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Husqvarna
Gas Walk-Behind Mower

Model # 55R21HVB Official Husqvarna lawn mower

Here are the diagrams and repair parts for Official Husqvarna 55R21HVB lawn mower, as well as links to manuals and error code tables, if available.

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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.

Owner’s manual

Model diagram and schematic

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Showing 10 of 125 parts  |
Hex Flange Nut 532132010
#20

Wheels/tires/belt/drive cover diagram

Hex flange nut

Part #532132010

Replaced by #532409149

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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
In Stock
Hex Nut 532083923
#33

Wheels/tires/belt/drive cover 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
#24

Wheels/tires/belt/drive cover diagram

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
Handle Bolt 532184568
#39

Engine/housing/bag/handle/chute diagram

Handle bolt

Part #532184568

Replaced by #532191574

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Manufacturer substitution
This part replaces 532184568. Substitute parts can look different from the original.
BEST SELLER
$7.98 | 
11% OFF Phone Price : $8.98
In Stock
Hex Nut 532132004
#16

Wheels/tires/belt/drive cover 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.
BEST SELLER
This item is not returnable
$2.64 | 
27% OFF Phone Price : $3.64
In Stock
Grass Bag Door 532190581
#7

Engine/housing/bag/handle/chute diagram

Grass bag door

Part #532190581

Replaced by #583708701

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Manufacturer substitution
This part replaces 532190581. Substitute parts can look different from the original.
$37.98 | 
14% OFF Phone Price : $43.98
In Stock
E-ring 812000058
#38

Wheels/tires/belt/drive cover diagram

E-ring

Part #812000058

This item is not returnable
$5.11
In Stock
Lawn Mower Bolt 872140405
#9

Engine/housing/bag/handle/chute diagram

Lawn mower bolt

Part #872140405

This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
In Stock
Screw.ta 817060410
#29

Wheels/tires/belt/drive cover diagram

Screw.ta

Part #817060410

This item is not returnable
$6.83
In Stock
E-ring 812000014
#6

Engine/housing/bag/handle/chute diagram

E-ring

Part #812000014

This item is not returnable
$6.83
In Stock

Symptoms for gas walk-behind mowers

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

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Why does my lawn mower run rough?

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

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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…

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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…

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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

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