- 1. The spring of the hydraulic pressure regulating valve becomes loose. If there is no change after pressurization, the valve core may not be able to lift the pressure due to wear and tear due to long-term use;
- 2. The solenoid valve has been used for too long, the valve core is worn, and the pressure is not working due to large leakage;
- 3. Leakage of pressure-maintaining check valve (if there is any on your oil line);
- 4. Wear or aging of the seal ring on the piston head in the oil cylinder causes oil to leak and can not lift the pressure;
- 5. The hydraulic pump of the Hydraulic Press wears and leaks for a long time;
- 6. The oil temperature is too high in hot weather, and the hydraulic oil is too thin to raise the high pressure;
- 7. Leakage of oil pressure pipeline, oil cylinder welding spot, piston rod seal, etc.;
- 8. The oil level of the oil tank of the single-arm hydraulic machine is insufficient, and the oil filter is emptied.
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