Industrial gear units – Operating and Assembly Instructions
72 B 1050 en-1819
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5.2.5 Shaft sealing rings
Shaft sealing rings are rubbing seals and have sealing lips made from an elastomer material. These
sealing lips are lubricated with a special grease at the factory. This reduces the wear due to their
function and ensures a long service life. An oil film in the region of the rubbing sealing lip is therefore
normal and is not due to leakage (7.7 "Leakage and leak-tightness")
Once the shaft sealing ring has reached the end of its service life, the oil film in the region of the
sealing lip increases and a measurable leakage with dripping oil occurs. The shaft sealing ring must
then be replaced.
The space between the sealing lip and the protective lip must be filled approximately 50 % with grease
on fitting.
Recommended grease: Petamo GHY 133N - Klüber Lubrication (7.3.1 "Roller bearing greases")
Take care that after fitting, the new shaft sealing ring does not run in the old wear track.
Information
Replacement of MSS7 seals:
MSS7 seals are two-part seals which consist of a liner with an axial dust lip and a radial shaft sealing ring with a
radial dust lip (unterhalb). Special installation rules must be observed when replacing these seals in order to
achieve a normal operating life. Please contact the NORD Service department in case of any queries.
1 Bushing
2 MSS7 seal
3 Shaft
Figure 26: MSS7 seal
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