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Husqvarna
Gas Walk-Behind Mower

Model # 55R21HVA Official Husqvarna rotary lawn mower

Here are the diagrams and repair parts for Official Husqvarna 55R21HVA rotary 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.

Model diagram and schematic

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ALL PARTS
Showing 10 of 123 parts  |
Hex Flange Nut 532132010
#20

Wheels/tires/belt 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 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 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/handle/bag diagram

Handle bolt

Part #532184568

Replaced by #532191574

?
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
Grass Bag Door 532186002
#7

Engine/housing/handle/bag diagram

Grass bag door

Part #532186002

Replaced by #583708701

?
Manufacturer substitution
This part replaces 532186002. 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 diagram

E-ring

Part #812000058

This item is not returnable
$5.11
In Stock
E-ring 812000014
#6

Engine/housing/handle/bag diagram

E-ring

Part #812000014

This item is not returnable
$6.83
In Stock
Screw.ta 817060410
#29

Wheels/tires/belt diagram

Screw.ta

Part #817060410

This item is not returnable
$6.83
In Stock
Washer 532088348
#31

Wheels/tires/belt diagram

Washer

Part #532088348

Replaced by #532088348

?
Manufacturer substitution
This part replaces 532088348. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock
Bracket, Ups 532125203
#48

Engine/housing/handle/bag diagram

Bracket, ups

Part #532125203

Replaced by #532430034

?
Manufacturer substitution
This part replaces 532125203. Substitute parts can look different from the original.
$10.26
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. …

Read more
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…

Read more
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

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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