Use For Hitachi ZX30U-5A ZX35U-5A Excavator Main Control Valve High Quality Main Control Valve Construction Machinery Aftermarket Parts 4722750 KYB C0070-23057

Regulates hydraulic oil flow, direction, and pressure to control dozer blade movement, track travel, and compound operations, serving as the hydraulic system’s core controller.

• System Pressure: The main relief valve setting pressure is 34.3 MPa (350 kg/cm²), suitable for the high-pressure hydraulic system of the entire machine, ensuring sufficient power output for digging, swing, traveling and other key operations.
• Structure Type: Adopts a slide valve type multi-section main control valve, integrating multiple hydraulic control branches such as digging circuit, swing circuit and traveling circuit, supporting synchronous adjustment of compound actions (e.g., simultaneous arm lifting and bucket tilting).
• Control Method: Equipped with pilot control system. Precise hydraulic control of boom lifting/lowering, arm extension/retraction, and machine swing/traveling is realized through the pilot joystick, with fast and sensitive operation response.
• Applicable Models: Custom-made for ZX30U-5A ZX35U-5A excavators, fully matching the hydraulic parameters of its dedicated hydraulic pump, actuators (cylinders, swing motors, travel motors).

• Hydraulic System "Brain": Receives operator commands, controls flow direction, pressure and volume
• Boom lift/lower, arm extension/retraction, bucket rotation
• Swing, left/right travel, dozer blade operation
• Complex Motion Coordination: Manages multiple actuators simultaneously for smooth operation

• Installation Requirements: Requires a flexible coupling with high shaft alignment accuracy (concentricity deviation ≤ 0.1 mm, tilt angle < 1°)
• Maintenance Guidelines: 
  • System overpressure protection
  • Single-operation overload protection
  • Prevents dangerous misoperations

Guangzhou Tieqi Engineering Machinery Co., Ltd. ("IRON CAVALRY")

Location & Overview: Strategically located in Guangzhou's Huangpu District, approximately an hour from Baiyun International Airport, Tieqi has been a dedicated specialist in engineering machinery hydraulics for nearly 15 years.

Our Core Values

Driven by our core values of "Pragmatism and Progress," we are committed to delivering practical solutions and upholding our responsibilities. This principle-driven approach defines all our operations and client partnerships.

Technical Leadership & Standards

In China's excavator hydraulic assembly sector, our efficient execution and rigorous approach to manufacturing every product to meet over 95% of original performance specifications have built widespread trust.

For large items, we use sturdy plywood crates secured with metal fasteners for added stability. Inside, the products are cushioned with bubble wrap and secured with wooden braces, while special attention is given to protecting vulnerable parts. Externally, the crates are reinforced with high-strength PET plastic strapping and wrapped in highly waterproof black film.