NSK Ti-Max X450L Manuel D'opération page 19

10. Routine Maintenance Checks
Perform routine maintenance checks every three months. If any abnormalities are found, contact your authorized NSK Dealer.
Points to check Details
Head cap is loose Check that the Head Cap is firmly tightened.
Rotation Rotate the handpiece and check for abnormalities such as abnormal rotation, vibration, noise, and overheating.
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