Cleaning, Maintenance and Judgment of Bearing

Bearing cleaning

When disassembling the lower bearing for maintenance, first record the appearance of the, confirm the residual amount of lubricant, and wash after sampling the lubricant for inspection.

As cleaning agents, gasoline and kerosene are commonly used. The disassembled cleaning can be divided into rough cleaning and fine cleaning. Place metal mesh pads on the bottom of the container separately so that it does not directly contact the dirt of the container.
During rough cleaning, if it is rotated with dirt, it will damage the rolling surface of the bearing, so attention should be paid. In coarse cleaning oil, use a brush to remove grease and buildup. After a rough sweep, perform a fine sweep. Fine cleaning is to wash carefully while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.

Maintain Judgment of Bearing

In order to judge whether the disassembled parts can be used again, it is necessary to check after cleaning, carefully check the state of the raceway surface, rolling surface and mating surface, the wear of the cage, the increase of the bearing clearance, and whether there is any discrepancy with the size Decreased accuracy related to damage and anomalies.
For non-separable small balls, use one hand to support the inner ring horizontally, and turn the outer ring to confirm whether it is smooth. Tapered roller bearings and other separable bearings can check the rolling body and the raceway surface of the outer ring separately.
Since it cannot be turned by hand, pay attention to the appearance of rolling elements, raceways, cages and retaining surfaces. The higher the importance of the bearing, the more careful the inspection.

The judgment of whether it can be reused is based on the degree of damage, mechanical properties, importance, operating conditions and time until the next maintenance. But if it has the following defects, it can no longer be used and must be replaced with a new clean bearing:

Cracks or gaps in any of the inner ring, outer ring, rolling elements and cage;
Any one of the rings and rolling elements is damaged;
The raceway surface, ribs and rolling elements are obviously stuck;
The cage is obviously worn or the rivets are obviously loose;
The raceway surface and rolling elements are corroded and damaged;
There are severe indentations and indentations on the raceway surfaces and rolling elements;
There is obvious creep on the inner diameter surface of the inner ring or the outer diameter surface of the outer ring;
Visible discoloration caused by heat exposure
Oil seal or wiper seal is visibly damaged.

Bearings are important mechanical basic components and are widely used in various fields of national economy and national defense. Machinery and working environments vary widely, and special attention should be paid to the maintenance of precision parts with high dimensional accuracy to increase their service life.
If it is installed improperly, it will lose its due precision and performance, and even cause failure in severe cases. Therefore, the installation site and installation tools must be clean to prevent the entry of various particles
When installing and disassembling, do not hit directly with a hammer, but use even force. When the interference between the shaft and the shaft is large, it should be installed immediately after heating

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