6.5.2 Causes:6.5.2.1 The lubricating oil temperature is too high, or the pressure is too low, or the oil isnot qualified.6.5.2.2 The oil of bearing is cut off or the oil volume is too small due to the blocking of oilpipes at the inlet and outlet of booster fan bearing.6.5.2.3 Dynamic and static abrasion or bearing overload occurs on the bearing.6.5.2.4 The vibration is too large for a long time, thus causing damage to bearing bush.
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