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Worn or damaged hub bearings or hub units can cause inappropriate and costly failures of your vehicle on the road, and can even cause damage to your safety. In the use and installation of 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 bearing regardless of the age of the car - pay attention to whether the bearing has an early warning signal of wear and tear: including any friction noise during rotation or suspension of the combination wheel during turning Unusual deceleration.
For rear-wheel-drive vehicles, it is recommended that the front hub bearing be lubricated when the vehicle is driven to 38,000 kilometers. When replacing the brake system, check the bearing and replace the oil seal.
2. If you hear noise from the hub bearings, first of all, it is important to find where the noise occurs. There are many moving parts that may generate noise. It may also be that some rotating parts come into contact with non-rotating parts. If it is confirmed that the noise is 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 both sides of the bearing are similar, even if only one bearing is broken, it is recommended to replace it in pairs.
4. Hub bearings are sensitive and in any case need to use the right method and the right tool. During the storage and installation process, the bearing components cannot be damaged. Some bearings require a large pressure press, so special tools are required. Must 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 shorten the bearing life. It is very important to maintain a clean environment when replacing bearings. It is not permissible to tap the bearing with a boring head and note that the bearing should not fall to the ground (or something similarly handled improperly). The condition of the shaft and bearing housing should also be checked prior to installation. Even minor wear can lead to poor fit and cause early bearing failure.
6. For hub bearing units, do not attempt to disassemble the hub bearing or adjust the seal of the hub unit, otherwise the seal may be damaged resulting in the entry of water or dust. Even the raceways of the seal ring and the inner ring are damaged, causing a permanent failure of the bearing.
7. There is a magnetic thrust ring in the seal ring equipped with the ABS device bearing. This kind of thrust ring can not be impacted, impacted or collided with other magnetic fields. Remove them from the box before installation and keep them away from magnetic fields such as motors or power tools. When installing these bearings, change the bearing operation by observing the ABS alarm pin on the instrument panel through road conditions.
8, wheel bearings equipped with ABS magnetic thrust ring, in order to determine which side of the thrust ring, you can use a light and small things near the edge of the bearing, the magnetic force generated by the bearing will attract it. The side with the magnetic thrust ring points inward when mounting, facing the sensitive element of ABS. Note: Improper installation may result in malfunction of the brake system.
9, many bearings are sealed, this type of bearing does not require grease during the entire life. Other non-hermetic bearings such as double row tapered roller bearings must be greased during installation. Because of the different sizes of the inner cavity of the bearing, 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, the excess oil will seep out when the bearing rotates. General experience: At the time of installation, the total amount of grease accounts for 50% of the bearing clearance.
10. When the lock nut is installed, the torque varies greatly depending on the type of bearing and the bearing seat.
In the past, the largest number of hub bearings for a sedan was a pair of single row tapered roller or ball bearings. With the development of technology, sedan has been widely used car wheel unit. The range of use and the amount of use of wheel hub bearing units has been growing and has now reached 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 be easily fixed to the axle with a nut. Makes the maintenance of the car easier. The third-generation hub bearing unit is a combination of a bearing unit and an 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.