Grease is very critical in the use of NSK bearings. If a deteriorated grease is used, it will not only function as it should, but it will also damage the NSK bearing.
Illumination method
On a clear day, use a screwdriver to pick up the NSK bearing lubricant at a 45-degree angle to the horizontal. Observe the sunlight and observe the oil droplets. Under the illumination, it can be clearly seen that there is no wear debris in the bearing lubricating oil, which can continue to work. If the grinding debris is too much, the lubricating oil should be replaced.
2. Oil droplet trace method
Take a clean white filter paper, drop a few drops of oil on the filter paper. After the oil leaks, if there is black powder on the surface, touch the hand with a feeling of resistance, it means that there are many impurities in the lubricant, good lubricant No powder, it is dry and smooth by hand, and it has yellow marks.
3. Oil flow observation method
Take two measuring cups, one of which holds the NSK bearing lubricant to be inspected, the other is placed on the table, and the measuring cup filled with lubricating oil is lifted off the table 30-40 cm and tilted, so that the NSK bearing lubricant is slowly Flow into the empty cup and observe the flow. The quality of the lubricating oil should be slender, even and continuous. If there is a sudden flow of oil, sometimes there will be a large flow, then the lubricant has deteriorated. .
4. Handcuffs
The NSK bearing lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means There are many impurities in the lubricating oil, which can no longer be used. New lubricants should be replaced.
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