BA 9142 en 02/2015
5.3.4
Labyrinth seals
The input shaft and output flange are sealed with labyrinth seals. Air filters are provided on the housing to
regulate the pressure.
Labyrinth seals are non-contacting seals. Labyrinth seals prevent wear and tear on the shaft, are
maintenance-free and ensure favourable temperature characteristics.
1
2
Fig. 7:
Labyrinth seal (schematic illustration)
1
Labyrinth seal on output flange
2
Labyrinth seal on input shaft
NOTICE
Property damage
Deficient lubrication is possible from oil leakage on the gear unit.
For reliable operation, labyrinth seals require stationary, horizontal positioning away from dirty water
and high dust concentrations.
Overfilling of the gear unit can cause leakage, as can oil with high foam content.
5.4
Drive coupling
A flexible coupling is to be provided for the gear unit drive. Observe the operating instructions of the
coupling for assembly, operation and maintenance of the coupling.
NOTICE
Property damage
Damage to the gear unit or individual components is possible from inadequate alignment.
When installing the drives, make absolutely certain that the individual components are accurately
aligned to one other. Unacceptable large errors in the alignment of the shaft ends to be connected due
to angular and/or axial misalignments result in premature wear and material damage.
Note
If couplings of other manufacturers are used, the Siemens standard operating instructions for
equivalent couplings provide the minimum requirements for the alignment of the coupling. It cannot be
assured by Siemens whether these minimum requirements are sufficient in any case. If stricter
requirements in the operating instructions of the supplier or similar document are defined, these will
apply.
