K7V280 CAT E395 E395GC Excavator Main Hydraulic Piston Pump for 584-0380 627-1304 Procurement Guidelines Verify OEM part number to confirm the main hydraulic piston pump assembly fits, including the pump body, regulator, and servo valve components. New or remanufactured pumps must provide a hydraulic bench test report covering pressure, flow, case drain, and internal leakage. For remanufactured pumps, confirm new replacement of pistons, cylinder block, valve plate, slippers,