I have a Kiwa Excel center-4 with the 3m-c control. I had to replace the z axis dc servo motor model A06B-0642-B011. After replacing the motor the movement is ok but the motor is making a squealing or squeaking sound when sitting still. The sound is not that loud, just noticeable. I'm afraid if I don't do something about the sound it might damage the motor or motor drive. Thanks everyone. Dan