Lawn-Boy
Gas Walk-Behind Mower

Model #10321-790001 & UP Lawn-Boy lawn mower

Here are the repair parts and diagrams for your Lawn-Boy 10321-790001-UP lawn mower. 

The diagram(s) below can help you find the right part.  If you’d like help, we invite you to call our customer service number at the top of the page, or click chat.

On this page, you can also find any manuals, installation guides and error code tables associated with this model.

For advice on diagnosing problems with appliances, lawn & garden equipment and other products, check out the videos, repair guides and articles in our DIY section.

Save to my profile

Showing 10 of 109 parts

Oil Decal

#5

Engine assembly Diagram

Oil decal

Part #92-4851

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

Pinion

#15

Gear assembly Diagram

Pinion

Part #60-8890

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

Decal

#14

Engine assembly Diagram

Decal

Part #65-2690

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

Screw

#26

Housing assembly Diagram

Screw

Part #92-9665

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

Traction Cable

#7

Handle assembly Diagram

Traction cable

Part #92-7726

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

Wheel Cover

#18

Rear axle assembly Diagram

Wheel cover

Part #94-1609

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

Drive Cover

#27

Housing assembly Diagram

Drive cover

Part #614671

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

Discharge Decal

#34

Housing assembly Diagram

Discharge decal

Part #92-1097

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

Washer

#14

Rear axle assembly Diagram

Washer

Part #65-4730

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

Pin

#4

Gear assembly Diagram

Pin

Part #3285-19

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

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel
Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade
Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent
Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up
Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key
Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, bad ignition coil

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.

March 1, 2016
By Lyle Weischwill
How to replace a lawn mower drive cable

The drive cable engages the transmission to spin the drive wheels and move the mower across the grass. Replace the drive cable if it's broken or frozen up inside the sheath.

Repair difficulty
Time required
 60 minutes or less
April 1, 2013
By Lyle Weischwill
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
April 1, 2013
By Lyle Weischwill
How to replace a lawn mower safety switch

The safety switch stops the engine when you release the lever on the handle. This repair guide explains how to replace it if it's not working correctly.

Repair difficulty
Time required
 30 minutes or less

Articles and videos common to all walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

October 1, 2019

Types of walk-behind mower blades video

By Sears PartsDirect staff

Learn about the different kinds of mower blades and how to maintain them.