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
Belt, 21-in 683682
#32

Housing and shroud group diagram

Belt, 21-in

Part #683682

Replaced by #612543-03

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Manufacturer substitution
This part replaces 683682. Substitute parts can look different from the original.

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In Stock
Screw 145498
#20

Handle group diagram

Screw

Part #145498

Replaced by #614697

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Manufacturer substitution
This part replaces 145498. Substitute parts can look different from the original.
This item is not returnable
In Stock
Throttle Kit 684286

#NI

All parts diagram

Throttle kit

Part #684286

Replaced by #684286

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Manufacturer substitution
This part replaces 684286. Substitute parts can look different from the original.
In Stock
Bag 684333

#NI

All parts diagram

Bag

Part #684333

Replaced by #100-6362

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Manufacturer substitution
This part replaces 684333. Substitute parts can look different from the original.
In Stock
Control Cable 683943
#18

Handle group diagram

Control cable

Part #683943

Replaced by #683943

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Manufacturer substitution
This part replaces 683943. Substitute parts can look different from the original.
In Stock
Retaining Ring 303712
#21

Engine group diagram

Retaining ring

Part #303712

Replaced by #303712

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Manufacturer substitution
This part replaces 303712. 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

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Manufacturer substitution
This part replaces 683778. Substitute parts can look different from the original.
In Stock
Washer 605255
#23

Housing and shroud group diagram

Washer

Part #605255

Replaced by #605255

?
Manufacturer substitution
This part replaces 605255. Substitute parts can look different from the original.
This item is not returnable
In Stock
Wire Lead Assembly 683821
#50

Engine group diagram

Wire lead assembly

Part #683821

Replaced by #683821

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Manufacturer substitution
This part replaces 683821. Substitute parts can look different from the original.
In Stock
Actuator 611509
#43

Engine group diagram

Actuator

Part #611509

Replaced by #611509

?
Manufacturer substitution
This part replaces 611509. Substitute parts can look different from the original.
In Stock

Symptoms for gas walk-behind mowers

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

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

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

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

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

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

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

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.…

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