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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  |
Plate 609989
#5

Deck, shroud and handle group diagram

Plate

Part #609989

Replaced by #609989

?
Manufacturer substitution
This part replaces 609989. Substitute parts can look different from the original.
$199.69
In Stock
Connecting Rod 681434
#12

Engine group diagram

Connecting rod

Part #681434

Replaced by #92-4921

?
Manufacturer substitution
This part replaces 681434. Substitute parts can look different from the original.
$255.18
In Stock
Pin 610016
Pin

Part #610016

Replaced by #610016

?
Manufacturer substitution
This part replaces 610016. Substitute parts can look different from the original.
$91.60
In Stock
Washer 605058
Washer

Part #605058

Replaced by #605058

?
Manufacturer substitution
This part replaces 605058. Substitute parts can look different from the original.
$9.77
In Stock
Screw 610345
#32

Drive group diagram

Screw

Part #610345

Replaced by #610345

?
Manufacturer substitution
This part replaces 610345. Substitute parts can look different from the original.
$15.71
In Stock
Core Plug 609123
#26

Engine group diagram

Core plug

Part #609123

Replaced by #609123

?
Manufacturer substitution
This part replaces 609123. Substitute parts can look different from the original.
This item is not returnable
$5.57
In Stock
Wrist Pin 606608
#19

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
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
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
Screw 607188
Screw

Part #607188

Replaced by #607188

?
Manufacturer substitution
This part replaces 607188. Substitute parts can look different from the original.
This item is not returnable
$6.11
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 vibrate a lot?

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

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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 run rough?

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

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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 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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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 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.…

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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.…

Read more
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.…

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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