539112170 Spindle Assembly with 539113300 Pulley Fit for 61 Inch Mower Decks Husqvarna MZ6125 MZD61 EZ6124 FD61M MZ61 MZ 28 ZT BF MZ6125C MZ6128BF MZ61 EZ5224 Zero Turn Mowers 3 Pack

What It Is

This is a 3-pack of spindle assemblies (each with a pre-installed 539113300 pulley) designed to replace the three spindles on 61-inch zero-turn mower decks. It’s for Husqvarna models like the MZ6125, MZD61, EZ6124, FD61M, MZ61, MZ 28, ZT BF, MZ6125C, MZ6128BF, MZ61, and EZ5224, plus compatible Husqvarna/Ferris/Simplicity decks using the same spindle pattern.

Fitment & Compatibility

Before buying, verify your deck is exactly 61 inches (measured blade tip to blade tip) and that your current spindles have a 3-bolt mounting pattern with 3.5-inch bolt spacing. Check that your spindle shaft diameter matches—this assembly uses a 1-inch diameter shaft with a 3/16-inch keyway. Confirm your existing pulley is the same 539113300 part number or equivalent (5-inch OD, 3/4-inch bore). This is an OEM-style replacement, not a genuine Husqvarna part, so cross-reference with your model’s parts diagram (e.g., Husqvarna 539112170). If your deck uses a different pulley or spindle height, it won’t fit.

Key Things to Know

• Quality: Most buyers report these hold up well for residential use, but some note the bearings are less durable than OEM for heavy commercial mowing. Grease fittings are present—keep them lubricated.
• Installation: Moderate difficulty. You’ll need a socket set, a puller to remove the old spindle, and a torque wrench (specs: 35-45 ft-lbs for mounting bolts). The pulley is pre-installed, saving one step.
• Common gotchas: The shaft key may be slightly tight—file it if needed. Ensure the blade adapter (not included) matches your blade’s center hole (typically 5/8-inch). Replacing all three at once prevents uneven wear and vibration.
• Warranty: Typically 90 days; check seller’s policy. No returns if installed.

Should You Buy It

This is a solid budget-friendly option if you’re a homeowner or light-user with a 61-inch Husqvarna zero-turn and want to replace all three spindles at once without paying OEM prices. Skip it for daily commercial use—invest in genuine Husqvarna spindles for longer bearing life under heavy loads.