State refers to so-called appears bearing burn injury: NSK bearing Raceway round, rolling elements and cage spinning rapidly heating until the discoloration, softening, cladding and tear.
NSK bearing burn caused mainly due to poor lubrication of the bearing, lubricant that may use irregular or excessive lubricant, too little is not correct. Related information on NSK bearing lubrication, please refer to this website "misunderstanding of grease used in the repair process of NSK bearings" and "Introduction to NSK bearing lubrication technology in" Introduction to these two articles.
Secondly might be too much load (preload is too large). Excessive speed. Clearance is too small. Water or other foreign bodies penetrated. If the above two conditions are not so is the poor accuracy of axle and bearing boxes, large deflections of the shafts. See here, I think we all want to know the way of solving the problem, first of all, to research on lubricant and lubrication method, selected bearing lubricant and its dosage, NSK bearings but also to correct the selection. Research in line with, bearing clearance and preload, and improved sealing device. Check accuracy of the shaft and housing



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