(1) choose the right seal material and hydraulic oil, and the adaptability to the working temperature, the compatibility of the oil. (2) the geometrical position accuracy (for example, the hard chromium) and the surface roughness can be extended to the use life of the relative sliding parts of the seal. (1) for the use of hydraulic pump and motor shaft neck seal requires not only the sliding surface rough degree in RA is less than 0.25 m, and hard chromium plating on the surface and in the specific use also need according to the specific situation appropriate adjustments to the oil seal lip radial spring force, the elastic moderate and in the installation but also with a sleeve or shim were fitted to protect the seals, lest lips rolled, twisted, resulting in spring slide out. In the hydraulic cylinder, the surface roughness is improved, and the surface roughness is improved, and the service life of the sealing ring can be extended. In addition, the use of the pressure, the length of the sliding surface and the type of service life also has a great impact. Therefore, it should be based on these conditions to determine the time to decide. The lubrication condition of sealing surface is good, and the dirt is prevented. It is also necessary to use the oil and liquid and the correct installation method to achieve the required level.
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