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Lawn-Boy
Gas Snowblower

Model # 320 (28220-7900001 & UP) Official Lawn-Boy snow thrower

Here are the diagrams and repair parts for Official Lawn-Boy 320-28220-7900001-UP snow thrower, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

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

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Model diagram and schematic

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ALL PARTS
Showing 10 of 250 parts  |
Toro Screw 12-3270
#25

Rotor housing assembly diagram

Toro screw

Part #12-3270

This item is not returnable
$3.87
In Stock
Nut 3290-225
#8

Handle assembly diagram

Nut

Part #3290-225

Replaced by #3290-225

?
Manufacturer substitution
This part replaces 3290-225. Substitute parts can look different from the original.
$16.74
In Stock
Frame Wa 71-5200
Frame wa

Part #71-5200

Replaced by #71-5200-03

?
Manufacturer substitution
This part replaces 71-5200. Substitute parts can look different from the original.
$184.44
In Stock
Carriage Bolt 3230-22
#1

Upper shroud assembly (continued) diagram

Carriage bolt

Part #3230-22

Replaced by #3230-22

?
Manufacturer substitution
This part replaces 3230-22. Substitute parts can look different from the original.
This item is not returnable
$4.20
In Stock
Screw 32144-53
Screw

Part #32144-53

Replaced by #32144-53

?
Manufacturer substitution
This part replaces 32144-53. Substitute parts can look different from the original.
This item is not returnable
$6.66
In Stock
Screw 32105-15
#12

Rotor housing assembly diagram

Screw

Part #32105-15

Replaced by #32105-15

?
Manufacturer substitution
This part replaces 32105-15. Substitute parts can look different from the original.
This item is not returnable
$3.74
In Stock
Switch 61-4820
#6

Starter motor 28222 (electric) diagram

Switch

Part #61-4820

Replaced by #61-4820

?
Manufacturer substitution
This part replaces 61-4820. Substitute parts can look different from the original.
$23.64
In Stock
Pulley Rotor 71-5410
#24

Rotor housing assembly diagram

Pulley rotor

Part #71-5410

Replaced by #71-5410

?
Manufacturer substitution
This part replaces 71-5410. Substitute parts can look different from the original.
$81.42
In Stock
Nut 3296-39
#13

Rotor housing assembly diagram

Nut

Part #3296-39

Replaced by #3296-39

?
Manufacturer substitution
This part replaces 3296-39. Substitute parts can look different from the original.
This item is not returnable
$4.83
In Stock
Snowblower Engine Plate 71-5290
Snowblower engine plate

Part #71-5290

Replaced by #71-5290-03

?
Manufacturer substitution
This part replaces 71-5290. Substitute parts can look different from the original.
$13.20
In Stock

Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

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What should I do about a damaged snowblower tire?

Main causes: punctured tire, damaged rim…

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Why does my snowblower stop running after a few seconds?

Main causes: dirty carburetor, stale fuel…

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Why does my snowblower engine run rough?

Main causes: dirty carburetor, clogged fuel filter, dirty spark plug, incorrect valve lash, leaky engine gaskets…

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Why won't my snowblower start?

Main causes: stale gas, clogged carburetor, clogged or broken fuel line, dirty spark plug, bad rewind starter, incorrect…

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Why won't my snowblower chute turn?

Main causes: snow build-up in chute, chute drive mechanism failure, bad chute control assembly…

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Why doesn't my snowblower self propel?

Main causes: loose drive clutch cable, damaged drive clutch cable, worn friction disc, scraper blade scraping the ground…

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Why won't my snowblower throw snow far enough?

Main causes: clogged chute, damaged auger blades, broken shear pins, worn auger belt, damaged gear case, engine problems…

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Why doesn't my snowblower auger turn?

Main causes: broken shear pins, worn or loose auger drive belt, auger drive cable failure, damaged auger, bad gear case…

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How do I tune up my snowblower?

Things to do: replace the spark plug, change the oil, rebuild the carburetor, adjust valve lash, adjust or replace the b…

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Repair guides for gas snowblowers

These step-by-step repair guides will help you safely fix what’s broken on your snowblower.

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How to replace a snowblower fuel filter

How to replace a snowblower fuel filter

Replace the fuel filter on your snowblower if it's clogged or damaged.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a snowblower shave plate

How to replace a snowblower shave plate

Follow the 7 easy steps in this repair guide/video to replace a worn out shave plate on your snowblower.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a snowblower chute control gearbox assembly

How to replace a snowblower chute control gearbox assembly

Replace the chute control gearbox on your snowblower if it's stripped or damaged.…

Read more
Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your snowblowers

Use the advice and tips in these articles and videos to get the most out of your snowblower.

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How to make your snowblower last longer

How to make your snowblower last longer

Learn the steps to take to adjust and maintain your snowblower so it lasts longer.…

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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

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