(1) structure design is not reasonable including design calculation error; Structure design, size, precision is not appropriate; Bearing alloy material, coating materials and bearing backing material, lubricating oil improper selection, etc.

(2) the production process defect, and processing quality including bearing alloy of sintering, pouring and double sheet metal rolling and the plating coating complex process defect, mechanical processing technology such as backward, cause NSK bearing alloy material metallographic organization, composition, performance, and size accuracy did not meet the design requirements.

(3) the assembly process bad including the assembly process behind, production management is not civilization, not strictly; After the assembly is not up to the original design of the assembly accuracy requirements. Diesel engine before they leave the factory not science, not appropriate adjust, will lead to the early damage of bearing.

(4) the use and maintenance operation specification is not sound not including, maintenance system not to be lax, user operation of duty, the excessive overload, speeding artificial or accidental condition and environment such as bad.

(5) other parts involved by the failure of the lubricating oil, improper selection filter or failure, housing or shaft neck too large deformation and damage, vibration, etc can cause bearing the corresponding damage.
To sum up, the causes for the damage of bearing FAG apparently is various, is more complicated. Also, the damage phenomenon is based on the comprehensive results appear, so lubrication for bearing failure analysis on some damage when real phenomena as according to, with system engineering point of view, one comprehensive research, find out the main factors, the secondary factors, "suit the remedy to the case", so as to make correct and effective prevention corrective actions. More important, the maintenance method is random inspection, take the intellectual maintenance measures.
 



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