To act as a physical barrier retaining the lubricating oil where it is bound to be.
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② - When replacing, the PTFE sealing lip of the new oil seal should not be in the same position as the old oil seal. The diameter of the sealing lip should be smaller than the shaft diameter.
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.