Reasons for excessive downward pressure on 1.
1、800 ton hydraulic pressExcessive support pressure;
2. The sealing ring of the hydraulic cylinder leaks oil;
3. The preset pressure of the pilot valve is too small;
4. Poor sealing of cartridge valve port;
5. There is air in the oil circuit of the pressure gauge;
6. Mechanical vibration of pipeline;
7. The pressure gauge is damaged;
8, pressure compensation variable pump flow is too small;
9. The hydraulic pump is worn or burnt out;
10, 800 tons of hydraulic press system oil leakage.
2. downward pressure is too large solution
1. Adjust the pilot valve so that its pressure is not greater than 1MPa;
2. Check the sealing ring, if it is damaged, please replace it;
3. Adjustmentfour-column hydraulic presspressure value;
4. Check whether the valve port is reground;
5. When pressing up, loosen the joint to release air;
6. Check whether the pipeline is loose or tight;
7. Replace the pressure gauge of the four-column hydraulic press;
8. Adjust according to the requirements of the oil pump;
9. When the oil output of the oil pump drain port is greater than 4L/min, it should be removed for maintenance;
10. Check the links corresponding to each part.