1. The oil-cut  port of high low  pump is not locked; Use a spanner to lock it tightly

2. Oil in oil tank insufficient; Supplement well the oil

3. Oil pipes in oil cylinder broken; Fix the broken pipe or replace it

1. The switch has oil leakage; replace the oil seal

2. The relief valve is stuck; can remove and clear it

3. The valve of pre-fill valve damaged; replace it

4. The anti-reverse valve for pressurization cannot maintain pressure; replace it

Air switch tripping due to overloading; Check for shorts or overuse (50A), just replace it

It's because one wire of 3 wires three-phase is broken or off. We can change the new wire and connect.

You could take the following steps to check and solve the problem.

1. Check whether the power is off, then switch the power on

2. Motor rotation direction wrong; Change to connect any 2 of 3 pcs of power wires

3. Hydraulic oil insufficient; Filling enough oil

4.Thermal replay tripping over motor load; Switch on the blue reset button of thermal relay