Not by removing check, bearings can be identified or predicted which in operation have failure or not, it is very important to improve the productivity and economy. The main methods are as follows:

1. Through the sound identification

It is necessary to have a wealth of experience to identify through the sound, and it must be have fully trained to recognize the sound of bearings and no sounds of bearings.

To this end, it should be send out a specially-assigned person to carry out this work. To use a listening device or a microphone which can attached to the bearing’s shell,then can hear the sound from the bearing clearly.

2. Identification by operating temperature

The method belongs to the object recognition method, which is only used in the situation where the running state is not changed. To this end, a continuous record of temperature must be carried out.

When a fault occurs, the temperature will not only rise up, but also irregular changes.

It is advisable to use this method and the method of sound identification together.

3. Through the state of the lubricants to identification

Make a sampling analysis of lubricant, to judge through its pollution level, whether mixed with foreign body or metal powder.

The method for can't close to the observed of the bearings or large bearings are particularly effective.