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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S21ZPR Walk-Behind Mowers
Core Plug 609123
#26

Engine group diagram

Core plug

Part #609123

Replaced by #609123

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Manufacturer substitution
This part replaces 609123. Substitute parts can look different from the original.
This item is not returnable
In Stock
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
In Stock
Key 607199
#13

Engine group diagram

Key

Part #607199

Replaced by #607199

?
Manufacturer substitution
This part replaces 607199. Substitute parts can look different from the original.
In Stock
Case Assembly 683819
#52

Engine group diagram

Case assembly

Part #683819

Replaced by #93-4301

?
Manufacturer substitution
This part replaces 683819. Substitute parts can look different from the original.
In Stock
Screw 611774
#9

Housing and shroud group diagram

Screw

Part #611774

Replaced by #611774

?
Manufacturer substitution
This part replaces 611774. Substitute parts can look different from the original.
This item is not returnable
In Stock
Gasket Kit 683778

#NI

All parts diagram

Gasket kit

Part #683778

Replaced by #683778

?
Manufacturer substitution
This part replaces 683778. Substitute parts can look different from the original.
In Stock
Hanger 613455
#3

Rear grass catcher group diagram

Hanger

Part #613455

Replaced by #613455

?
Manufacturer substitution
This part replaces 613455. Substitute parts can look different from the original.
$85.87
7% OFF Phone Price : $91.87
In Stock
Washer 308052
#7

Carburetor group diagram

Washer

Part #308052

Replaced by #308052

?
Manufacturer substitution
This part replaces 308052. Substitute parts can look different from the original.
This item is not returnable
In Stock
Bracket 611192
#45

Engine group diagram

Bracket

Part #611192

Replaced by #611192

?
Manufacturer substitution
This part replaces 611192. Substitute parts can look different from the original.
In Stock
Screw 605522
#2

Carburetor group diagram

Screw

Part #605522

Replaced by #605522

?
Manufacturer substitution
This part replaces 605522. Substitute parts can look different from the original.
This item is not returnable
In Stock

Symptoms for gas walk-behind mowers

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

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

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 rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

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

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.

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.…

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.…

Types of walk-behind mower blades video

Types of walk-behind mower blades video

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