This rubber cover shields the threshing mechanism from crop residue and debris ingress during operation. It mounts along the threshing assembly, protecting the rotating components from wrapping and wear caused by straw and chaff accumulation. A torn or missing cover allows material to pack around the drum and concave, leading to uneven threshing and increased drive load. The cover is formed to match the original profile so it seats against the adjacent sheet metal without gaps. On replacement, ensure the mounting holes align and the fasteners are tightened to prevent vibration loosening.