Wheel hub bearing installation and use common sense
In the past, most of the wheel hub bearings of cars used single row tapered roller or ball bearings in pairs. With the development of technology, car wheel hub units have been widely used in cars. The range and usage of wheel hub bearing units are increasing day by day, and it has now developed to the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange on the outer raceway for fixing the bearing, and the bearing can be simply sleeved on the axle and fixed with a nut. Makes car maintenance easier. The third-generation wheel hub bearing unit is a combination of the bearing unit and the anti-lock brake system. 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 mounts the entire bearing together. Worn or damaged hub bearings or hub units can cause undue and costly failure of your vehicle on the road, or even harm your safety. In the use and installation of wheel hub bearings, please pay attention to the following matters: 1. In order to ensure maximum safety and reliability, it is recommended that you always check the wheel hub bearings regardless of the age of the vehicle - pay attention to the early warning of whether the bearings are worn Signals: Include any friction noise when turning or abnormal deceleration of the suspension combination wheel when cornering. For rear-wheel drive vehicles, it is recommended that the front wheel hub bearings should be lubricated when the vehicle travels to 38,000 kilometers. When replacing the brake system, check the bearings and replace the oil seal. 2. If you hear the noise from the hub bearing, first of all, it is important to find the place where the noise occurs. There are many moving parts that may produce noise, and it may also be that some rotating parts are in contact with non-rotating parts. If it is confirmed that it is the noise in the bearing, the bearing may be damaged and needs to be replaced. 3. Because the working conditions of the front hub causing the failure of the 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 more sensitive, and in any case, the correct method and suitable tools need to be used. In the process of storage, transportation and installation, the parts of the bearing cannot be damaged. Some bearings require greater pressure to be pressed in, so special tools are required. Be sure to refer to the car manufacturer's manual. 5. When installing the bearing, it should be in a clean and tidy environment. The entry of fine particles into 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 hit the bearing with a hammer, and be careful not to drop the bearing on the ground (or similar mishandling). The condition of the shaft and bearing housing should also be checked before installation, as even a small amount of wear can lead to poor fit, which can lead to 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 the ABS device bearing, which cannot be collided with, impacted or collided with other magnetic fields. Take them out of the box before installation and keep them away from magnetic fields, such as motors or power tools in use. When installing these bearings, change the operation of the bearings by observing the ABS alarm needle on the instrument panel through a road test. 8. For the hub bearing equipped with ABS magnetic thrust ring, in order to determine which side the thrust ring is installed on, a small object can be used to approach the edge of the bearing, and the magnetic force generated by the bearing will attract it. When installing, point the side with the magnetic thrust ring inward, facing the sensitive element of the ABS. NOTE: Improper installation may result in the malfunction of the brake system. 9. Many bearings are sealed, and these bearings do not need to be greased throughout their 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, when the bearing rotates, the excess grease will seep out. General experience: During installation, the total amount of grease should account for 50% of the bearing clearance. 10. When installing the lock nut, the torque varies greatly due to the different bearing types and bearing seats. Pay attention to the relevant instructions.