Before the cross roller bearing leaves the factory, some high-quality Lithium complex grease have been injected in to the bearings. So, the bearings can be used directly when you get that. But after long time revolves, the grease will lose . That will cause the friction drag rise and life reduces, at this time you can add grease through the oil hole which is connects with the grease groove of the inner ring or outer ring of the bearings. According to the different use condition, supplement cycle approximately is 1-6 months, please use the same grease to fill when supplement, and uniform distribution in bearing internal structure; The sealed cross roller bearing may extend the lubrication cycle suitably. Please avoid to use different grease in one bearing

After added the grease, at the beginning, the lubriation torque may rise temperature, when the over grease  overflow from the oil seal, the lubriation torque will return to the normal level in short time.

*X* If the bearings works in the situation of strong shake, vacuum, high temperature, low temperature, or other special condition , common grease can not be used , please contact with HONGYUAN.