A thrust bearing can run hot for many reasons—such as excessive load and/or speed, inadequate oil supply or an axial clearance that is too tight. Typically, the reason a thrust bearing runs hot is because, for whatever reason, the load has increased. Time could be spent trying to address the root cause of the problem (the increased load, and indeed that task should be undertaken in parallel) or a redesigned bearing could be installed to address the symptom (a hot running bearing).