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In the past, single row tapered roller or ball bearings were mostly used in pairs for wheel hub bearings of automobiles. With the development of technology, car hub units have been widely used in cars. The application scope and amount 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. The second generation has a flange for fixing the bearing on the outer raceway, which can simply sleeve the bearing onto the axle and fix it with nuts. It makes the maintenance of the car easier. The third generation wheel hub bearing unit adopts the combination of bearing unit and anti lock brake system ABS. The hub unit is designed with an inner flange and an outer flange. The inner flange is bolted to the drive shaft, and the outer flange installs the whole bearing together. Worn or damaged hub bearings or hub units will cause inappropriate and costly failure of your vehicle on the road, and even cause damage to your safety. Please pay attention to the following matters in the use and installation of hub bearing: 1. In order to ensure safety and reliability to the greatest extent, it is recommended that you always check the wheel hub bearing no matter how old the vehicle is - pay attention to the early warning signal of bearing wear: including any friction noise during rotation or abnormal deceleration of the suspended combination wheel during turning. For rear wheel drive vehicles, it is recommended to lubricate the front wheel hub bearing when the vehicle is driven to 38000 km. When replacing the brake system, 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 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 the noise in the bearing is confirmed, the bearing may be damaged and need to be replaced. 3. Because the working conditions of the front hub leading to the failure of bearings on both sides are similar, even if only one bearing is broken, it is recommended to replace it in pairs. 4. The hub bearing is sensitive, so it is necessary to adopt the correct method and appropriate tools in any case. During storage, transportation and installation, the components of the bearing shall not be damaged. Some bearings need large pressure to press in, so special tools are needed. Be sure to refer to the automobile manufacturing instructions. 5. The bearing should be installed in a clean and tidy environment. Small particles entering the bearing will also shorten the service life of the bearing. It is very important to maintain a clean environment when replacing bearings. It is not allowed to knock the bearing with a hammer, and pay attention not to drop the bearing on the ground (or similar improper treatment). Before installation, the condition of the shaft and bearing seat should also be checked. Even slight wear will lead to poor fit, resulting in 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 the sealing ring will be damaged and water or dust will enter. Even the raceways of the sealing ring and inner ring are damaged, resulting in permanent failure of the bearing. 7. There is a magnetic thrust ring in the sealing ring equipped with ABS device bearing, which cannot be impacted, impacted or collided with other magnetic fields. Before installation, take them out of the packaging box and keep them away from the magnetic field, such as the motor or electric tool used. When installing these bearings, observe the ABS alarm pin on the instrument panel through road condition test to change the operation of the bearings. 8. For the hub bearing equipped with ABS magnetic thrust ring, in order to determine which side the thrust ring is installed on, you can use a light and small thing * close to the edge of the bearing, and the magnetic force generated by the bearing will attract it. During installation, point the side with magnetic thrust ring inward, facing the sensitive element of ABS. Note: incorrect installation may cause the function of the brake system to fail. 9. Many bearings are sealed, and this kind of bearings do not need to be greased in the whole service life. 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 cavity of the bearing, it is difficult to determine how much grease to add. The most important thing is to ensure that there is grease in the bearing. If there is too much grease, the excess grease will seep out when the bearing rotates. General experience: during installation, the total amount of grease should account for 50% of the bearing clearance. 10. When installing the lock n