Grease life for capped bearings

Grease life for capped bearings should be estimated according to the procedure described in this section. The grease life for capped bearings is presented as L10, i.e. the time period at the end of which 90% of the bearings are still reliably lubricated. The method to estimate relubrication intervals (→ Relubrication intervals) represents the L01 grease life and should not be used.
The grease life for capped bearings depends on the operating temperature and the speed factor. It can be obtained from diagram 1. The grease performance factor (GPF) is listed in table 1.
The grease life is valid under the following operating conditions:
  • horizontal shaft
  • inner ring rotation
  • light load (P ≤ 0,05 C)
  • operating temperature within the green temperature zone of the grease (table 1)
  • stationary machine
  • low vibration levels
For bearings filled with VT378 grease, use the scale corresponding to GPF = 1 and multiply the value obtained from the diagram by 0,2.
If the operating conditions differ, the grease life obtained from diagram 1 has to be adjusted:
  • For vertical shafts, use 50% of the value from the diagram.
  • For heavier loads (P > 0,05 C), use the reduction factor listed in table 2.
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