1. Bearing problems:

The oil bearing used by some cooling fans is porous. This kind of bearing has been used for a long time, and the lubricating oil in the bearing sleeve is easy to leak out, which will increase the noise, and will pollute and other accessories. The bearing is easy to wear out and has a short service life.

2. Lubricating oil problems:

The main reason for the oil leakage of the cooling fan is that the lubricating oil is added too much, resulting in overflow. In addition, if the lubricating oil used is too low, poor quality, and low viscosity, it is easy to throw oil when the fan is running.

3. Sealing problems

The cooling fan cover is usually sealed with a label to prevent oil spillage and leakage. Therefore, after removing the label and adding lubricating oil, the label is not pasted again, or the label is not sticky enough, which may lead to oil spillage and oil leakage of the cooling fan.