2 Maintenance and servicing
B 1091 en-3118 21
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2.3 Maintenance intervals
The motor must be checked weekly, or every 100 operating hours for unusual running noise and/or
vibrations.
Please check the roller bearings at an interval of at least 10,000 h and replace them as required. In
addition, the electric connections, cables and wires as well as the fan are firmly fastened and free from
damage. Furthermore, the function of the insulation system must be checked.
Replace the shaft sealing rings every 10,000 hours.
The surface of the motor must not have any dirt deposits which could impair cooling.
A general overhaul of the motor must be carried out every 5 years.
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2.4 General overhaul
For this the motor must be dismantled. The following work must be carried out:
• All components of the motor must be cleaned
• All components of the motor must be examined for damage
• All damaged components must be replaced
• All roller bearings must be replaced
• All seals and shaft sealing rings must be replaced
The general overhaul must be carried out by qualified personnel in a specialist workshop with
appropriate equipment. We urgently recommend that the general overhaul is carried out by NORD
Service.
If the drive unit is subjected to special operating conditions, the intervals stated above may be
considerably reduced.
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