A hydraulic press (a type of hydraulic press) is a kind of hydraulic fluid that uses special hydraulic oil as a working medium and a hydraulic pump as a power source. The hydraulic force enters the cylinder / piston through the hydraulic line through the force of the pump, and then there are several The seals of the group cooperate with each other, the seals in different positions are different, but they all play the role of sealing, so that the hydraulic oil cannot leak. Finally, the hydraulic oil is circulated in the oil tank through the check valve to make the cylinder / piston work circularly to complete certain mechanical actions as a kind of machinery for productivity.       一  Cause of oil leakage：    1.Oil leakage caused by hydraulic system pollution    2.Oil leakage caused by high oil temperature in hydraulic system   3.Oil leakage caused by problems in hydraulic system oil seal   4.Problems with hydraulic seals in the hydraulic system cause oil leakage        二  Measures to prevent hydraulic oil leakage of hydraulic press    1. The hose line needs correct equipment;   2. The correct device of the hard pipe pipeline;   3. Check the quality of hydraulic tubing to prohibit unqualified tubing.   4. Correct use and installation of seals to ensure the protruding condition of the seals.