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Lawn-Boy
Gas Snowblower

Model # 522R (28230-7900001 & UP) Official Lawn-Boy snow thrower

Here are the diagrams and repair parts for Official Lawn-Boy 522R-28230-7900001-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:

  • Click a diagram to see the parts shown on that diagram.
  • 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 388 parts  |
Gear 5-7180
#43

Auger assembly (continued) diagram

Gear

Part #5-7180

$160.73
In Stock
Screw 12-3270
#4

Traction assembly diagram

Screw

Part #12-3270

This item is not returnable
$3.87
In Stock
Bearing Assembly 12-8789

#NI

All parts diagram

Bearing assembly

Part #12-8789

$34.22
In Stock
Worm Bracket 40-8280
#31

Handle assembly left side diagram

Worm bracket

Part #40-8280

Replaced by #40-8280

?
Manufacturer substitution
This part replaces 40-8280. Substitute parts can look different from the original.
$28.03
In Stock
Seal 237-87
#58

Auger assembly (continued) diagram

Seal

Part #237-87

Replaced by #237-87

?
Manufacturer substitution
This part replaces 237-87. Substitute parts can look different from the original.
$11.54
In Stock
Washer 3290-340
#10

Auger assembly diagram

Washer

Part #3290-340

Replaced by #3290-340

?
Manufacturer substitution
This part replaces 3290-340. Substitute parts can look different from the original.
$14.14
In Stock
Mount Selector 39-1280
#25

Handle assembly right side diagram

Mount selector

Part #39-1280

Replaced by #39-1280-03

?
Manufacturer substitution
This part replaces 39-1280. Substitute parts can look different from the original.
$69.67
In Stock
Push Nut 3290-326
#29

Auger assembly (continued) diagram

Push nut

Part #3290-326

Replaced by #3290-326

?
Manufacturer substitution
This part replaces 3290-326. Substitute parts can look different from the original.
$8.34
In Stock
Plate 55-8950
#12

Auger assembly diagram

Plate

Part #55-8950

Replaced by #55-8950

?
Manufacturer substitution
This part replaces 55-8950. Substitute parts can look different from the original.
$15.46
In Stock
Axle Gear 37-6520
#27

Traction assembly diagram

Axle gear

Part #37-6520

Replaced by #37-6520

?
Manufacturer substitution
This part replaces 37-6520. Substitute parts can look different from the original.
$194.68
In Stock

Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

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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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Why won't my snowblower clear snow well?

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

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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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What should I do about a damaged snowblower tire?

Main causes: punctured tire, damaged rim…

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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…

Read more

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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Why does my snowblower engine run rough?

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

Read more

Why does my snowblower stop running after a few seconds?

Main causes: dirty carburetor, stale fuel…

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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…

Read more

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 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.…

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Repair difficulty
Time required
 15 minutes or less
How to rebuild a snowblower carburetor

How to rebuild a snowblower carburetor

Rebuild the carburetor on your snowblower if the engine isn't getting fuel.…

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Repair difficulty
Time required
 45 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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