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In case of complete drives, the direction of rotation of the motor has to be checked by means of
a phase meter.
Rotation of gear unit in reverse direction, even momentarily, may damage the
backstop, and consequently is not allowed.
Units equipped with heaters must not be started before oil temperature is above 5°C (40°F).
Heaters are automatically disconnected when oil temperature is above 15°C (60°F).
Temperature of oilbath will rise with increased load. Continuous operating temperature of 95°C
(200°F) is allowable for a standard gear unit filled with mineral oil.
9.2. GEAR UNITS WITH FORCED FEED LUBRICATION
For the different parts of the lubrication system, refer to service manual of the lubrication and
cooling equipment and/or the technical leaflets concerning the specific components.
9.3. GEAR UNIT DRIVEN BY A TWO SPEED MOTOR
When switching from the higher to the lower speed, first decelerate so that the motor must
accelerate when switched on at the lower speed. In this way high synchronisation peak torques
can be avoided.
10. MAINTENANCE
Maintenance operations are limited to check oil level, to regular oil change, to regrease the
lubrication points and filter cleaning.
OIL QUANTITY : see paragraph 6.4, page 15.
OIL DRAINING : see paragraph 6.8, page 18.
Read also points in the other paragraphs.
10.1. INSPECTION AND MAINTENANCE
Rotating parts may cause harm and damage.
For inspection and maintenance always deenergize the drive and make sure
that the drive is secured against inadvertent switch-on or movement.
10.2. OIL CHANGE
The first oil change should be carried out preferably after 100 hours and not later than 800
hours of operation. The removed oil may be used again after filtering. Filter the oil volume at
least 10 times. Use a 10 µm filter or smaller.
Subsequently the oil should be renewed after 4000 to 8000 hours or max. 18 months of
operation depending on working conditions. Use clean oil out of clean drums. Entrance of
abrasive particles and water must be avoided. The water content should be kept below 0,05%.
If the lubrication system has an oil filter, change the filter cartridge every 800 hours of operation.
Operating procedure and specifications are mentioned in the service manual of the lubrication
and cooling equipment and / or the technical leaflets concerning the specific instrumentation.
Only steel mesh filter cartridge may be used again if thoroughly cleaned in a solvent.
When operating continuously either at oil temperatures of 80° to 95°C (175 to 200°F) or in dusty
or humid atmosphere, it is recommended to have oil analyses by oil supplier or qualified
laboratory at least after 4000 hours in order to define exact lifetime of oil bath.
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