1. The oil in the fuel tank of the four-column hydraulic cutting machine is insufficient.

2. Set the pressure too high, adjust the pressure properly;

3. The components of the unloading circuit such as the relief valve, unloading valve and pressure relay are not working properly. Correct the abnormal working condition of each component;

4. The valve has large leakage and short unloading time. Repair the valve with large leakage and consider not using large size valve.

5. Need to install the cooler, the cooler capacity is insufficient, the cooler is faulty, the inlet valve is not working well, the water volume is insufficient, the oil temperature automatic adjustment device is faulty to install the cooler, the cooler is increased, the cooler is repaired, and the valve is repaired. , increase the amount of water, repair the temperature control device;

6. When the high pressure, small flow, low pressure and large flow rate do not overflow from the overflow valve, change the circuit, use the unloading valve, variable pump;

7. The capacity of the accumulator accumulator is insufficient or faulty. Change the accumulator and repair the accumulator;

8. The component setting value of the unloading circuit is not appropriate, the pressure relief time is short, and the pressure relief time is extended.

9. Due to low viscosity or pump failure, the internal leakage of the pump is increased, and the temperature of the pump casing is increased. Oil change, repair, and replacement of the hydraulic pump;

10. Unreasonable structure of the cutting oil tank The structure is improved to make the temperature rise around the fuel tank uniform.