In the maintenance field, alignment check of dynamic equipment plays a very important role. So does lubrication of moving parts. While browsing around for good articles on such maintenance topics, I came across the linked article that gives good insights on reasons for failure, remedies and other recommendations.
Tracking the causes of coupling failure
Bob Boyle, PlantServices.com
Explore coupling maintenance and the telltale signs of failure to maximize coupling life and ensure reliable system operations.
This is one area where a lot expertise is available. All viewers and readers are requested and invited to share their unique experiences on this topic.