UDC Parts AM121602 Idler Pulley / 48 inch Deck/Replacement for John Deere AM106627 AUC16698 LT133 LT160 F725 X320 GT235 LT155 GT225 Scotts Z445 Z425

What It Is

The UDC Parts AM121602 idler pulley is a replacement tensioner pulley for 48-inch mower decks used on a wide range of John Deere and Scotts lawn tractors. It routes and tensions the deck drive belt, keeping the blades engaged properly.

Fitment & Compatibility

Before buying, confirm your deck is 48 inches and that your mower model is listed. This pulley replaces OEM John Deere part numbers AM106627 and AUC16698. Fits models including: John Deere LT133, LT160, LT155, LT225, GT235, GT225, F725, X320, Z445, Z425, and Scotts Z445, Z425, and others with a 48-inch deck. The pulley has a 3/8-inch bore, a 4-inch outside diameter, and uses a 6202 bearing. Measure your old pulley’s bore and diameter to verify match—especially if your deck is not a standard 48-inch or if you have a different OEM pulley number.

Key Things to Know

• Quality: UDC Parts is an aftermarket brand; reviews are very strong (4.8/5 from 767 ratings), suggesting good durability and fit.
• Installation: Easy to moderate—remove the belt, unbolt the old pulley (usually a single bolt or nut), install the new one, and re-tension the belt. No special tools needed.
• Common gotcha: The pulley uses a 6202 bearing, which is sealed and pre-lubed. If your old pulley has a different bearing type or a worn shaft, check for shaft damage before installing.
• Belt compatibility: Works with standard 48-inch deck belts; if you’re replacing the belt too, ensure the belt length matches your deck (usually around 96–100 inches for these models).

Should You Buy It

If you own a compatible John Deere or Scotts with a 48-inch deck and need a reliable, affordable idler pulley, this is a solid choice. The high rating and low price make it a no-brainer for a straightforward DIY fix—just double-check your bore and diameter before ordering.