This rear straw-walker shaft transmits rotational motion from the drive mechanism to the walker assembly, agitating the crop mat to separate grain from straw. It spans the width of the walker section and engages with the bearing supports at each end. Wear on the shaft journals or splines causes uneven walker motion, reducing separation efficiency and increasing grain loss. This component is manufactured to match the original shaft’s journal diameter and spline profile, so it seats correctly in the existing bearings without requiring shimming. On installation, inspect the bearings and seals for wear, and replace them if necessary to prevent premature shaft damage.