Product Overview A11VO130 / A4VG56 hydraulic main piston pump assembly for CAT M318 excavators. Compatible with OEM part numbers 0R-8674 , 111-3727 , and 139-9530 . This assembly includes the pump body, regulator, and servo valve components. 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