- The primary function of these seals is to maintain system efficiency by preventing fluid loss, which could lead to decreased performance, increased wear, and even equipment failure. The seal's ability to withstand high pressure is crucial, as it directly impacts the reliability and longevity of the machinery. They are typically made from materials with exceptional resistance to pressure, heat, and chemical degradation, such as rubber compounds, polyurethane, or PTFE (Teflon).


Standard 3760/3761
As type A with dust lip
Double metal cased
An oil seal consists of:
Despite being a great substitute for more expensive high temperature resistant materials, polyacrylate has a problem of poor water compatibility and cold flexibility.
Preparing to replace the sump gasket
The sealing lip is always made of a rubber or synthetic material. For oil seals with a rubber outer case (R, RST, GR, GRST), the rubber quality of the sealing lip and the outer case are the same.
Improper
Seals are classified by O.D. wall material, lip type, and whether they have a spring or not.
Major oil seals are specified in ISO 6194-1 and JIS B 2402-1.
Table 2 shows the common types of oil seals, while Table 3 shows the features of each type of oil seal.
Table 4 lists the JTEKT oil seal type codes and corresponding ISO and JIS standards.
What are oil seals?
OIL SEALS
AS