Product Introduction This hydraulic main control valve assembly is the core distribution component of the excavator hydraulic system, compatible with the E320C, E320D, E330D, and E336D models. It controls the flow and pressure of hydraulic oil for the boom, arm, bucket, and travel functions. Manufactured to strict standards, it delivers stable performance and reliable sealing, making it well suited for equipment repair and replacement. Interchange Part Number: 255-5661 Common