The John Deere AM121970 is a genuine OEM tensioner pulley designed for a wide range of John Deere lawn tractors, zero-turn mowers, and utility vehicles. This crucial component maintains proper belt tension, preventing slippage and ensuring efficient power transfer to various systems. Constructed from durable materials, it offers reliable performance and extended service life. With an outer diameter of 101.6 mm, an inner diameter of 17.0 mm, and a width of 25.4 mm, this pulley ensures precise fitment and optimal operation in compatible John Deere machinery.