In the past, single row tapered roller or ball bearings were commonly used in pairs for the wheel hub bearings of sedans. With the development of technology, sedan wheel hub units have been widely used in cars. The scope and usage of hub bearing units are increasing day by day, and they have now developed to the third generation: the advanced generation is composed of double row angular contact bearings. The second generation has a flange on the outer raceway for fixing the bearing, which can be easily fitted onto the axle and secured with a nut. Make car maintenance easier. The third generation wheel hub bearing unit adopts a combination of bearing units and anti lock brake system ABS. The hub unit is designed with an inner flange and an outer flange. The inner flange is fixed to the drive shaft with bolts, and the outer flange installs the entire bearing together. Worn or damaged hub bearings or hub units can cause your vehicle to experience unsuitable and costly failures during driving, and even harm your safety. Please note the following when using and installing hub bearings:

1. To ensure maximum safety and reliability, it is recommended that you regularly check the wheel hub bearings regardless of the age of the vehicle - pay attention to early warning signals for bearing wear, including any frictional 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 wheel hub bearings before driving up to 38000 kilometers. When replacing the brake system, check the bearings and replace the oil seals.

2. If you hear any noise coming from the hub bearing area, it is important to first locate the location where the noise occurs. There are many moving parts that may produce noise, or some rotating parts may come into contact with non rotating parts. If it is confirmed that there is noise in the bearing, the bearing may be damaged and needs to be replaced.

3. Due to the similar working conditions of the front wheel hub causing bearing failure on both sides, even if only one bearing is damaged, it is recommended to replace it in pairs.

4. Hub bearings are sensitive and require the correct method and appropriate tools in any situation. During storage, transportation, and installation, the components of the bearings must not be damaged. Some bearings require significant pressure to be pressed in, so special tools are needed. Be sure to refer to the car manufacturing manual.

5. When installing bearings, they should be in a clean and tidy environment. Small particles entering the bearings can also shorten their service life. It is very important to maintain a clean environment when replacing bearings. It is not allowed to hit the bearing with a hammer, and be careful not to drop the bearing on the ground (or handle it improperly). Before installation, the condition of the shaft and bearing seat should also be checked. Even minor wear can lead to poor fit, resulting in early bearing failure.

6. Do not attempt to disassemble the hub bearing unit or adjust the sealing ring of the hub unit, otherwise it may damage the sealing ring and cause water or dust to enter. Even the sealing ring and inner race raceway are damaged, causing long-term bearing failure.

7. The sealing ring equipped with ABS device bearings has a magnetic thrust ring inside, which cannot be subjected to collision, impact, or collision with other magnetic fields. Remove them from the packaging box before installation and keep them away from magnetic fields, such as electric motors or tools used. When installing these bearings, observe the ABS warning pin on the dashboard through road condition testing to change the operation of the bearings.

8. For hub bearings equipped with ABS magnetic thrust rings, in order to determine which side the thrust ring is installed on, a lightweight object can be used to approach the edge of the bearing, and the magnetic force generated by the bearing will attract it. During installation, point the side with the magnetic thrust ring inward, facing the sensitive components of ABS. Attention: Incorrect installation may cause the brake system to malfunction.

9. Many bearings are sealed and do not require lubricating grease throughout their entire lifespan. Other unsealed bearings, such as double row tapered roller bearings, must be lubricated with grease during installation. Due to the different sizes of the inner chambers of bearings, it is difficult to determine how much grease to add. It is more important to ensure that there is grease in the bearings. If there is too much grease, excess grease will seep out when the bearings rotate. General experience: During installation, the total amount of grease should account for 50% of the bearing clearance. 10. When installing the locking nut, the torque varies greatly due to the different types of bearings and bearing seats.