According to the change of bearing grease color determine bearing running state

Judged by the color of the grease bearing operation is normal, the more difficult. Because of different internal grease additives is different, different running conditions, to adapt to the different temperature range, there can be no unified standard. Even the same kind of grease, also may be due to the production batch is different, a slightly different formula, and the difference of color. Therefore, in order to change color as a basis for may vary. In addition, even if not in bearing grease, would become angry. This is because the grease oxidation problems. Grease is placed ( Or run) A period of time, and come into contact with air. At the same time, metals ( Bearing itself and the bearing chamber and other related parts) Also acted as a catalyst in the oxidation reaction of role. Although there are a lot of grease have antioxidant additive, but only to reduce the speed of oxidation, so the color of the grease will always change. If the bearing runs abnormally, or entering foreign matter will cause such as grease performance and color change. If the temperature is higher, grease will accelerate oxidation, until the carbonized into carbon black color. Reason: the bearing itself or the change of environmental temperature, will lead to the grease base oil constantly in and out of the thickener, every time base oil back at the same time, is not necessarily completely back. This time is long, fat performance will change, will not be able to satisfy the lubrication. Base oil shortage of grease, the color may change. The higher the temperature, the greater the performance change of grease, its color changes will lead to greater. If the temperature is very high, carbide, namely become dark brown. If the bearing into the foreign body, including the bearing wear or foreign body itself and the friction between shaft and bearing chamber of scrap metal, will then become a grease and foreign body close to or even the same color. Into water or other liquid, its color will generally becomes shallow, sometimes become foamy or flocculent.