Abnormal bearing temperature increase Cause 1: too much lubricant, countermeasures: to reduce the lubricant, the amount of use, choose a harder grease. Cause 2: Insufficient or unsuitable lubricant, countermeasure: add lubricant, select the appropriate lubricant. Reason 3: abnormal load, countermeasures: modify with the study of bearing clearance, adjust the preload, modify the shell shoulder position. Reason 4: bad installation, countermeasures: to improve the machining accuracy of the shaft and housing, installation accuracy, installation methods. Reason 5: With the surface of the creep, the sealing device friction is too large, countermeasures: replacement of bearings, research cooperation, modify the shaft and the shell, change the seal form.