The John Deere AXE21212RT is a genuine OEM belt tensioner designed for optimal performance and durability in a wide range of John Deere agricultural machinery. This essential component ensures proper belt tension, reducing wear and tear on belts and associated drive components. It is compatible with John Deere S760, S770, S780, S785, S790 Combines; 8100, 8200, 8300, 8400, 8500, 8600, 8700, 8800, 9500, 9600, 9700, 9800, 9900 Forage Harvesters; CP690, CS690 Cotton Pickers; R4030, R4038, R4044, R4045, R4060 Sprayers; and 9470R, 9520R, 9570R, 9620R, 9470RX, 9520RX, 9570RX, 9620RX Tractors. Weighing approximately 0.82 kg with package dimensions of 130 mm length, 130 mm width, and 130 mm height, this tensioner is built to John Deere's exacting standards.