Please share your experience on what can cause an up thrust on a vertical small deep well pump motor. Our facility rebuilt a 75hp 2-pole vertical motor only, a couple months ago and it was pulled for high vibration on the top end (thrust bearing end) After close inspection the lower guide bearing shows signs inside the outer race, a wear grove as if the bearing was operating in an up thrust position for an extended length of time. End play adjustments are at specifications of .008
Note: The lower guide bearing also shows signs of heat and lubrication was starting to breakdown. The top end looks fine?
Thanks in advance! motorhead
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