When your thrust bearing is running hot it is natural to think that there is something wrong with it but that is not always the case. Bearing performance information can give you the symptoms of what is wrong with your machine.
Non-equalizing thrust bearings can only tolerate a limited amount of misalignment and still continue to operate. For this reason, you should learn how to determine the maximum amount of misalignment before the bearing's performance is adversely affected.
The purpose of thrust bearing end play is to provide axial clearance between the thrust collar and the thrust bearing assemblies. The end play allows room for the formation of an oil film, misalignment, and thermal expansion of the bearing components. End play is the total distance the shaft can move between the two thrust bearings and is sometimes called float, thrust bearing clearance or axial clearance.