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Lawn-Boy
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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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 185 parts  |
Nut 130743
#3

Engine group diagram

Nut

Part #130743

Replaced by #130743

?
Manufacturer substitution
This part replaces 130743. Substitute parts can look different from the original.
This item is not returnable
$5.29
In Stock
Handle 614241
#21

Handle group diagram

Handle

Part #614241

Replaced by #614241

?
Manufacturer substitution
This part replaces 614241. Substitute parts can look different from the original.
$205.33
In Stock
Wrist Pin 606608
#20

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
Clamp 608161
#15

Housing and shroud group diagram

Clamp

Part #608161

Replaced by #608161

?
Manufacturer substitution
This part replaces 608161. Substitute parts can look different from the original.
$20.51
In Stock
Lever Knob 683663
#31

Handle group diagram

Lever knob

Part #683663

Replaced by #683663

?
Manufacturer substitution
This part replaces 683663. Substitute parts can look different from the original.
$32.82
In Stock
Connecting Rod 682970
#14

Engine group diagram

Connecting rod

Part #682970

Replaced by #92-4921

?
Manufacturer substitution
This part replaces 682970. Substitute parts can look different from the original.
$255.18
In Stock
Lead 681678
#34

Engine group diagram

Lead

Part #681678

Replaced by #681678

?
Manufacturer substitution
This part replaces 681678. Substitute parts can look different from the original.
$39.49
In Stock
Screw 606733
#55

Housing and shroud group diagram

Screw

Part #606733

Replaced by #606733

?
Manufacturer substitution
This part replaces 606733. Substitute parts can look different from the original.
$16.57
In Stock
Lock Washer 316959
#4

Engine group diagram

Lock washer

Part #316959

Replaced by #3253-6

?
Manufacturer substitution
This part replaces 316959. Substitute parts can look different from the original.
This item is not returnable
$2.16
In Stock
Retainer 610165
#3

Carburetor group diagram

Retainer

Part #610165

Replaced by #610165

?
Manufacturer substitution
This part replaces 610165. Substitute parts can look different from the original.
$8.80
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

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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