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.

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Model diagram and schematic

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Showing 10 of 250 parts  |

Nut 32149-1
#40

Upper shroud assembly (continued) diagram

Nut

Part #32149-1

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

Lock Nut 3296-29
Lock nut

Part #3296-29

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

Primer 66-7460
#12

Upper shroud assembly (continued) 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
In Stock
Toro Screw 12-3270
#25

Rotor housing assembly diagram

Toro screw

Part #12-3270

This item is not returnable
In Stock
Cap Screw 323-44
#17

Rotor housing assembly diagram

Cap screw

Part #323-44

Replaced by #323-44

?
Manufacturer substitution
This part replaces 323-44. Substitute parts can look different from the original.
In Stock
Half Shear Cap 71-5060
Half shear cap

Part #71-5060

Replaced by #71-5060

?
Manufacturer substitution
This part replaces 71-5060. Substitute parts can look different from the original.
In Stock
Danger Decal 94-2900
#3

Upper shroud assembly (continued) diagram

Danger decal

Part #94-2900

Replaced by #104-4135

?
Manufacturer substitution
This part replaces 94-2900. Substitute parts can look different from the original.
In Stock
Plate 55-8950
#6

Upper shroud assembly (continued) diagram

Plate

Part #55-8950

Replaced by #55-8950

?
Manufacturer substitution
This part replaces 55-8950. Substitute parts can look different from the original.
In Stock
Washer 3256-70
#39

Upper shroud assembly (continued) diagram

Washer

Part #3256-70

Replaced by #3256-70

?
Manufacturer substitution
This part replaces 3256-70. Substitute parts can look different from the original.
This item is not returnable
In Stock
Gear Cover 70-7850
#15

Starter motor 28222 (electric) diagram

Gear cover

Part #70-7850

Replaced by #70-7850

?
Manufacturer substitution
This part replaces 70-7850. Substitute parts can look different from the original.
In Stock

Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

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

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

Main causes: dirty carburetor, stale fuel…

Main causes: punctured tire, damaged rim…

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

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

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

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

Main causes: clogged chute, snow build-up in auger housing, broken auger shear pins, auger drive belt needs adjustment, …

Repair guides for gas snowblowers

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

How to adjust snowblower engine valve lash

How to adjust snowblower engine valve lash

Adjust the engine valve lash on your snowblower to keep the engine starting and running smoothly.…

Repair difficulty
Time required
 15 minutes or less
How to adjust snowblower skid shoes

How to adjust snowblower skid shoes

To prevent snowblower auger and shave plate damage, adjust the skid shoes regularly to keep the shave plate ¼-inch high.…

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.…

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.

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.…

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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