MaintenanceItem no. 10301084, Revision 08 33 ( 40 )12.2.3 Every time the clamping device is changedÜ Clean the inner taper of the HF spindle shaft. The inner taper must be freeof chips and contamination.Ü Clean the tool taper.Ü Apply a light greasy film to the taper of the collet after cleaning.Ä Only use the collet grease from the service set.This improves the sliding movement and increases the clamping force of thecollet.12.3 In the case of storageIf the HF spindle is not required for a prolonged period of time:Ü Store the HF spindle in horizontal position.Ü Store the HF spindle so that it is protected from moisture, dust, and otherenvironmental influences.Ü Note the following storage conditions.Temperature of storage location +10°C … + 45° CRelative humidity < 50 %12.4 Monthly maintenanceÜ Turn the shaft of the HF spindle at least ten times by hand every fourweeks.12.5 Long periods of storageÜ Turn the shaft of the HF spindle at least ten times by hand every threemonths.Ü Then put the HF spindle into operation with a tool inserted for approx.10 minutes.Ä The speed should be no more than 20 % of the maximum permissiblespeed for the HF spindle. (See Commissioning [} 26] section)12.6 Maximum storage timeThe maximum storage time is 2 years.Ü Make sure that all information in the "Long periods of storage [} 33]" sec-tion is adhered to. This is the only way in which to maintain the functional-ity of the HF spindle.