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Gurumoorthy K.,National Engineering Industries Ltd NEIL | Dayma J.P.,National Engineering Industries Ltd NEIL | Rawat V.,National Engineering Industries Ltd NEIL | Khaire M.V.,National Engineering Industries Ltd NEIL
Journal of Failure Analysis and Prevention | Year: 2015

Premature bearing failures can be attributed to several factors such as improper selection of bearing, rise in temperature, corrosive media, dirt, abusive handling, improper installation, and servicing practices. In the present study, damage analysis made on the prematurely failed differential pinion tapered roller bearing is discussed. A detailed metallurgical analysis is carried out on the failed bearing and the probable root cause was traced to higher preload on the bearing resulting in temperature rise and degradation of lubrication. Excessive preload caused rubbing of rollers against the cone rib leading to temperature rise. This in turn degraded the lubricant and caused eventual seizure. The steep rise in temperature was confirmed by the presence of untempered martensitic structure in the raceway load zone of the cone. © 2015, ASM International.

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