The performance of the bubble eliminator on aging behavior of the hydraulic oil is described. Oil degradation is accelerated with effective oxygen supply of air, the most influential factor in shortening the life of the oil. In order to investigate the effectiveness of the bubble eliminator, changes of oil degradation are experimentally measured in our laboratory’s test bench under operating conditions during 456 hours of continuous running with blowing air in the oil. It is clarified in the experimental tests that the increase of the total acid number can be prevented using the bubble eliminator.
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