First of all, we need to check whether the rubber seal is broken. If it is broken, then the causes of this phenomenon are:

1. Selection and quality of rubber seals.The performance required by the hydraulic system, whether the performance of rubber seals has reached, whether the rubber seals have burrs, edges and corners, the production process and formula of rubber seals have problems, etc.
2, the installation of rubber seals.In the process of installation, there is no damage to the hydraulic seal, destroy its internal molecular structure behavior etc.
3. No lubrication, or use solid lubricant.Failure to lubricate will cause excessive wear and failure of rubber seals.
4, whether the contact surface is smooth, hydraulic oil and rubber seal compatibility, will lead to rubber seal damage and accelerated aging.
5, the service life of rubber seals reached the limit.
Secondly, if the failure of rubber seals is excluded, then we need to:
1. Check the unreasonable size of sealing groove.The width of the sealing groove is too large, too deep and other unreasonable design, will lead to insufficient compression, resulting in leakage.
2. Check if the cooling device of oil tank has failed.High temperatures can also cause rubber seals to age too quickly, leading to leaks.
3. Check whether the hydraulic components and pipe joints are suitable.
4. Check the coaxiality of piston and cylinder.Too much eccentricity can damage rubber seals.
Finally, we need regular inspection and maintenance.Ensure the normal operation of hydraulic seal system.