Hydraulic Main Control Valve 255-5661 for E320C E320D E330D E336D Excavator

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.

• Slow movement of the boom, arm, or bucket
• Unstable action or jitter during operation
• Oil leakage from valve joints and sealing surfaces
• High hydraulic system pressure with frequent relief
• Single action unresponsive or weak in power

• Confirm the machine model before ordering
• Check the part number to match your old valve
• Test before installation, and replace sealing kits together if needed
• Keep the work area clean during installation to prevent dirt from entering the hydraulic circuit