What are the common gantry crane hydraulic system failure (a)

What are the common   overhead gantry crane  hydraulic system failure


The first is the actuator action weakness. Hydraulic motor or hydraulic cylinder action inability reasons two: First, because the system pressure limiting valve (safety valve) tuning pressure is low, or if the valve is working poor or damaged; Second, because the system leaks (including hydraulic pumps, motors, hydraulic cylinders, valves and external piping system leaks) result in partial or full system pressure is insufficient. A Taiwan KH180-3 crawler crane lifting a bridge during work, sudden weakness of the arm with load newcomer fault. The inspection found that rotary valve (the valve is operating room by a direct operation of the operating lever, without pilot control system) more serious oil spill. Rotary aircraft hydraulic systems rely on the same system with a hydraulic luffing oil, turning serious leak valve rotation operation although no major impact, but causes connected with this oil boom system significantly reduced the pressure within the In this pressure, the no-load state arm still capable of maintaining the ups and downs, but when the arm load is heavy, can not be maintained from the arm. This rotary valve disintegration of inspection, found that some serious aging seals, O-rings in which a small part of the remaining remnants, resulting in a large number of hydraulic fluid leakage. Replaced with a new seal, the   bridge gantry crane  weak arm trouble since been completely ruled out.