Maintenance
Explosion-protected machines
140 56100000002002, 01/2016
Explosion hazard due to increased surface temperature
Components within the motor may be hotter than the maximum permissible surface
temperature for the enclosure. In an explosive atmosphere, dust can ignite and an
explosion occur. This can result in death, serious injury or material damage.
• Do not open the motor in an explosive and dusty atmosphere when it is still at
normal operating temperature.
• Allow the machine to cool down before opening it.
9.5.1 Bearings
Refer to the rating plate or the catalog for the designations of the bearings being
used.
Bearing lifetime
Prolonged storage periods reduce the useful lifetime of the bearing grease. For
permanently lubricated bearings, this reduces the bearing service life.
We recommend that the bearings or grease are replaced after a storage time of 12
months; if the time exceeds 4 years, replace the bearings or the grease.
Replacing bearings
Recommended interval after which bearings are to be replaced under normal
operating conditions:
Table 9-1 Bearing replacement intervals
Bearing replacement
intervals
40 °C Horizontal coupling opera-
40 000 h
40 °C With axial and radial forc-
20 000 h
● Do not reuse bearings that have been removed.
● Remove the dirty spent grease from the bearing shield.
● Replace the existing grease with new grease.
● Replace the shaft seals when the bearings are replaced.
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