In the process of using SKF bearing, grease is critical. If, the use of the metamorphic grease of not only lose due effect, but to still can damage bearing.
(1) observation overflows
Take two cups, one of which filled the lubricating oil need to be checked out, and the other an empty on the desk, will be filled with oil's cup lifted from 30-40 cm desktop and tilt, let the oil flow to the empty cup slowly, observe the flow condition, quality good oil duct is a slender, should be uniform, continuous, if appear, fast and slow commercial, or down large, the said oil already metamorphism.
(2) the hand twist method
Will lubricating oil in his thumb and forefinger twined between repeated grinding, a good oil hand feel lubricity, honing, no less friction, if feel the sand between fingers and friction are larger, indicates that lube impurities, can't use, should replace new lubricating oil.
(3) illumination method
When the weather is fine day, with a screwdriver will lubricating oil pulled up, and the horizontal plane into 45 degree Angle. Controlled sunshine, observation oil droplets, on the illumination, can be clear to see no oil honing for good, can continue to function, if too many honing, should be replaced lubricating oil.
(4) the oil droplets trace method
Get a clean white paper filter, oil dripping few drops in filter paper, wait for after oil leakage, if the surface has black powder, touch have resistance acerbity feeling, show lubricating oil has many impurities inside, good oil without powder, with the hand feels dry and smooth, and yellow trace.




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