Troubleshooting of Pressure Abnormalities in Hydraulic Systems

The pressure in the hydraulic system is abnormal and the pressure cannot go up or down. Pressure is one of the two most basic parameters of the hydraulic system, which to a large extent determines the performance of the hydraulic system. This fault manifests itself as follows: when adjusting the pressure of the hydraulic system, the adjustment failure occurs, the system pressure cannot be established, the pressure is insufficient, or there is no pressure, or it rises and then falls, the adjusted pressure is unstable, and the pressure fluctuates greatly.

1. What are the effects of hydraulic system failure?

① The actuator (such as hydraulic cylinder, hydraulic motor) does not move, or although it moves, it stops moving when it is loaded with load, or it is weak and cannot overcome the load and perform work.

② The hydraulic system cannot achieve the correct working cycle, especially in the pressure-controlled sequential action circuit

③ Some valves that rely on pressure control cannot work, such as hydraulic reversing valves, hydraulic control check valves, cartridge valves, pressure relays, etc., which also causes the hydraulic system to not work properly.

④ The speed of the actuator decreases due to insufficient load flow.

⑤ Malfunctions including safety accidents due to out-of-control pressure regulation

2. How to troubleshoot pressure abnormalities in the hydraulic system

① You can try to change the wiring of the motor, correct the rotation direction of the hydraulic pump, and replace the appropriate motor.

②Change the inlet and outlet direction of the hydraulic pump.

③Appropriately change the size of the pump suction pipe, tighten the seal at the joint of the suction pipe, clean the oil filter, etc.

④ Troubleshoot the directional valve. If an unloading valve is installed, troubleshoot the unloading valve.

⑤ Identify the specific locations of internal and external leaks, and eliminate internal and external leakage faults