All sealed type bearings have a cap, which, among other things, creates a lot of problems when trying to re-lubricate a complex mechanism. Attempts to open the cover latch without proper experience and qualifications most often end sadly: it becomes almost impossible to assemble such a bearing back. What can be done to avoid being in such a situation?
The simplest solution that will allow you not to break a closed type bearing is not to touch anything. Strictly speaking, try to lubricate it without disassembly. It should be noted right away that if the bearing has a threaded hole, then it should be immediately plugged so that grease does not get into it.
In addition, to carry out the bearing lubrication operation, we need a variety of syringes with rubber pistons: 10 ml, 50 ml, 150 ml.
Next, you need to take the bearing in your hands and find a hole on it through which it will be possible to introduce grease. It is located on the inner edge of the clip covered with a lid. It may be necessary to cut off part of the nose of the syringe to simplify the work. The desired syringe is selected according to the appropriate diameter. Before starting work, be sure to worry about the protection of the catalyst. Only after that the syringe is filled with lubricant.
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The bearing is loaded with grease. Everything superfluous in the end will be removed from the structure anyway. In this case, it is strictly forbidden to fill the bearing with grease completely. Fill the bearing should be approximately 1/3 of the total volume. During the laying of the lubricant, the syringe is pressed as tightly as possible. The first and most eloquent signal that it is time to stop will be the appearance of grease from the back of the bearing.
In continuation of the topic, read about what oil level should be on the dipstickand how often it should be checked.
Source: https://novate.ru/blogs/170422/62747/