Industrial gear units – Operating and Assembly Instructions
106 B 1050 en-1819
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7.7 Leakage and leak-tightness
Gear units are filled with oil or grease to lubricate the moving parts. Seals prevent the escape of
lubricants. A complete seal is technically not possible, as a certain film of moisture, for example on the
radial shaft sealing rings is normal and advantageous for a long-term seal. In the region of vents,
moisture due to oil may be visible due to the escape of oil mist because of the function. In the case of
grease-lubricated labyrinth seals (Option: Taconite) grease emerges from the sealing gap. This
apparent leak is not a fault.
According to the test conditions according to DIN 3761, the leak is due to the sealing medium.
Definition of leakage according to DIN 3761 and its appropriate use
Term Explanation
Location of leak
Shaft sealing
ring
In IEC
adapter
Housing joint Venting
Sealed
No moisture apparent No fault No fault No fault No fault
Damp
Moisture film locally
restricted (not an area)
No fault No fault No fault No fault
Wet
Moisture film beyond the
extent of the component
No fault No fault
Repair if
necessary
No fault
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