The cause of bearing heating may be:

　　1. Rolling bearings: Insufficient lubrication of the bearing; the location (shaft or hole) where the bearing is installed is different from the shaft; the selection of the bearing model is improper, etc.

　　2. Sliding bearing: insufficient lubrication of the bearing; improper matching seat of the bearing; improper selection of the bearing pair material; excessive pv value of the bearing pair, etc.

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