Husqvarna
Gas Walk-Behind Mower

Model #55R21HVD Husqvarna lawn mower

Here are the repair parts and diagrams for your Husqvarna 55R21HVD lawn mower. 

The diagram(s) below can help you find the right part.  If you’d like help, we invite you to call our customer service number at the top of the page, or click chat.

On this page, you can also find any manuals, installation guides and error code tables associated with this model.

For advice on diagnosing problems with appliances, lawn & garden equipment and other products, check out the videos, repair guides and articles in our DIY section.

Showing 10 of 124 parts

Lawn Mower Bolt

#9

Engine/housing/handle/bag Diagram

Lawn mower bolt

Part #872140405
This item is not returnable

$4.35

In Stock

Lawn Mower Output Shaft Seal

#7

Gearcase Diagram

Lawn mower output shaft seal

Part #532183508
This item is not returnable

$4.35

In Stock

Lawn & Garden Equipment Washer

#8

Gearcase Diagram

Lawn & garden equipment washer

Part #532183509
This item is not returnable

$2.55

In Stock

Lawn Mower Worm Shaft Seal

#12

Gearcase Diagram

Lawn mower worm shaft seal

Part #532183514
This item is not returnable

$4.64

In Stock

Lawn & Garden Equipment Bushing

#9

Gearcase Diagram

Lawn & garden equipment bushing

Part #532183511
This item is not returnable

$3.26

In Stock

Formed Wire

#5

Gearcase Diagram

Formed wire

Part #532183505
This item is not returnable

$2.57

In Stock

Lawn Mower Drive Pinion Torsion Spring

#36

Wheels/tires/belt/drive cover Diagram

Lawn mower drive pinion torsion spring

Part #532188291
This item is not returnable

$3.26

In Stock

Lawn & Garden Equipment Bearing

#6

Gearcase Diagram

Lawn & garden equipment bearing

Part #532183506
This item is not returnable

$6.37

In Stock

Lawn Mower Axle Bushing, Front

#47

Wheels/tires/belt/drive cover Diagram

Lawn mower axle bushing, front

Part #532183438
This item is not returnable

$4.79

In Stock

Worm Shaft

#4

Gearcase Diagram

Worm shaft

Part #532191246

$24.99

In Stock

Symptoms for gas walk-behind mowers

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

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel
Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade
Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent
Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up
Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key
Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, bad ignition coil

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.

March 1, 2016
By Lyle Weischwill
How to replace a lawn mower drive cable

The drive cable engages the transmission to spin the drive wheels and move the mower across the grass. Replace the drive cable if it's broken or frozen up inside the sheath.

Repair difficulty
Time required
 60 minutes or less
April 1, 2013
By Lyle Weischwill
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.

Repair difficulty
Time required
 15 minutes or less
April 1, 2013
By Lyle Weischwill
How to replace a lawn mower safety switch

The safety switch stops the engine when you release the lever on the handle. This repair guide explains how to replace it if it's not working correctly.

Repair difficulty
Time required
 30 minutes or less

Articles and videos common to all walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

October 1, 2019

Types of walk-behind mower blades video

By Sears PartsDirect staff

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