Lubricating oil pump
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Why do some pumps require a separate lubricating oil pump for forced lubrication?
Because some pumps require forced lubrication.
It is determined by the method of bearing lubrication; since some require forced lubrication, an external oil pump is necessary to achieve lubrication. There are also some cases where lubrication can be achieved simply by providing oil grooves at the bearings.
First: It is mainly determined by the method of bearing lubrication, as some systems require forced lubrication, which necessitates the use of an external oil pump to achieve lubrication. Second: There are also cases where lubrication can be achieved simply by providing oil grooves at the bearing locations