MaintenanceItem no. 10301084, Revision 0832 ( 40 )12 MaintenanceOnly specialist personnel may perform maintenance on the spindle.The HF spindle must be shut down before any maintenance work.Ü Make sure that the shaft of the HF spindle has come to an absolute stand-still.Ü Before carrying out any work, read the corresponding section of the man-ual carefully again.Ü Observe the manual of the machine in which the HF spindle is installed.Ü Observe all safety instructions and safety rules.12.1 Ball bearingsNote: Foreign matter reduces the service life.The HF spindle bearings have lifetime grease lubrication. This means thatthey do not require maintenance.u Do not lubricate the ball bearings.u Do not apply grease, oil, or cleaning agents to the openings of the HFspindle.12.2 Daily cleaningTo ensure that the HF spindle functions safely and accurately, all contact sur-faces of the HF spindle, the mount for the HF spindle, the tool mount, and thetool holder must be clean.Note: Foreign matter reduces the service life.u Do not use compressed air to clean the HF spindle.u Do not use ultrasonic cleaning on the HF spindle.u Do not use steam jets to clean the HF spindle.This could cause contamination to enter the bearing area.12.2.1 Before commencing workÜ Check that all surfaces are thoroughly cleaned and free of dust, grease,coolant, machining residues, and metal particles.Ü Check that the HF spindle is free of damage.Ü If the HF spindle is equipped with sealing air, always switch this on duringcleaning.Ü Only use a clean, soft cloth or a clean, soft brush for cleaning.12.2.2 With every tool changeÜ Ensure that the tool mount and tool shank are clean.Ä Remove any soiling.