Cummins 4983588 Lubricating Oil Pump Assembly

The Cummins 4983588 is a gear-type lubricating oil pump designed for C-series 8.3L and 8.9L diesel engines including ISC, ISL, QSC, and QSL models. It draws oil from the sump and pressurizes it through the engine oil passages to lubricate bearings, pistons, and valve train components. The pump features an aluminum housing with cast iron gears for durability under high-pressure operating conditions. It is driven by the engine gear train. This part supersedes previous part numbers 3991123, 4941464, 3950005, and 3966840. It serves as a direct replacement for Hyundai Construction Equipment excavators HX330L, HX380L, HX430L, and R250D-9, as well as Komatsu PC300-8 applications utilizing the Cummins 6L engine platform.