Cummins 3801195 Water Pump Shaft

The Cummins 3801195 water pump shaft is a critical rotating component within the engine cooling system. It transmits mechanical drive from the gear train to the water pump impeller, ensuring continuous coolant circulation through the engine block and radiator. This shaft supersedes part numbers 3025887 and 3026564. Manufactured from high-strength forged alloy steel, the shaft undergoes precision machining and heat treatment to withstand high rotational speeds, torsional loads, and thermal cycling inherent in heavy-duty diesel applications. The bearing journals and seal surfaces are ground to tight tolerances to maintain press-fit integrity and prevent coolant leakage. Designed for Cummins K19, KTA19, QSK19, and K1150 series engines, this shaft serves on-highway heavy trucks, off-highway construction machinery, marine propulsion, and power generation units. It is a non-hazardous, direct OEM replacement requiring no modification during water pump rebuild or assembly replacement.