539112170 Spindle Assembly with 539113300 Pulley for Husqvarna 61" Deck Fits MZ61 MZ6125 MZD61 FD61M EZ6124 61 Zero-Turn Mowers (3 Pack)

What It Is

This is a 3-pack of replacement spindle assemblies (part 539112170) with pre-installed pulleys (part 539113300) designed for Husqvarna 61-inch cutting decks on zero-turn mowers. It’s the rotating hub that drives the blade; when bearings wear out or the pulley gets damaged, this assembly lets you swap the whole unit at once.

Fitment & Compatibility

Before buying, confirm your mower has a 61-inch fabricated deck (not a stamped 54” or 60”). This 3-pack fits Husqvarna models MZ61, MZ6125, MZD61, FD61M, and EZ6124. Also compatible with some AYP/Electrolux-built 61” decks on Craftsman or Poulan Pro zero-turns—check your deck’s spindle bolt pattern (typically 3-bolt, 4.5” center-to-center). Measure your existing spindle housing height (approx. 4.75” from mounting surface to pulley top) to match. This is an OEM Husqvarna part, not aftermarket, so it should bolt directly onto factory decks without modification.

Key Things to Know

• Bearings are sealed and pre-greased – no maintenance needed, but if you hear grinding or wobble after a season, replace the whole assembly (bearings are not serviceable).
• Installation is moderate difficulty – you’ll need a jack or blocks to lift the mower, a socket set (usually 9/16” or 5/8”), and a torque wrench (tighten spindle bolts to 40–50 ft-lbs). Mark blade rotation direction before removing old spindles.
• Pulley is already pressed on – saves time, but double-check the pulley keyway aligns with the spindle shaft before tightening the center bolt.
• Common gotcha: The 3-pack is often cheaper per spindle than buying singles, but verify your deck uses three identical spindles (some 61” decks have a center spindle with a shorter shaft – this set is all the same height).

Should You Buy It

Buy this if you have a Husqvarna 61” zero-turn with one or more bad spindles (vibration, uneven cut, or metal-on-metal noise). The 3-pack is cost-effective if you’re replacing all three at once, but if only one is failing, you can buy a single unit instead. It’s a solid OEM choice for DIY repairs—just expect a couple hours of work if you’re swapping the full set.