In the process of using SKF bearings, grease is critical. If, using the deterioration of grease, not only achieve its proper role, so they will damage the bearings.
① oil flow observation
Take two cups, one containing the lubricant to be checked, the other empty on the table, the cup will be filled with oil to leave the desktop 30-40 cm high lift and tilt to allow oil to flow slowly empty cup , the observed flow, good quality lube oil flow should be thin, uniform, continuous, if there oil flow unsteadiness, and sometimes a large shed, is that oil has gone.
② hand twist method
Twist in the lubricant between the thumb and index finger repeatedly grinding, good hand feel lubricating oil, abrasive dust less, friction-free, if they feel the sand between your fingers like a larger sense of friction, it indicates that oil of impurities, can not be reused, should be replaced with new oil.
③ illumination method
On a clear day, the oil lifted with a screwdriver, a 45 degree angle with the horizontal. Control the sun, the situation observed oil droplets, in the light, can clearly see no wear debris in lubricating oil is good, can continue to function, if too much debris, replace the oil.
④ oil droplets marks method
Take a clean sheet of white filter strips, drip a few drops in the filter strip, and to be oil leakage, if the surface of black powder, astringent touch with a sense of resistance, then the impurity inside the lubricating oil has a lot of good oil-free powder, hand feels dry and smooth, and yellow marks.
 



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