This metal-rubber bushing fits into the pivot point of the threshing-unit swing arm. It absorbs vibration and allows controlled articulation between the arm and its mounting bracket, reducing metal-to-metal wear at the joint. The rubber layer compresses under load to dampen shock from the threshing rotor, while the metal sleeve maintains the bore diameter for the pivot bolt. A worn bushing introduces play in the swing arm, which leads to misalignment of the threshing components and uneven crop flow. The manufacturer machines the metal sleeve to the same outer diameter as the original assembly, so the bushing seats fully in the housing without shimming. On installation, ensure the pivot bolt passes freely through the inner sleeve and torque the retaining nut to the specified value.