adj Asy Lh 684341
#58

Housing and shroud group diagram

Adj asy lh

Part #684341

Replaced by #684341

?
Manufacturer substitution
This part replaces 684341. Substitute parts can look different from the original.
$259.13
In Stock
Knob 614243
#12

Handle group diagram

Knob

Part #614243

Replaced by #98-7134

?
Manufacturer substitution
This part replaces 614243. Substitute parts can look different from the original.
This item is not returnable
$3.69
In Stock
Cage Nut - 1 613765
#13

Housing and shroud group diagram

Cage nut - 1

Part #613765

Replaced by #613765

?
Manufacturer substitution
This part replaces 613765. Substitute parts can look different from the original.
This item is not returnable
$16.23
In Stock
Screw 307028
#41

Engine group diagram

Screw

Part #307028

Replaced by #614343

?
Manufacturer substitution
This part replaces 307028. Substitute parts can look different from the original.
This item is not returnable
$5.57
In Stock
Screw 612055
#11

Housing and shroud group diagram

Screw

Part #612055

Replaced by #612055

?
Manufacturer substitution
This part replaces 612055. Substitute parts can look different from the original.
$10.20
In Stock
Cap Screw 611393
#20

Engine group diagram

Cap screw

Part #611393

Replaced by #611393

?
Manufacturer substitution
This part replaces 611393. Substitute parts can look different from the original.
$35.44
In Stock
Repair Kit 683777

#NI

All parts diagram

Repair kit

Part #683777

Replaced by #683777

?
Manufacturer substitution
This part replaces 683777. Substitute parts can look different from the original.
$15.29
In Stock
Collar Plate 677525
#21

Housing and shroud group diagram

Collar plate

Part #677525

Replaced by #677525

?
Manufacturer substitution
This part replaces 677525. Substitute parts can look different from the original.
$30.89
In Stock
Idler Pulley 607978
#5

Drive group diagram

Idler pulley

Part #607978

Replaced by #607978

?
Manufacturer substitution
This part replaces 607978. Substitute parts can look different from the original.
$45.80
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

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…

Read more
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

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