Leakage / Leaktightness - Siemens Flender H2NV Series Assembly And Operating Instructions Manual

9.2.1

Leakage / leaktightness

In DIN 3761 information is given on the subject of leakage on gear units. Based on this and building on the
extensive experience gained at Siemens and other FVA member companies, brief descriptions, required
measures and notes on this subject are listed in the following overview.
Table 12: Notes on the leaktightness of radial shaft­sealing rings (RWDR)
Condition
Leaktight, dry
Leaktight, damp
Leaktight, wet
Measurable leak
Temporary leak
Apparent leak
Escaping oil mist from a ventilation valve or a labyrinth seal is functional and therefore
not a reason for complaint.
Description
No moisture to be seen on
radial shaft-sealing ring.
Film of moisture formed
functionally in the area of
the sealing edge but not
extending beyond the
bottom side of the radial
shaft-sealing ring.
Moisture film extending
beyond the bottom side of
the radial shaft-sealing
ring but not dripping.
Small trickle to be seen on
the bottom side of the
radial shaft-sealing ring,
dripping.
Short-term failure of the
sealing system.
Temporary leak.
BA 5060 EN 04/2011
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Measures
None
Clean carefully only, if The radial shaft-sealing
dirt adheres; observe. ring often dries by itself in
further operation.
No reason for complaint
Wipe away with a The radial shaft-sealing
clean cloth; observe. ring often dries by itself in
further operation.
No reason for complaint
If necessary, change May be a reason for com­
radial shaft-sealing plaint.
ring; identify possible One drop of oil a day is
cause of radial shaft- acceptable.
sealing ring failure and
rectify.
Wipe away with a E.g. through small
clean cloth; observe. particles on the seal edge,
which can be removed
again in further operation
No reason for complaint
Wipe away with a Due mostly to excessive
clean cloth. grease filling between seal
and dust lip or oil secre­
tions from the grease filling
of labyrinth seals.
No reason for complaint
Notes