Cummins Water Pump Shaft 6B5.9 Used

This component is a water pump drive shaft designed for Cummins 6B5.9 series diesel engines. Manufactured from hardened and ground alloy steel to withstand rotational stress and coolant exposure. It serves as the central rotating element within the water pump assembly, transferring mechanical energy from the belt drive to the impeller. Dimensional accuracy and surface finish are critical for seal integrity and bearing life. This unit is supplied in used condition, inspected for wear, straightness, and spline integrity. Compatible with water pump assemblies used across industrial, marine, and heavy-duty truck applications utilizing the 5.9L B-series platform. Verified fitment for engine models 6B5.9, 6BT5.9, and B5.9-C series. No manufacturer part number is stamped on the shaft body; identification is by engine application and pump assembly cross-reference.