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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4502 Walk-Behind Mowers
Idler Pulley 607978
#58

Drive group diagram

Idler pulley

Part #607978

Replaced by #607978

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Manufacturer substitution
This part replaces 607978. Substitute parts can look different from the original.
In Stock
Pin 610016
Pin

Part #610016

Replaced by #610016

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Manufacturer substitution
This part replaces 610016. Substitute parts can look different from the original.
In Stock
Needle Seal 681741
#59

Engine group diagram

Needle seal

Part #681741

Replaced by #92-9697

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Manufacturer substitution
This part replaces 681741. Substitute parts can look different from the original.
In Stock
Muffler Screw 607601
Muffler screw

Part #607601

Replaced by #607601

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Manufacturer substitution
This part replaces 607601. Substitute parts can look different from the original.
This item is not returnable
In Stock
Gas Fuel Cap 609150
#72

Engine group diagram

Gas fuel cap

Part #609150

Replaced by #609150

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Manufacturer substitution
This part replaces 609150. Substitute parts can look different from the original.
In Stock
Washer 605058
Washer

Part #605058

Replaced by #605058

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Manufacturer substitution
This part replaces 605058. Substitute parts can look different from the original.
In Stock
Spring 604257
#42

Engine group diagram

Spring

Part #604257

Replaced by #604257

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Manufacturer substitution
This part replaces 604257. Substitute parts can look different from the original.
In Stock
Collar Plate 677525
Collar plate

Part #677525

Replaced by #677525

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Manufacturer substitution
This part replaces 677525. Substitute parts can look different from the original.
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.
In Stock
Retainer 610383
#69

Engine group diagram

Retainer

Part #610383

Replaced by #610383

?
Manufacturer substitution
This part replaces 610383. 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.…