Product Overview A8VO107 main hydraulic piston pump assembly designed for CAT E320B, E323B, E320A, and E320L excavators. This complete pump unit is a direct replacement for OEM part numbers 134-1063, 126-2073, and 123-2233, covering 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