8TEN Deck Spindle Pulley for Exmark Toro Quest E S Series TimeCutter MX5050 SW5000 ZS5000 SS5000 50-Inch 125-5575

What It Is

This is a replacement deck spindle pulley for 50-inch mower decks on select Exmark and Toro zero-turn mowers. It drives the mower blade via the belt; use it when the original pulley is worn, noisy, or seized.

Fitment & Compatibility

Before buying, confirm your mower has a 50-inch stamped steel deck (not fabricated). This pulley is a direct replacement for OEM part 125-5575. It fits:

• Toro TimeCutter MX5050, SW5000, ZS5000, SS5000 (50" deck models)
• Toro Quest E and S series with 50" deck
• Exmark models using the same 125-5575 spindle pulley (check your parts diagram)

Check two things:

1. Deck width – must be exactly 50 inches. Measure if unsure.
2. Belt routing – this pulley is for the spindle (blade) drive, not the deck drive. Match the pulley diameter and groove width to your old part.

Key Things to Know

• Quality – 8TEN is an aftermarket brand. Expect comparable durability to OEM, but inspect the bearing for smooth rotation before install.
• Installation difficulty – Moderate. Requires removing the deck, unbolting the old spindle assembly, and swapping the pulley. No special tools beyond a socket set and possibly a puller.
• Common gotcha – The pulley may need a spacer or washer if your spindle shaft is slightly different length. Keep your old hardware.
• Noise check – Spin the new pulley by hand. If it feels gritty or stiff, return it; a bad bearing will fail quickly.

Should You Buy It

If your 50-inch Toro or Exmark spindle pulley is worn or damaged, this is a cost-effective replacement—roughly half the price of OEM. It’s right for DIY owners comfortable with basic deck work. For commercial use or if you prefer zero fitment risk, stick with the genuine 125-5575.