i do warranty work for a large pump manufacture and recently i have noticed a large number of motor bearing failures. the bearings that are fitted are de c3 and nde c4 differant sizes. the failure is a high pitched what i would like to know is. is this due to the temp of the application and the clearance of the bearings. when motor is stripped the bearings feel ok so i am at a loss at why they are failing. if anyone could explane/help please.
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