This bearing shell assembly supports the walker shaft in the threshing unit of the parent combine. It consists of two bearing shell halves, two mounting plates, and the associated fasteners. The assembly sits between the shaft journal and the housing, allowing the walker mechanism to oscillate freely. Wear in the bearing shell increases clearance, which leads to shaft misalignment and accelerated wear on the adjacent seals and drive components. The set includes self-locking nuts that should be replaced on reinstallation; torque the housing bolts to specification.