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Lawn-Boy
Gas Walk-Behind Mower

Model # 10304-7900001 AND UP Official Lawn-Boy walk-behind lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy 10304-7900001-AND-UP walk-behind lawn mower, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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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 214 parts  |
Rope Guide 93-7383
#16

Handle assembly diagram

Rope guide

Part #93-7383

Replaced by #86-9671

?
Manufacturer substitution
This part replaces 93-7383. Substitute parts can look different from the original.
This item is not returnable
$5.74 | 
19% OFF Was : $7.09
Back Order
Lock Nut 3296-29
Lock nut

Part #3296-29

The manufacturer no longer makes this part, and there's no substitute part

Screw 95-1726
#3

Engine assembly diagram

Screw

Part #95-1726

Replaced by #95-1726

?
Manufacturer substitution
This part replaces 95-1726. Substitute parts can look different from the original.
This item is not returnable
$3.74
In Stock
Primer 66-7460
#19

Engine assembly diagram

Primer

Part #66-7460

Replaced by #66-7460

?
Manufacturer substitution
This part replaces 66-7460. Substitute parts can look different from the original.
This item is not returnable
$8.49
In Stock
Lawn Mower Grass Bag 89804

#NI

All parts diagram

Lawn mower grass bag

Part #89804

$24.31
In Stock
Float Chamber 92-9691
#18

Carburetor assembly diagram

Float chamber

Part #92-9691

Replaced by #92-9691

?
Manufacturer substitution
This part replaces 92-9691. Substitute parts can look different from the original.
$56.00
In Stock
Governor Spring 92-4944
#5

Carburetor assembly diagram

Governor spring

Part #92-4944

Replaced by #92-4944

?
Manufacturer substitution
This part replaces 92-4944. Substitute parts can look different from the original.
$17.46
In Stock
Drive Cover 614671
#9

Cover assembly (for 10304 only) diagram

Drive cover

Part #614671

Replaced by #92-8649

?
Manufacturer substitution
This part replaces 614671. Substitute parts can look different from the original.
$29.49
In Stock
Screw 32144-4
#1

Gear case assembly (10304 only) diagram

Screw

Part #32144-4

Replaced by #32144-4

?
Manufacturer substitution
This part replaces 32144-4. Substitute parts can look different from the original.
This item is not returnable
$2.66
In Stock
Liner 677982
#8

Engine assembly diagram

Liner

Part #677982

Replaced by #677982

?
Manufacturer substitution
This part replaces 677982. Substitute parts can look different from the original.
$60.82
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…

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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 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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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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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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