Gas Walk-Behind Mower

Model # 10310-3900001 AND UP Official Lawn-Boy lawn mower

Here are the diagrams and repair parts for Official Lawn-Boy 10310-3900001 AND UP lawn mower, as well as links to manuals and error code tables, if available.

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10310-3900001 AND UP Walk-Behind Mowers
Wheel Tire 684776
Wheel tire

Part #684776

Replaced by #684776

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Manufacturer substitution
This part replaces 684776. Substitute parts can look different from the original.
This item is not returnable
$37.96
14% OFF Phone Price : $43.96
In Stock
Washer 614426
#19

Rear axle assembly diagram

Washer

Part #614426

Replaced by #614426

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Manufacturer substitution
This part replaces 614426. Substitute parts can look different from the original.
This item is not returnable
In Stock
Screw 614697
#9

Handle assembly diagram

Screw

Part #614697

Replaced by #614697

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Manufacturer substitution
This part replaces 614697. Substitute parts can look different from the original.
This item is not returnable
In Stock
Belt, 21-in 612543
#12

4 cycle engine, fuel tank & blade assembly diagram

Belt, 21-in

Part #612543

Replaced by #612543-03

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Manufacturer substitution
This part replaces 612543. Substitute parts can look different from the original.

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$31.17
16% OFF Phone Price : $37.17
In Stock
Ring Tsolat 614443
#1

Rear axle assembly diagram

Ring tsolat

Part #614443

Replaced by #614443

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Manufacturer substitution
This part replaces 614443. Substitute parts can look different from the original.
In Stock
Bushing Actuator 614673
#14

Deck & wheel assembly (self propelled) diagram

Bushing actuator

Part #614673

Replaced by #614673

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Manufacturer substitution
This part replaces 614673. Substitute parts can look different from the original.
In Stock
Wheel Tire 92-1042
#18

Rear axle assembly diagram

Wheel tire

Part #92-1042

Replaced by #92-1042

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Manufacturer substitution
This part replaces 92-1042. Substitute parts can look different from the original.
$50.74
11% OFF Phone Price : $56.74
In Stock
Gear 34t 614596
#18

Gear case assembly diagram

Gear 34t

Part #614596

Replaced by #614596

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Manufacturer substitution
This part replaces 614596. Substitute parts can look different from the original.
In Stock
Pin 3285-19
#8

Gear case assembly diagram

Pin

Part #3285-19

Replaced by #3285-19

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Manufacturer substitution
This part replaces 3285-19. Substitute parts can look different from the original.
This item is not returnable
In Stock
Clip Rope 612824
#4

Handle assembly diagram

Clip rope

Part #612824

Replaced by #612824

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Manufacturer substitution
This part replaces 612824. Substitute parts can look different from the original.
This item is not returnable
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.…