How to Choose Slewing Bearing Grease?


When the slewing bearing is working, it is necessary to use grease to lubricate the bearing, which can reduce the friction coefficient of the bearing and reduce the energy loss during the operation of the bearing, thereby ensuring the mechanical accuracy and also the main method to extend the life of the bearing. In order to make the bearing lubrication effect better, the choice of slewing bearing grease is very important. So what factors should be considered when choosing lubricating grease?

slewing bearing grease

The type of slewing bearing grease

The consistency and lubricating ability of the grease are affected by the operating temperature. Bearings operating at a certain temperature must choose a grease with the correct consistency and good lubricating effect at the same temperature. They are classified according to their allowable operating temperature. Grease can be roughly divided into low-temperature, medium-temperature, and high-temperature grease.

The viscosity of grease

The base oil viscosity of grease is mainly affected by temperature. It decreases as the temperature increases, and it increases when the temperature decreases. Therefore, it is necessary to know the base oil viscosity at operating temperature. Machinery manufacturers usually specify the use of a certain grease, but most standard greases are suitable for a wide range.

Anti-rust performance

The grease used in the slewing bearing must have an anti-rust effect, and the anti-rust agent cannot dissolve in water. Grease should have good adhesion and can form an oil film on the surface of the steel.

Mechanical stability of slewing bearing grease

Grease becomes soft during machining, which may cause leakage. During normal operation, the grease will be thrown into the bearing from the bearing seat. If the mechanical stability of the grease is not enough, the structure of the grease will be mechanically disintegrated during operation, causing the grease to be destroyed and thus losing its lubricating effect.

Sealing for slewing bearing

Sealing is a necessary barrier to protect the bearing and lubricant from external contamination. During the operation of the bearing, no debris or moisture can penetrate into the bearing to prevent damage to it. Correct installation and maintenance is an important factor for the long service life of slewing bearings.

At the same time, attention must be paid to the cleanliness of the bearing, the correctness of the bearing selection, and the selection of appropriate installation and maintenance tools. In addition, the bearings must be protected from contaminants and moisture, and they must be installed and lubricated correctly. Therefore, the design of the bearing arrangement, the condition of the oil seal, the type of lubricant, and the lubrication cycle, and even the special maintenance all play the same and important role.

Mixed grease is not allowed

Never mix incompatible greases in a slewing ring bearing. If two incompatible greases are mixed, their consistency will usually become soft, which may cause damage to the bearing due to the easy loss of grease. If you do not know which kind of grease the bearing originally used, you must thoroughly remove the old grease inside and outside the bearing before adding new grease.

The above is a detailed explanation of what issues should be considered when selecting slewing bearing grease. In addition, it should be noted that when adding grease, if the amount of grease is too large, the friction torque will increase, and the temperature will rise, the grease leakage will occur. However, if the amount of grease is too small, reliable lubrication cannot be obtained and dry friction occurs. Therefore, the amount of grease is also very critical. Learn how to lubricate slewing bearings.