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Car wheel bearings are the most in the past paired single row tapered roller bearing or ball bearing. With the development of technology, the car has a wide range of used car hub units. Wheel hub bearing and use the range of use is growing, has now reached its third generation: first generation is made up of double row angular contact ball bearings. Second generation on the outer roller for attaching the bearing flange, easy to secure SKF wheel bearing nut on. Car maintenance becomes easier. Third-generation wheel hub bearing is a bearing unit and tie in anti-lock brake system ABS. Hub unit designed as inner flange and the outer flange, inner flange on the drive shaft with bolt, outer flange bearing mounted together as a whole. Worn or damaged wheel hub bearing or wheel hub may make your vehicle in a moving way inappropriate and costly failure, or even cause harm to your security.
Wheel bearings in the use and installation of your attention to the following matters:
1, for maximum security and reliability, we recommend that you no matter how long the old to always check the wheel bearings-the attention to the early warning signals of the bearing wear: includes any combination of friction noise when turning or flying wheels turning without the normal slowdown. Vehicles are rear-wheel drive vehicle is recommended to 38,000 km is the front wheel hub bearing should be lubricated. When replacing the brake system, check the bearing and replace the oil seal.
2, heard the noise wheel bearing parts issued, first of all, it is important to find where the noise occurs. There are many moving parts that may produce noise, also could be turned with the contact does not rotate. If it recognizes is a bearing noise, SKF bearings may be damaged and should be replaced.
3, because the front wheels lead to bearing failure on both sides working conditions similar, so even if a bearing is bad, it is also recommended to replace.
4, wheel hub bearings are more sensitive, in any case, need to adopt the right approach and the right tools. In the storage, transport and installation process, not to damage bearing parts. SKF bearings require more pressure into, so you will need special tools. Certain reference to the vehicle manufacturer's instructions.
5, install the bearing should be in an environment that is clean, small particles into the bearing will shorten the service life of the bearing. When replacing the bearings is very important in maintaining a clean environment. Do not allow tapping with a hammer bearing, note the bearings do not fall on the ground (or similar misconduct). Installation shafts and housings shall also check the status of, even if it is minor wear and tear can lead to poor fit, thus giving rise to early failure of SKF bearings.
6, wheel hub bearing unit, do not attempt to disassemble the wheel hub bearings or adjusting the wheel seal, as this will prevent seal damage caused to water or dust from entering. Even ring raceway and inner ring are damaged, resulting in the permanent failure of the bearing.
7, equipped with ABS devices magnetic thrust bearings are sealed inside a ring, kind of thrust rings cannot be a collision, the impact of or collide with another magnetic field. From the packaging before installation out of the box, keep them away from the magnetic field, such as the use of electric motors or power tools. When you install these bearings, pass the road test observation on the dashboard ABS alert PIN to change the bearing operation.
8, fitted with ABS magnetic wheel bearing thrust ring, in order to determine the thrust ring mounted on which side you can light with a small edge close to the bearing, the magnetic bearing will be attracted to it. Install magnetic thrust side pointing to the inside of the ring opposite the ABS sensor. Note: incorrect installation may cause failure of the braking system.
9, many of SKF bearings are sealed, this type of bearing is not required to install grease throughout their life. Other sealed bearings double row tapered roller bearing must be grease-lubricated when it was installed. Due to the different cavity size for the bearing, it is difficult to determine how much oil, the most important thing is to guarantee the grease in the bearings, if too much oil when the bearing rotates, excess oil seeps. A general rule of thumb: at the time of installation, total amount of grease to the bearing clearance of 50%.
When installing the lock nut 10, due to the different type SKF bearings and bearing housings, torque varies greatly in size. Reference for instructions.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 32222U NTN | 110 | 200 | 53 |
| 30222U NTN | 110 | 200 | 38 |