Sometimes the pressure of a four-column hydraulic press fails to rise due to several reasons:

1. Common operational errors: such as incorrect three-phase power connection, insufficient oil in the tank, or failure to adjust the pressure regulating valve. These issues typically occur when beginners first use the press.

2. Insufficient power: commonly seen in older machines due to pump wear, motor aging. You can test the pump's condition by feeling the suction force while the machine is in operation. If the suction force is strong, the pump is likely fine; otherwise, it may need attention. Motor aging, although rare, can be identified by loud noises and a decreased ability to generate power.

3. Oil leakage: Check for visible signs of leakage on the machine's surface. If there are none, it might indicate damage to the piston's oil seal.

4. Faulty hydraulic valve: If the valve is blocked or its internal spring is obstructed by impurities preventing proper resetting, it can cause the pressure not to rise. If it's a manual directional valve, try disassembling and cleaning it.

5. Malfunctioning hydraulic gauge: If the hydraulic gauge is faulty, it needs to be replaced.

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