This outer bushing for the straw chopper knife assembly serves as the bearing surface between the rotating knife shaft and the stationary housing. It sits at the outer end of the knife rotor, supporting the shaft and maintaining alignment with the chopper drum. Wear in this bushing causes radial play in the knife shaft, which can lead to uneven chopping clearance and increased vibration in the rotor assembly. The bushing is manufactured to match the original shaft diameter and housing bore dimensions, so no additional shimming or reaming is required during installation. When replacing, inspect the housing bore for scoring and clean the contact surfaces before pressing in the new bushing.