How to make clear the noise 220V Cooling Fan?

"220V Cooling Fan" transport the most important parts is bearing a long time the lack of oil, will generate noise such high-speed rotation. Therefore, we only need a few drops on the fan bearing lubricant, sewing machine if you do not use can be replaced. But be careful do not use oil instead, because of its relatively large particles, easy to damage the bearings. Vibration noise is also a "220V Cooling Fan" an important part of the noise, because the leaves loose in the bearing and bearing wear resulting in the gap becomes larger and so on, so only need to remove the sub-sector, the screws tight button, so firmly fixed after , it will not shake. In addition the use of poor quality cooling fan, in the production of this type of fan due to defects in workmanship, the center of gravity may not be in the blades on the axis, the formation of "eccentric" and use over time, a fan of "eccentric" phenomenon becoming more and more serious, it will not only produce noise, serious damage may also CPU. In this regard, can be removed altogether, and then thread hanging from its center position, let it sink still to see which direction to put an end to sink in light grinding wheel a few times, and then tested, has been be "220V Cooling Fan" in a horizontal position and then later be able to install up to.