After adjustment shims "Micro Cooling Fan" big problem shaft axial clearance, you can choose disassemble the motor. But I remember back when the motor is installed, you must pay attention to the rotor and the bearing concentric, lubrication with screws diagonally and slowly tighten, and finally with wood to knock the shaft, make sure it concentric. Demolition "Micro Cooling Fan" motor is very easy, but more difficult to put back, do not casually, it will be very easy to repair bad fan. If you remove the "Micro Cooling Fan" serious motor bearing wear is found, it should be for a new part. If it is because of an electrical failure, you can check the wiring of the lines, sometimes damaged cord can repair issues.