John Deere OEM V Idler Pulley L 100 120 130 LT 133 155 166 GT 225 235 242 262 275 325 335 345 355 AM118447

What It Is

This is a genuine John Deere V idler pulley (part #AM118447) that guides and tensions the drive belt on select lawn tractors and garden tractors. It’s used on the mower deck and transmission systems to keep belts aligned and running smoothly.

Fitment & Compatibility

Before buying, confirm your model and deck size. This pulley fits John Deere L100, L120, L130, LT133, LT155, LT166, GT225, GT235, GT242, GT262, GT275, GT325, GT335, GT345, and GT355. It also fits 42-inch, 48-inch, and 54-inch decks on these models. Measure the pulley diameter (approx. 4 inches) and the bearing bore (0.5 inch) to verify. This OEM part replaces the original; aftermarket versions exist but may vary in bearing quality. Check your belt routing diagram to ensure it’s the correct idler (some decks use two different pulleys).

Key Things to Know

• Quality: Genuine John Deere – sealed bearing, robust steel, holds up longer than cheap alternatives.
• Installation: Easy – remove belt, unbolt old pulley (likely a 5/16” bolt), bolt on new one, re-route belt. No special tools needed.
• Common gotcha: The pulley can seize if the bearing fails, so replace if it wobbles or makes noise. Use a thread locker on the bolt to prevent loosening.
• Compatibility tip: Some aftermarket pulleys use a different bearing depth – this OEM part matches factory clearance exactly, so no belt alignment issues.

Should You Buy It

If you own one of the listed John Deere tractors and need a direct, hassle-free replacement for a worn or noisy idler pulley, this is the right choice. It’s a bit pricier than generic options but guarantees fit, durability, and no belt tracking problems. Perfect for DIY owners who want one-and-done reliability.