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Lawn-Boy
Gas Walk-Behind Mower

Model # 10202-3900001 AND UP Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy 10202-3900001-AND-UP lawn mower, as well as links to manuals and error code tables, if available.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

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ALL PARTS
Showing 10 of 122 parts  |
Retaining Ring 65-2720
#10

Rear axle assembly diagram

Retaining ring

Part #65-2720

Replaced by #65-2720

?
Manufacturer substitution
This part replaces 65-2720. Substitute parts can look different from the original.
This item is not returnable
$2.16
In Stock
Start Handle 612825
#3

Handle assembly diagram

Start handle

Part #612825

Replaced by #81-1630

?
Manufacturer substitution
This part replaces 612825. Substitute parts can look different from the original.
$25.64
In Stock
Cage Nut - 1 613765
Cage nut - 1

Part #613765

Replaced by #613765

?
Manufacturer substitution
This part replaces 613765. Substitute parts can look different from the original.
This item is not returnable
$15.23
In Stock
Rope Guide 92-1021
#2

Handle assembly diagram

Rope guide

Part #92-1021

Replaced by #86-9671

?
Manufacturer substitution
This part replaces 92-1021. Substitute parts can look different from the original.
This item is not returnable
$7.09 | 
12% OFF Phone Price : $8.09
In Stock
Danger Decal 39-5770
Danger decal

Part #39-5770

Replaced by #39-5770

?
Manufacturer substitution
This part replaces 39-5770. Substitute parts can look different from the original.
$14.14
In Stock
Thrust Washer 36-4791
#5

Gear case assembly diagram

Thrust washer

Part #36-4791

Replaced by #36-4791

?
Manufacturer substitution
This part replaces 36-4791. Substitute parts can look different from the original.
This item is not returnable
$3.74
In Stock
Knob 614682
Knob

Part #614682

Replaced by #98-8332

?
Manufacturer substitution
This part replaces 614682. Substitute parts can look different from the original.
This item is not returnable
$8.17
In Stock
Washer 40-1940
Washer

Part #40-1940

Replaced by #40-1940

?
Manufacturer substitution
This part replaces 40-1940. Substitute parts can look different from the original.
This item is not returnable
$3.09
In Stock
Washer 614426
#19

Rear axle assembly diagram

Washer

Part #614426

Replaced by #614426

?
Manufacturer substitution
This part replaces 614426. Substitute parts can look different from the original.
This item is not returnable
$2.40
In Stock
Gear 65-4750
#14

Rear axle assembly diagram

Gear

Part #65-4750

Replaced by #65-4750

?
Manufacturer substitution
This part replaces 65-4750. Substitute parts can look different from the original.
$18.11
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 run rough?

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

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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 vibrate a lot?

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

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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…

Read more

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 move?

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

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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 spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

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

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

Read more
Repair difficulty
Time required
 45 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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Tapping into a new feature in the Search Bar on Sears PartsDirect

Tapping into a new feature in the Search Bar on Sears PartsDirect

Learn about a new feature added to the Search Bar on Sears PartsDirect…

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Introducing new technical repair content that we’re developing for the Sears Technical Institute

Introducing new technical repair content that we’re developing for the Sears Technical Institute

Learn about Sears Technical Institute and the advanced technical content being developed for aspiring appliance techs.…

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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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