8TEN Idler Pulley for John Deere Ztrak Z355E Z245 X310 Z425 X324 X330 X350 Z435 Z445 AM135526

What It Is

This is a replacement idler pulley for the mower deck belt system on select John Deere Ztrak zero-turn and X-series lawn tractors. It guides and tensions the deck belt to keep the blades engaged and spinning properly.

Fitment & Compatibility

• Direct OEM replacement for John Deere part number AM135526.
• Confirmed fit on Ztrak models: Z355E, Z245, Z435, Z445. X-series: X310, X324, X330, X350, X425.
• Deck size matters – this pulley is used on 48-inch and 54-inch decks primarily. Check your deck size before ordering.
• Measure before buying – outer diameter should be 4.0 inches, inner bearing bore is 5/8 inch. Confirm your existing pulley matches these specs.
• Aftermarket part – not genuine John Deere, but designed to meet OEM specs.

Key Things to Know

• Bearing quality – some users report the bearing is sealed and runs smooth out of the box, but a few note it may wear faster than OEM under heavy use.
• Installation difficulty – very easy. Requires a socket or wrench to remove the center bolt, swap pulleys, and retighten. No special tools needed.
• Common gotcha – the belt routing must be correct after replacement. Take a photo before removing the old pulley to avoid confusion.
• Package contents – includes the pulley only. You may need to reuse your original bolt or buy one separately if lost.

Should You Buy It

If you need a quick, budget-friendly fix for a worn or noisy idler pulley on a compatible John Deere Ztrak or X-series mower, this is a solid pick. It’s not premium grade, but it works fine for residential use and occasional commercial light duty. For heavy daily commercial mowing, consider the genuine John Deere pulley for longer life.