This bearing shell assembly supports the straw walker shaft within the threshing unit. It consists of two half shells, two plates, and four self-locking nuts, which together maintain the shaft alignment and reduce friction as the walkers oscillate. A worn bearing shell allows excessive shaft play, leading to uneven walker timing and increased stress on the drive components. The assembly matches the original housing geometry, so the shaft sits at the correct height without additional shimming. On installation, tighten the self-locking nuts to the specified torque and verify free shaft rotation before closing the access cover.