Bushing is to use a sliding sleeve bearings, used lubricating oil as a lubricant and resistance-reducing agent, used in the early days when oil imports bearing low running noise, low manufacturing costs, but serious bushing wear life than ball bearings have a big gap.
Oil bearing and use a long time, due to the reasons of oil seal, will gradually volatile oil and dirt enters the bearing, causing devices slow speed, noise increases and so on.



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