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When is the better time to change the bearing oil

Writer: Eric Bearing Limited

As everyone knows, grease plays a very important role in the use of bearings. Then someone will ask, is it possible to use grease to lubricate bearings indefinitely? When and how much oil should be changed? In fact, these problems are complicated problems of bearing maintenance technology.

To the question of whether grease can be used indefinitely, the affirmative answer is no. Because excessive use of grease is harmful to bearings.


Grease has a good effect on bearings. It has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high temperature oxidation resistance, delay aging, dissolve carbon deposits, and prevent metal wear debris Agglomerate with oil and improve the wear resistance, pressure resistance and corrosion resistance of the machine.

However, the more grease is filled, the greater the friction torque. With the same filling amount, the friction torque of sealed bearings is greater than that of open bearings. After the grease filling amount is equivalent to 60% of the bearing internal space volume, the friction torque no longer increases significantly. This is because most of the grease in the open bearing has been squeezed out, and the grease in the sealed bearing has also leaked out.

With the increase of the grease filling, the temperature rise of the bearing increases linearly. The temperature rise of the sealed bearing is higher than that of the open bearing at the same filling amount. It is generally believed that the grease filling amount of sealed rolling bearings should not exceed about 50% of the internal space at most. ERIC BEARING LTD can supply SKF 22224 E bearings in rich stock , if you are interested , pls contact us . 

Generally speaking, the lubrication plan of the bearing is based on time. Equipment suppliers usually make lubrication plans based on operating hours. In addition, equipment suppliers often provide guidance on the amount of lubricant during their maintenance planning. For workers, it is very common to change lubricants in a short period of time, and more grease is often added.