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Lawn-Boy
Gas Walk-Behind Mower

Model # S21ZPR Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy S21ZPR 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 185 parts  |
Screw 145498
#20

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
Belt, 21-in 683682
#32

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
Case Control 611777
#6

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
Switch Kit 683968
#47

Engine group diagram

Switch kit

Part #683968

Replaced by #93-4307

?
Manufacturer substitution
This part replaces 683968. Substitute parts can look different from the original.
$64.69
In Stock
Start Handle 612825
#3

Starter group diagram

Start handle

Part #612825

Replaced by #81-1630

?
Manufacturer substitution
This part replaces 612825. Substitute parts can look different from the original.
$27.31
In Stock
Bag Assembly 684168
Bag assembly

Part #684168

Replaced by #100-6362

?
Manufacturer substitution
This part replaces 684168. Substitute parts can look different from the original.
$217.11
In Stock
Retainer 610383
#12

Carburetor group diagram

Retainer

Part #610383

Replaced by #610383

?
Manufacturer substitution
This part replaces 610383. Substitute parts can look different from the original.
$15.49
In Stock
Choke Kit 683781

#NI

All parts diagram

Choke kit

Part #683781

Replaced by #683781

?
Manufacturer substitution
This part replaces 683781. Substitute parts can look different from the original.
$68.69
In Stock
Starter Hub 612949
#2

Starter group diagram

Starter hub

Part #612949

Replaced by #612949

?
Manufacturer substitution
This part replaces 612949. Substitute parts can look different from the original.
$64.69
In Stock
Toe Bar 608175
#35

Housing and shroud group diagram

Toe bar

Part #608175

Replaced by #608175

?
Manufacturer substitution
This part replaces 608175. Substitute parts can look different from the original.
$113.12
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…

Read more

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

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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