Hitachi EX120-1 Main Control Valve (Distribution Valve) | 4330216 4366958 Guangzhou Xinjiafeng Parts

Main control valve (distribution valve) for Hitachi EX120-1 excavators. This multi-way hydraulic valve controls the boom, arm, bucket, swing, and travel circuits while regulating the hydraulic pressure and flow required for simultaneous (combined) operations.

OEM Part Numbers: 4330216 / 4366958

We offer brand-new assemblies, reconditioned/refurbished control valves, and a wide range of spare parts including spools, seal kits, relief valves, and shuttle valves.

Each reconditioned unit undergoes complete disassembly and ultrasonic cleaning. Valve body bores are inspected; worn spools, seals, and relief valve components are replaced; and pressure settings are calibrated to original OEM specifications.

• Bench-tested prior to shipment, including checks for internal leakage, relief pressure, and performance during combined operations.
• Test reports and videos available upon request.
• Direct 1:1 replacement with identical port configurations — no modifications required for installation (please verify part number).
• Comprehensive overhaul services, valve repairs, pressure calibration, and technical support are also available.
• Spools and seal kits are available in stock.

We also stock hydraulic main pumps, swing motors, travel motors, and control valves specifically for Hitachi excavators.

1. Release hydraulic system pressure: Turn off engine and pull all operating levers several times to release residual pressure. Disconnect power supply for safety.
2. Remove distribution valve: Gradually remove hydraulic lines and mark them to avoid wrong connections. Remove fixing bolts and carefully extract the distribution valve.
3. Check installation location: Clean the installation area to prevent impurities from entering the hydraulic system. Check pipes and joints for damage or leaks.
4. Install new distribution valve: Connect hydraulic pipes according to original configuration. Replace sealing rings to ensure proper sealing. Tighten fixing bolts securely.
5. Fill hydraulic oil: Check hydraulic oil level and add if necessary. Start engine and run at idle speed while checking for leaks.