"220V Cooling Fan" using the phenomenon appeared difficult to start the year, indicating that the quality of the fans is not very good. The main reason is that start-up difficulties inside the rotor shaft lubrication economy dried up, and there are a lot of coke between the rotor shaft and sleeve, so that the friction between the rotor shaft and the bushing increases caused. Then you can carefully put "220V Cooling Fan" was removed from the rotor blades, after removing the fan shroud, the fan motor is removed and decomposed motor, after the rotor shaft Rub it with muslin cloth, representing Thick soot available tools carefully removed. Bushings are made of copper, not too hard when you remove coke not available sharp knives, should be removed with a wooden things, such as wood strips. Clear "220V Cooling Fan" coke after adding a little bit of good quality lubricating oil can.