This wedge is a drive component for the threshing mechanism. It transmits force between the drive pulley and the driven hub, locking the assembly to prevent slippage under load. A worn or missing wedge allows the drive to slip, which reduces threshing drum speed and causes uneven crop processing. The wedge is machined to match the keyway dimensions of the original assembly, ensuring a tight interference fit without the need for shimming. On reinstallation, confirm the wedge is fully seated in the keyway before tightening the retaining hardware.