Siemens SIMOTICS GP Operating Instructions Manual page 94

WARNING
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 occurs. 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.
Replacing bearings in explosion-proof machines
● When changing the bearings, renew the sealing rings and only
use original Siemens spare parts.
● For radial sealing rings with dust protection lip (DIN 3760-AS),
completely fill the spaces (100%) in the sealing ring as well as in the bearing
shield hub with a suitable grease.
Note:
For explosion-proof motors, only use spare parts and original repair parts.
WARNING
Danger of falling parts while changing bearings.
In large frames and due to the weight of the components to be extracted,
the following safety instructions must be carried out.
1.- Fan cover: It is necessary to use synthetic flat slings with a capacity
greater than 150 kilograms for the adequate lifting of the fan cover.
1.1.- Remove the protective cover from the fan cover and proceed to
pass the flat sling so that it completely supports the fan cover.
1.2.- Lightly tighten the lifting system with the sling and proceed to
remove the fastening screws of the cap until its complete release.
2.- End shields: For the safe extraction of the end shields or C flanges, it
will be carried out in the following way:
2.1.- Slightly loosen all the fastening screws with the housing in such a
way that when removing one of the upper screws it can be replaced by an
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