Disassemble
1. Loosen the bolts that secure the bearing seat. Remove the imported German FAG bearing together with the bearing seat from the shaft. Note that before removing the German FAG bearing seat at one end of the shaft. The I bearing seat bolt at the other end of the shaft should be loosened to avoid damage to the bearings at both ends.
2. Loosen the locking screw on the eccentric sleeve of the German FAG bearing with an Allen key, then insert a small iron rod into the counterbore on the eccentric sleeve of the top cover, and loosen the eccentric sleeve against the direction of rotation of the shaft.
Many people use improper installation methods in the installation of bearings, resulting in damage to the German FAG bearings. So how to install the bearing correctly? I hope everyone has a more comprehensive understanding of bearing installation and disassembly:
For bearing rings with clearance fit, it is recommended to coat the mating surface with a thin layer of anti-creeping corrosion agent to prevent friction corrosion between the mating surfaces.
The 390000 series outer spherical bearing fixes the inner ring of the bearing with the shaft through an eccentric sleeve, and the hexagon socket screw on the eccentric sleeve plays a role of fastening. In the maintenance, many operators will not disassemble and assemble this kind of German FAG bearings, so it is necessary to introduce the technical points and precautions for disassembly and assembly of the 390000 series outer spherical bearings:
Correct installation is very important for the use of German FAG bearings. I hope you can use the correct installation method in future use.
When installing, you can choose mechanical, heating or hydraulic methods according to its type and size. The force exerted on the bearing during installation must not be transmitted from one bearing ring to another German FAG bearing ring through the rolling elements, otherwise it may cause damage to the raceway. But under any circumstances, it is not allowed to directly knock the bearing ring, cage, rolling element or seal.
3. Install eccentric sleeve. First put the eccentric sleeve on the eccentric step of the German FAG bearing inner sleeve, and tighten it by hand in the direction of rotation of the shaft. Then insert the small iron rod into or against the counterbore on the eccentric sleeve. Knock the small iron rod along the axis of rotation with a hand hammer. Install the eccentric sleeve firmly, and finally tighten the hexagon socket screws on the eccentric sleeve.
4. Do not tighten the bolts for fixing the German FAG bearing seat, but allow the bearing housing to rotate in the bearing seat. Then tighten the bearing seat bolts. Also install the bearing and seat on the other end of the same shaft, rotate the shaft a few times, and let the German FAG bearing automatically correct its position.
5. Apply lubricating oil on the mating surface of the bearing seat and the bearing, and install the German FAG bearing into the bearing seat. Then put the assembled bearing on the shaft together with the German FAG bearing seat. Push to the desired location for installation.
6. Before installing the German FAG bearing on the shaft, you must first unplug the fixing pin of the bearing housing, and at the same time polish the journal surface smoothly and cleanly, and apply oil to the journal to prevent rust and lubricate (allow the bearing to rotate slightly on the shaft).

maintainance
1. Clean the dust on the fan to prevent dust from entering the bearing during the installation process;
2. Tear off the sticker on the bearing seal and remove the pin on the shaft;
3. Wipe the residual oil in the bearing with a clean tissue or soft cloth, and then wipe the shaft;
4. Add a little butter to the bearing, the principle is to use less and not too much so as not to seriously affect the speed;
5. Cut off the aluminum skin of the can and cut a round piece as large as the outer diameter of the bearing bayonet pin, and dig a small hole in the middle that can just pass through the shaft, and pad it between the bearing and bayonet pin to reduce The distance that the small bearing moves axially and parallelly. If the gap is large, it is necessary to add a few thickening pads, so that the forward and backward movement distance of the bearing is less than 0.5mm;
6. Seal the oil seal, add a little butter, and finally install the fan back into the graphics card. Try it with the power supply, you will find that the sound is much smaller, and it can be used for at least 2 years. But it needs to be reminded that although the sound is lower, the speed will drop slightly because of the limited manual accuracy.