Excavators CAT E120B E110B E130B Hydraulic Main Piston Pump Assembly VRD63 Product Overview The E120B hydraulic pump is specifically designed for the CAT E120B excavator and serves as the core power component of the machine's hydraulic system. Purchasing and Installation Guidelines Verify OEM part number compatibility, including regulator and servo valve assembly Require hydraulic bench test report for pressure, flow, and case drain leakage For remanufactured units, confirm