Lubricating bearings on a regular PM schedule has some inherent problems-mainly, how do you know if a bearing needs lubricating or not? If the bearing seal is not compromised, grease should stay in the bearing, and provide lubrication for a long time. But if the seal is blown, the bearing will require frequent lubrication. Not to keep the bearing lubricated, but to keep contaminants out. The grease in essence becomes the “seal”.
There are many tools on the market to use in conjunction with lubrication – mechanic’s stethoscopes, “smart” grease guns which use ultrasonic, or just an ultrasonic tool itself. High frequency vibration measurements can also do this.
Author: Steve Gordon
Co-author: Stan Riddle