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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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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 125 parts  |
Lawn Mower Drive Pinion Torsion Spring (replaces 188291) 532188291
#36

Wheels/tires/belt/drive cover diagram

Lawn mower drive pinion torsion spring (replaces 188291)

Part #532188291

BEST SELLER
This item is not returnable
$5.31 | 
16% OFF Phone Price : $6.31
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
Idler Pulley 532166043
#27

Wheels/tires/belt/drive cover diagram

Idler pulley

Part #532166043

$37.31
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
Screw.ta 817060410
#29

Wheels/tires/belt/drive cover diagram

Screw.ta

Part #817060410

This item is not returnable
$6.83
In Stock
Pawl.drive.21.ez-walk 532175098
#37

Wheels/tires/belt/drive cover diagram

Pawl.drive.21.ez-walk

Part #532175098

$8.54
In Stock
Bracket, Ups 532125203
#48

Engine/housing/bag/handle/chute diagram

Bracket, ups

Part #532125203

Replaced by #532430034

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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 vibrate a lot?

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

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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 run rough?

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

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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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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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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 rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

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Repair difficulty
Time required
 15 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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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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Types of walk-behind mower blades video

Types of walk-behind mower blades video

Learn about the different kinds of mower blades and how to maintain them.…

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