Spindle Assembly 21549012 / 587820301 for Husqvarna Ariens Dixon

Overview

This aftermarket 21549012 / 587820301 spindle assembly is a replacement-style mower deck spindle assembly for select Husqvarna, Ariens, Dixon, Poulan, and related AYP-built mower deck applications.

This listing is organized around the 21549012 / 587820301 spindle path. Some package options may include additional deck repair components such as pulley, idler, or blade references, but the lead replacement path is the spindle assembly.

Key Features

• Aftermarket replacement-style mower deck spindle assembly
• Product Type: Spindle Assembly
• Lead Part Numbers: 21549012, 587820301
• Also Replaces: 21546238, 21546299, 532187292, 532187281, 532192870, 539112057, 587125401, 587253301, 587819701, 192870, 587256501, 587256401, 705048, 187281, 532187290
• Common Deck References: 42 inch, 46 inch, and 54 inch deck paths appear across this spindle family
• Optional package variants may include spindle assemblies, pulley / idler components, or mower blades
• Organized by spindle or mandrel part number first to reduce fitment confusion

Compatible Brands & Model Series

This 21549012 / 587820301 spindle assembly is used on select Husqvarna, Ariens, Dixon, Poulan, and related AYP-built mower deck applications.

Common application paths include:

• Husqvarna and AYP-style riding mower and lawn tractor deck applications using the listed spindle path
• Ariens and Dixon deck applications using the 21549012 / 21546238 / 21546299 spindle reference path
• Poulan and related AYP-built mower decks using the 587820301 / 532187292 spindle family
• 42-inch, 46-inch, and 54-inch deck package paths where the original spindle or mandrel number matches one of the listed replacements

Verify your part numbers before ordering.

Replaces OEM Part Numbers

• Ariens / Dixon: 21549012, 21546238, 21546299
• Husqvarna / Poulan / AYP: 587820301, 532187292, 532187281, 532192870, 539112057, 587125401, 587253301, 587819701, 192870, 587256501, 587256401, 705048, 187281, 532187290

Related Spindle Shaft Reference

• Spindle Shaft / Shaft-with-Bearing Reference: 532192872

Optional Package Part Number Breakdown

Part numbers below may apply to available package options. Not every package includes every component listed. Select the option that matches the parts needed for your repair.

• Spindle / Mandrel Numbers: 21549012, 21546238, 21546299, 587820301, 532187292, 532187281, 532192870, 539112057, 587125401, 587253301, 587819701, 192870, 587256501, 587256401, 705048, 187281, 532187290
• Spindle Shaft Reference: 532192872
• Pulley / Idler Numbers: 21546127, 539110318, 532129861, 129861, 532153535, 153535, 532173436, 173436, 177865
• Blade Numbers: 21546848, 532187255, 187255, 24541, 575938501, 582923101

Single Spindle Specifications

• Spindle Part Number: 21549012
• Also Replaces: 587820301, 532187292, 532187281, 532192870, 539112057, 587125401, 587253301, 587819701, 192870, 587256501, 587256401, 705048, 187281, 532187290
• Spindle Style: Husqvarna / AYP-style mower deck spindle or mandrel assembly
• Application Note: Confirm housing style, pulley setup, blade center, and mounting pattern before ordering

Optional Package Component Specifications

The following specifications apply to optional package variants that include pulley / idler components or blades.

• Pulley / Idler Numbers: 21546127, 539110318, 532129861, 532153535, 532173436
• Blade Numbers: 21546848, 532187255, 187255, 24541, 575938501, 582923101
• Blade Length Reference: 18-7/16 inches
• Blade Width Reference: 2-1/2 inches
• Blade Thickness Reference: 0.187 inch
• Blade Center Hole: 5-point star

Common Symptoms / When to Replace

• Mower deck spindle is noisy, loose, seized, or wobbling
• Blade has excessive play at the spindle shaft
• Deck vibration increases during blade engagement
• Pulley, idler, or blade system is worn, damaged, or no longer tracking correctly
• Original spindle number matches one of the listed Ariens, Dixon, Husqvarna, Poulan, or AYP replacement numbers

Quick Ship Fulfillment

This item may ship directly from one of our trusted U.S. distribution partners to help reduce transit time. Packaging, labeling, or warehouse origin may vary, but the part will match the replacement numbers, fitment notes, and specifications shown in this listing.

Why Buy From PTO Direct USA

• Fitment-first product organization by replacement part-number path
• Clear spindle, shaft, pulley, idler, and blade references for package variants
• U.S.-focused fulfillment options for faster delivery when available

Need a Custom Package?

Need a different combination of parts? Email us the part type and part numbers you need, such as spindle assemblies, blades, belts, pulleys, reinforcement rings, bearings, or hardware. We can review the part-number path and quote a custom package when available.

FAQ

Is this an OEM spindle assembly?

No. This is an aftermarket replacement-style spindle assembly intended to replace the listed Ariens, Dixon, Husqvarna, Poulan, and AYP part-number path when the physical fitment details match.

What are the lead part numbers for this listing?

The lead spindle numbers are 21549012 and 587820301. This listing also references related Ariens, Dixon, Husqvarna, Poulan, and AYP replacement numbers in the same spindle path.

Are 21546127, 532129861, 532153535, and 532173436 spindle numbers?

No. Those are pulley / idler numbers and should not be listed as spindle assembly replacement numbers.

Are 21546848 and 532187255 spindle numbers?

No. Those are mower blade numbers used in some package paths.

Can I order by deck size only?

No. Deck size alone is not enough. Match the original spindle or mandrel number and confirm your mower model, deck setup, pulley layout, mounting pattern, blade center style, and blade path before ordering.