Siemens 1MB115 Installation And Maintenance Manual page 130

• Rolling bearing service life
– Replace the rolling bearings once the nominal service life is reached.
– In the case of rolling bearings without a regreasing system, it is
– The rolling bearing service life under full specified load is at least 20 000
– The nominal rolling bearing service life of machines which are not subject
• For rolling bearings with external oil supply, monitor that lubrication is
maintained.
7.1.8 Repairing
7.1.8.1 Explosion protection for machines with type of protection "Ex d"
For explosion-protected machines with type of protection "Ex d" or "Ex db"
in accordance with IEC / EN 60079–0 and IEC / EN 60079–1, observe the
following:
• Machined bearing and fitting surfaces on the following components must
not be reworked or painted:
– Stator frame
– End shields, bearing cover
– Motor shaft
– Gland plate
– Terminal box lower part, terminal box cover
– Gland plates for additional terminal boxes, where present
• Keep these surfaces clean and protect them against corrosion by applying a
thin coating of grease. It is not permissible that any seals are fitted between
the surfaces that guarantee that flame is not transmitted.
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Alternatively, you can verify they are free of mechanical damage as part
of an inspection.
ensured that the nominal service life will only be achieved clearly after
achievement of the service life of the grease in the bearings.
hours for machines subject to radial or axial forces.
to any forces is at least 40 000 hours.