Failures of conveyor pulleys such as shell deformation,shaft journal bending,rubber lagging delamination and bearing seizure are most likely not caused by service wear,but by improper model selection in the early stage.Once a pulley is incorrectly selected,it will not only result in premature scrapping of the pulley itself,but also trigger a series of cascading problems including belt deviation,belt tearing, equipment shutdown and soaring maintenance costs.