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Lawn-Boy
Gas Walk-Behind Mower

Model # 4502 Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy 4502 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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Model diagram and schematic

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ALL PARTS
Showing 10 of 189 parts  |
Idler Pulley 607978
#58

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
Retaining Ring 303712
#20

Engine group diagram

Retaining ring

Part #303712

Replaced by #303712

?
Manufacturer substitution
This part replaces 303712. Substitute parts can look different from the original.
This item is not returnable
$5.57
In Stock
Spring 604257
#42

Engine group diagram

Spring

Part #604257

Replaced by #604257

?
Manufacturer substitution
This part replaces 604257. Substitute parts can look different from the original.
$64.47
In Stock
Retaining Ring 607676
#25

Drive group diagram

Retaining ring

Part #607676

Replaced by #607676

?
Manufacturer substitution
This part replaces 607676. Substitute parts can look different from the original.
$9.77
In Stock
Adjusting Collar 610834
#64

Engine group diagram

Adjusting collar

Part #610834

Replaced by #610834

?
Manufacturer substitution
This part replaces 610834. Substitute parts can look different from the original.
This item is not returnable
$6.74
In Stock
Pulley 609976
#33

Drive group diagram

Pulley

Part #609976

Replaced by #609976

?
Manufacturer substitution
This part replaces 609976. Substitute parts can look different from the original.
$131.30
In Stock
Washer 605255
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
$2.77
In Stock
Pulley 610035
#9

Drive group diagram

Pulley

Part #610035

Replaced by #610035

?
Manufacturer substitution
This part replaces 610035. Substitute parts can look different from the original.
$213.75
In Stock
Screw 307028
#39

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
Needle Seal 681741
#59

Engine group diagram

Needle seal

Part #681741

Replaced by #92-9697

?
Manufacturer substitution
This part replaces 681741. Substitute parts can look different from the original.
$23.47
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 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 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 cut unevenly?

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

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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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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 vibrate a lot?

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

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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 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.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower transmission

How to replace a lawn mower transmission

Learn how to replace the transmission on your lawn mower if it's locked up or won't drive the wheels.…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower carburetor

How to replace a lawn mower carburetor

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

Read more
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.

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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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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.…

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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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