This washer functions as a spacer or shim in the cab, threshing mechanism, and hydraulic system of the host machine. It sits between fastened components to maintain correct clearance and prevent metal-to-metal contact under clamping load. A missing or incorrect washer in these locations can lead to loosening of the assembly, fluid leaks at hydraulic connections, or premature wear of the threshing components. The original manufacturer's dimensions match the housing's bore and seat geometry, so the washer sits flat without deformation during torque application. On reinstallation, verify the washer is not deformed or cracked before reuse.