Frequently check the oil supply of the bearing. If there is oil leakage in the box, you can tighten the bolts of the end cover a little bit. If this is not enough, you may have to replace it with a new seal packing. The lubricating oil of the bearing should be replaced at least once in six months during normal use. For the first use , it should be carried out after about 200 hours of operation. The second oil change should be carried out within 1 to 2 months. The lubricating oil should be checked once a week. If the lubricating oil has not deteriorated, the oil change can be extended to once every 2 to 4 months. When changing, you must use the specified brand of lubricating oil, and the old oil in the oil tank must be thoroughly drained and cleaned before filling with new oil. If you want to replace the fan bearing, you should pay attention to the following: Before installing the new bearing, the bearing and the bearing box must be very clean. Put the bearing in the oil with a temperature of about 70 ~ 80 ℃ and heat it before installing it on the shaft. Do not force the assembly to avoid damage to the shaft.