1314202039 Pump Shaft, compatible with ZF 12-speed and 16-speed gearboxes. Treated with quenching, tempering and precision grinding, it has high surface hardness, great wear resistance and accurate coaxiality. It runs with small swing to ensure stable transmission and reduce abnormal noise and component loss. It has excellent bending and fatigue resistance to bear long-term torque load. Fully compliant with original size parameters for high assembly compatibility, it ensures consistent power output of the pump and suits all kinds of heavy-duty commercial vehicles.