Use the bearings installed after the installation in order to check the correct operation check to. Small machinery can be rotated by hand to confirm whether or not to rotate smoothly. Nick, indentation inspection items dysfunctional due to poor installation, poor mount processing the torque generated by instability, the clearance is too small, the installation error, excessive seal friction torque and so on. If no abnormal power operation can begin.
Large machinery can not be manually rotated, so the load to start immediately after the power is shut down, mechanically idling check vibration, noise, whether the rotary member in contact with, etc., to confirm no abnormality, into the power running.
Power operation, from the no-load low speed, slowly increased to the rated operation of the conditions set forth. Commissioning checks matters, whether there are abnormal audio, changes in temperature, the leakage of the lubricant or discoloration. If abnormal, should immediately suspend the operation, inspection machinery necessary to remove the bearing checking.
Bearing temperature is generally speculated that according to the external temperature of the bearing. However, the use of the hole direct measurement of the bearing outer ring temperature is more accurate. The bearing temperature, and gradually increased from the start of the operation, usually 1 to 2 hours after the temperature stabilized. If the bearing is installed adverse temperature will soar, and abnormally high temperatures. The reason lubricant such as excessive bearing clearance is too small, poor installation, sealing device friction is too large. Speed rotation of the case, a bearing structure, lubrication selection error is its cause.
Abnormal bearing rotation with a stethoscope to check, there is a strong metal noise, abnormal sound, irregular sound shows. The reason for poor lubrication, shaft or bad bearing accuracy, bearing damage, foreign invasion.
Bearing the following common faults:
 1 watt surface corrosion: spectra showed abnormal concentration of non-ferrous metal elements; iron spectrum submicron wear particles of many non-ferrous metal components; lubricants excessive moisture, acid value exceeded.
 Journal surface strain: Ferrography, cutting abrasive or black oxide particles of iron-based metal surface tempering color.
 Journal surface corrosion: spectra showed abnormal concentration of iron, iron spectrum the many iron components submicron particles, lubricants excessive moisture or acid value exceeded.
 4, the surface strain: Ferrography in cutting abrasive, abrasive ingredients for non-ferrous metals.
 5, tile back fretting wear: spectra showed abnormal iron concentration, the many iron content in the sub-micron wear particles in the iron spectrum, lubricants moisture and acid abnormalities.
Liquid lubrication conditions, the sliding surface lubricants separate without direct contact, can also greatly reduce friction loss and surface wear, the film also has a certain vibration absorption capacity


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