This bearing shell assembly supports the straw walker crankshaft within the threshing unit of a combine harvester. It consists of two bearing shell halves, two retaining plates, and the necessary fasteners to secure the assembly to the machine frame. The bearing shells provide a replaceable wear surface between the rotating crankshaft journal and the stationary housing, maintaining proper alignment of the walker mechanism. As the shells wear, clearance increases, leading to vibration and uneven walker motion that reduces separation efficiency. The self-locking nuts included in the set should be replaced during installation, and the retaining bolts must be torqued to the specification for the host machine.