This rubber cover sits on the underside of the threshing mechanism, protecting the straw walkers and the area around the grain pan from wear caused by crop flow and debris. It acts as a sacrificial barrier between the moving threshing components and the machine frame. A torn or missing cover allows crop material to accumulate on the mechanism housing, which can lead to uneven threshing and increased cleaning load. The cover is formed to match the contour of the threshing-unit floor and is fastened along its edges. On reinstall, ensure the cover lies flat and that all fastening points are secure to prevent flapping during operation.