The most of the wheel bearings of a car used to be a pair of single row tapered rollers or ball bearings. With the development of technology, car hub unit has been widely used in cars. The use and use of hub bearing units are increasing, and now it has developed to the third generation: the first generation is composed of double row angular contact bearings. In the second generation, there is a flange for fixing the bearing on the outer raceway. The bearing is simply fixed to the axle by the nut. It makes the maintenance of the car easy. The third generation hub bearing unit is used to match the bearing unit and the anti lock brake system. The hub unit is designed to have an inner flange and an outer flange. The inner flange is bolted to the drive shaft, and the outer flange is installed together.
Worn or damaged hub bearings or hub units will cause unsuitable and costly failure of your vehicle and even cause damage to your safety.
In the use and installation of hub bearings, please pay attention to the following items:
1, in order to maximize the safety and reliability, no matter how long they suggest you should always check the age of car hub bearing - bearing is early warning signal: including any wear friction noise when rotating or hanging combination wheel when cornering speed is not normal.
The rear wheel drive vehicle suggests that the vehicle should lubricate the front wheel bearing at 38000 kilometers. When the brake system is replaced, check the bearing and replace the oil seal.
2. If you hear the noise from the hub bearing, first of all, it is important to find the location of the noise. There are many moving parts that may produce noise, or some of the rotates are in contact with the non - rotating parts. If the confirmation is the noise in the bearing, the bearing may have been damaged and need to be replaced.
3, because the front wheel hub causes both sides of the bearing failure of the working conditions are similar, so even if only a bearing is broken, it is suggested that the pair replace.
4, the hub bearing is more sensitive, and in any case the correct method and appropriate tools are needed. In the process of storage, transportation and installation, the parts of the bearing can not be damaged. Some bearings require greater pressure pressure, so special tools are needed. Be sure to refer to the automobile manufacturing instructions.
5, the installation of bearings should be in a clean and tidy environment, small particles into the bearing will also shorten the life of the bearing. It is very important to maintain a clean environment when replacing the bearings. Do not allow the use of percussion hammer bearing, bearing attention do not fall on the ground (or similar misconduct). The condition of shaft and bearing seat should also be checked before installation, even small wear and tear will lead to bad fit, which causes early failure of bearing.
6, for hub bearing units, do not attempt to open up the hub bearing or adjust the sealing ring of the hub unit, otherwise, the sealing ring will be damaged, leading to the entry of water or dust. Even the seal ring and the raceway of the inner ring are damaged, causing permanent failure of the bearing.
7. There is a magnetic thrust ring in the sealing ring equipped with the bearing of the ABS device, which can not be collided, impacted or collided with other magnetic fields. Remove from the box before installation and keep them away from the magnetic field, such as the motor or electric tools used. When these bearings are installed, the ABS alarm pin on the dashboard is observed through the road condition test to change the operation of the bearing.
8, the hub bearing with ABS magnetic thrust ring. In order to determine which side of the thrust ring is mounted, we can use a light thing near the edge of the bearing, and the magnetic force generated by the bearing will attract it. At the time of installation, the magnetic thrust ring will be directed to the inside and the sensitive element of the ABS. Note: incorrect installation may result in the failure of the brake system.
9. Many bearings are sealed, and this kind of bearing does not need to add grease for the whole life period. Other unsealed bearings, such as double row tapered roller bearings, must be lubricated by grease for installation. Because the size of the bearing cavity is different, it is difficult to determine how much oil is added. The most important thing is to ensure that there is grease in the bearing. If the grease is too much, when the bearing rotates, the excess grease will exudate. General experience: in the installation, the total amount of oil should account for 50% of the clearance of the bearing. 10. When the lock nut is installed, the size of the torque is very different because of the difference between the bearing type and the bearing seat.
