Three common four-column hydraulic press faults and troubleshooting
1. The lifting plate does not rise during work or the pressure drops significantly when the pressure is maintained
Dirt in the high-pressure pump or damaged oil seal Clean or replace
Dirt, wear, or damaged oil seals in the control valve
Grind or replace
The oil pump is reversed Reconnect the motor wire
The safety valve is not adjusted properly Adjust the safety valve
Insufficient oil in the tank Add enough oil
2. Unstable pressure or crawling phenomenon The oil is dirty or the pump and valve are dirty Change the oil or remove it
Air in the oil or pipe Empty line several times
Damaged oil seal in high pressure pump or control valve Replace
Insufficient oil causes the oil pump to suck up. Add enough oil
Oil leakage Oil seal is damaged, the screw plug is not tightened Tighten the screw plug
3. Action error The machine action sequence function is shown in the valve action sequence table.
Find out the corresponding function block on the sequence table for each action error and repair it.
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