Wheel hub bearings used to be used most in pairs of single row tapered roller or ball bearings. With the development of technology, car wheel hub unit has been widely used. The use range and usage of hub bearing unit is growing day by day, and it has developed to the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange for fixing the bearing on the outer raceway, and can simply put the bearing sleeve on the axle and fix it with a nut. It makes car maintenance easier. The third generation of hub bearing unit is the use of bearing unit and anti-lock brake system ABS coordination. The hub unit is designed to have an inner flange and an outer flange, with the inner flange bolted to the drive shaft and the outer flange fitting the entire bearing together. Worn or damaged hub bearings or hub units can cause inappropriate and costly failures of your vehicle on the road, or even harm your safety. Please pay attention to the following points in the use and installation of hub bearings:
1. In order to ensure maximum safety and reliability, it is recommended that you always check hub bearings no matter how old the vehicle is - watch for early warning signs of bearing wear, including any friction noise during rotation or abnormal deceleration of the suspension combination wheel during turns. For rear-wheel drive vehicles it is recommended to lubricate the front hub bearings until the vehicle has travelled 38,000 km. When replacing the brake system, check the bearing and replace the oil seal.
2. If you hear the noise from the hub bearing part, first of all, it is important to find the location where the noise occurs. There are many moving parts that may produce noise, and there may be some rotating parts in contact with non-rotating parts. If it is confirmed that it is noise in the bearing, the bearing may have been damaged and needs to be replaced.
3. Because the working conditions of the front hub leading to the failure of bearings on both sides are similar, it is recommended to replace them in pairs even if only one bearing is broken.
4. Hub bearings are more sensitive, in any case need to use the right method and appropriate tools. In the process of storage, transportation and installation, bearing components can not be damaged. Some bearings need greater pressure to be pressed into, so special tools are needed. Always refer to the car's manufacturing instructions.
5. When installing bearings, they should be in a clean and tidy environment. Fine particles entering bearings will also shorten the service life of bearings. It is very important to keep a clean environment when replacing bearings. Hammer is not allowed to hit the bearing, take care that the bearing does not fall to the ground (or similar mishandling). Before installation, the condition of the shaft and bearing seat should also be checked, even small wear will lead to poor fit, resulting in the early failure of the bearing.
6. For the hub bearing unit, do not attempt to disassemble the hub bearing or adjust the sealing ring of the hub unit, otherwise it will damage the sealing ring and lead to the entry of water or dust. Even the sealing ring and inner ring raceway are damaged, resulting in permanent bearing failure.
7. There is a magnetic thrust ring in the sealing ring equipped with the bearing of ABS device. This thrust ring cannot be collided, impacted or collided with other magnetic fields. Take them out of the box before installation and keep them away from magnetic fields, such as electric motors or power tools used. When installing these bearings, the operation of the bearings is changed by observing the ABS alarm pin on the instrument panel through the road condition test.
8. Hub bearings equipped with ABS magnetic thrust ring, in order to determine which side the thrust ring is installed, you can use a light and small thing * near the edge of the bearing, the magnetic force generated by the bearing will attract it. When mounting, the side with the magnetic thrust ring is pointed inward, directly against the ABS sensor. Note: Incorrect installation may result in functional failure of the brake system.
9. Many bearings are sealed, this kind of bearings in the whole life is not the need to add grease. Other unsealed bearings such as double row tapered roller bearings must be lubricated when installed. Because of the different size of the bearing cavity, it is difficult to determine how much oil to add. The most important thing is to ensure that there is oil in the bearing. If there is too much oil, when the bearing rotates, the excess oil will seep out. General rule of thumb: When installing, the total amount of grease should account for 50% of the clearance of the bearing.
10. When installing the lock nut, the torque varies greatly due to the difference of bearing type and bearing seat. Refer to the instructions.
2023-03-28