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Operating Manual Gearbox
Commissioning and operation
5.2.1 Determining the lubricant service life
Information
The expected service life of the lubricant depends on the gearbox temperature. The
thermal suitability of the gearbox must be taken into account when selecting the
gearbox. Using the lubricant beyond the service life can lead to premature wear of
the gearbox.
• Determine the surface temperature in the thermally steady state for each load
expected on the gearbox during operation.
• Check the surface temperature at several locations to determine the highest
temperature. Expected differences with regard to the ambient temperature must
be taken into account proportionally.
• Determine the lubricant temperature by adding 5 °C to the highest surface
temperature measured.
• Define the expected or desired operating time t at the respective lubricant
temperature determined.
• Check the lubricant as listed in the technical specifications and determine the
range of the expected lubricant service life by means of the following diagram for
the maximum and minimum characteristic curve of the lubricant used in each
case.
30.000
20.000
10.000
5.000
1.000
50 60 70 80 90
Lubricant service life [h]
Lubricant temperature [°C]
PLE, PLQE, PLPE, PLHE,
PLFE, PFHE, WPLE,
WPLQE, WPLPE, WPLHE,
WPLFE, NGV
PSBN, PSN, PLN,
PSFN, PLFN,WPLN,
WPSFN, WGN
t
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