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Husqvarna
Gas Walk-Behind Mower

Model # 5521BBC Official Husqvarna lawn mower

Here are the diagrams and repair parts for Official Husqvarna 5521BBC lawn mower, as well as links to manuals and error code tables, if available.

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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.

Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 143 parts  |
Locking Flange Nut 873900600
#64

Engine/housing/handle/bag diagram

Locking flange nut

Part #873900600

Replaced by #532409149

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Manufacturer substitution
This part replaces 873900600. Substitute parts can look different from the original.
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Hex Flange Nut 532132010
#15

Wheels/tires/gearcase diagram

Hex flange nut

Part #532132010

Replaced by #532409149

?
Manufacturer substitution
This part replaces 532132010. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
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Hex Nut 532083923
#33

Wheels/tires/gearcase diagram

Hex nut

Part #532083923

Replaced by #532409149

?
Manufacturer substitution
This part replaces 532083923. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
In Stock
Hex Flange Nut 532145212
Hex flange nut

Part #532145212

Replaced by #532409149

?
Manufacturer substitution
This part replaces 532145212. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
In Stock
Dust Cover 532189403
#29

Wheels/tires/gearcase diagram

Dust cover

Part #532189403

Replaced by #581840401

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Manufacturer substitution
This part replaces 532189403. Substitute parts can look different from the original.
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$8.22 | 
11% OFF Phone Price : $9.22
In Stock
Lawn Mower Bolt (replaces 191574) 532191574
#7

Engine/housing/handle/bag diagram

Lawn mower bolt (replaces 191574)

Part #532191574

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Lawn Tractor Hex Lock Nut 873800500
#24

Engine/housing/handle/bag diagram

Lawn tractor hex lock nut

Part #873800500

Replaced by #596040501

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Manufacturer substitution
This part replaces 873800500. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.11
In Stock
Hex Nut 532132004
#5

Engine/housing/handle/bag diagram

Hex nut

Part #532132004

Replaced by #582478602

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Manufacturer substitution
This part replaces 532132004. Substitute parts can look different from the original.
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$2.64 | 
27% OFF Phone Price : $3.64
In Stock
Lawn Mower 21-in Deck Blade (replaces 180459, 5321804-59) 532180459
#31

Engine/housing/handle/bag diagram

Lawn mower 21-in deck blade (replaces 180459, 5321804-59)

Part #532180459

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Get free shipping with Automatic Reorder

$30.65 | 
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In Stock
Craftsman Lawn Mower Washer (replaces 67725) 532067725
#47

Wheels/tires/gearcase diagram

Craftsman lawn mower washer (replaces 67725)

Part #532067725

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Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

View all

Why does my lawn mower run rough?

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Read more

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 vibrate a lot?

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Read more

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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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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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 replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower blade

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

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Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

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Repair difficulty
Time required
 45 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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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

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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