Procurement Guidelines Verify OEM part number to confirm the main hydraulic piston pump assembly fits , including 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, retainer plate, bearings, and all seals. Inspect pump housing for cracks and sand