Main Control Valve Multi-way Distributor for EC250D EC300D EC350D Excavator Installation & Verification Guidelines Verify VOE part number and confirm main control valve assembly compatibility, including boom, arm, bucket, travel, swing spools, relief valves, and holding valves. New or remanufactured valves must include hydraulic bench test reports for pressure, flow, and internal leakage of each section. For remanufactured valves, confirm spools are honed, repaired, or new.