Is the oil in deep groove ball bearings normal?

Update:05-07-2019
Summary:

In fact, the deep groove ball bearing grease is normal, […]

In fact, the deep groove ball bearing grease is normal, because deep groove ball bearings need grease lubrication to prevent rust and lubrication when running, especially sealed deep groove ball bearings, can not run at high speed without grease bearings The life expectancy is greatly shortened. The survival of deep groove ball bearings is from one process. After assembling the inner and outer rings of the bearing and assembling the steel balls and cages, first flush them, rinse them and then press the sealing cover on one side, then press the bearings. Turn over and add lubricant (usually 30%~35% of the internal volume of the bearing), then press the cover. It is usually done by adding lubricant to one side and then turning the deep groove ball bearing so that it can hold the lubricant on both sides. Let the lubricating oil in the deep groove ball bearing rotate evenly, so it will not affect the use.

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