In normal use, the vibration of the bearing is very sensitive to the damage, spalling, indentation, corrosion, crack, wear, etc. will be reflected in the bearing vibration measurement. Therefore, the vibration can be measured by using a special bearing vibration measurer (Frequency analyzer, etc.), which can deduce the specific condition of the anomaly through the frequency distribution. The measured values are different depending on the condition of the bearing or the location of the sensor, so it is necessary to analyze and compare the measured value of each machine beforehand to determine the judging criteria.
High temperature often indicates that cylindrical roller bearings are in abnormal condition. High temperatures are also detrimental to the lubricants of bearings. Sometimes the bearing overheating can be attributed to the lubricant of the bearing. If the bearings in more than 125 ℃ temperature for a long time to reduce the bearing life. Causes of high temperature bearing include: insufficient lubrication or excessive lubrication, bearing raceway contains impurities, extreme speed is too high, bearing long-term overload operation.