Hydraulic Main Control Valve 555-9019 555-9018 491-0908 for E336GC E345GC 320 320GC 323 326 330 349 352 340 Excavator

This hydraulic main control valve assembly is the original core distribution component for the hydraulic system of E336GC, E345GC, 320, 320GC, 323, 326, 330, 349, 352, and 340 excavators. It regulates 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