How to check whether bearing grease has deteriorated? Follow the editor of 6900 Series Bearing For sale to learn about it!
1. Illumination
On a sunny day, use a screwdriver to lift up the oil at a 45-degree angle to the horizontal. Observe the oil droplets against the sunlight. Under the light, you can clearly see that there is no wear debris in the lubricating oil, which is good and can continue to function. If the wear debris is too much, the lubricating oil should be replaced.
2. Oil drop trace method
Take a clean white filter test paper and drop a few drops of oil on the filter test paper. After the lubricating oil leaks, if there is black powder on the surface and you feel astringent when you touch it with your hand, it means that there are many impurities in the lubricating oil. The lube is powder-free, dry and smooth to the touch with yellow marks.

3. Oil flow observation method
Take two measuring cups, one contains the lubricating oil to be checked, and the other is empty on the table. Lift the measuring cup full of lubricating oil 30-40 cm away from the table and tilt it to let the lubricating oil slowly flow to the empty cup. In the middle, observe its flow, the oil flow of good quality lubricating oil should be slender, uniform, and continuous.
The above is the editor of 6900 Series Bearing For sale:A brief introduction to some knowledge about checking whether the bearing grease has deteriorated.