This friction disc is the driven plate inside the PTO clutch pack. It transmits torque from the engine to the PTO shaft when the clutch is engaged. The disc sits between the pressure plate and the flywheel face; its friction material provides the grip needed to drive the implement without slipping. Wear on the friction surface reduces clamping force, leading to PTO chatter or failure to engage under load. This component matches the original disc’s thickness and material compound, so the clutch pack’s engagement timing and pedal feel are preserved. On reinstall, ensure the disc is centered in the splined hub and that the pressure plate bolts are torqued to specification.