This water pump circulates coolant through the engine block and radiator to maintain operating temperature in the parent combine. It is driven by the engine's accessory belt and mounts directly to the timing-gear housing. The pump includes a gasket for the mounting face. A failing pump typically shows coolant seepage from the weep hole or bearing noise that increases with engine speed. The manufacturer machines the impeller and shaft to match the original assembly's clearance, so no shimming or adapter is required during replacement. On installation, clean the mating surface and torque the mounting bolts to specification.