Remove the power supply from the host and take out the four fixing screws on the back of the power supply as shown below.

Open the upper cover of the power supply.

Remove the fan The screws fixed on the power supply casing.

Carefully take out the fan, lay it flat, and then tear off the paper in the middle.

There is also a protective pad on the paper. Now you can see the center of the bearing of the fan.

Add machine lubricating oil (preferably sewing machine oil), drop a little oil in the middle of the bearing, move the fan blades with your fingers, and turn the fan to let the oil dissolve , when the lubricating oil is almost dissolved, turn the fan over, turn the fan over again, and install the protective pad to block the oil from leaking out. Then put the sticker in place, and the refueling work is completed.