This metal-rubber bushing fits into the sieve rocker arm assembly of the cleaning unit. It acts as a pivot point and vibration damper between the rocker arm and its mounting bracket. The rubber layer absorbs shock loads from the oscillating sieve motion, while the metal inner and outer sleeves maintain the correct bore alignment. Wear in this bushing causes excessive play in the rocker arm, leading to uneven sieve movement and reduced cleaning efficiency. On installation, ensure the bushing is fully seated in the bore and that the rocker arm moves freely without binding.