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Lawn-Boy
Gas Walk-Behind Mower

Model # 10301-3900001 AND UP Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy 10301-3900001-AND-UP 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 44 parts  |
Base Shroud 614675
#3

2 cycle engine assembly diagram

Base shroud

Part #614675

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

Handle Bracket 684746
#10

Deck & wheel assembly (hand push) diagram

Handle bracket

Part #684746

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

Cylinder & Crankcase Cover 684724
#15

2 cycle engine assembly diagram

Cylinder & crankcase cover

Part #684724

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

Cover Plate, Mulch 61454
#1

Deck & wheel assembly (hand push) diagram

Cover plate, mulch

Part #61454

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

Needle Brg S 683911
#12

2 cycle engine assembly diagram

Needle brg s

Part #683911

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

Key 66-6040
#13A

Rear axle assembly diagram

Key

Part #66-6040

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

Screw 614636
#14

2 cycle engine assembly diagram

Screw

Part #614636

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

Muffler Cover 614674
#22

2 cycle engine assembly diagram

Muffler cover

Part #614674

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

Float Assembly 683783

#NI

All parts diagram

Float assembly

Part #683783

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

Screw 602480
#22

Rear axle assembly diagram

Screw

Part #602480

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.

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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.…

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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.…

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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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