The car's hub bearings used to be most common in pairs using single-row conical rollers or ball bearings. With the development of technology, cars have been widely used in car wheel units. The wheel bearing unit is increasingin in scope and use and has now developed into a third generation: the first generation is made up of double-row angle contact bearings. The second generation has a flange on the outer rollers that securethe the bearings, which can be simply secured with nuts on the shaft. Make the car repair easier. The third generation hub bearing unit is a combination of bearing unit and anti-holding brake system.
The hub unit is designed with an inner and outer flange, which is bolted to the drive shaft and the outer flange installs the entire bearing together. Wearing or damaging hub bearings or hub units can cause inappropriate and costly failures on your vehicle along the way, and may even cause damage to your safety.
In the use and installation of hub bearings, please pay attention to the following:
1. In order to maximize safety and safety, it is recommended that you always check the wheel bearings regardless of the age of the car - pay attention to whether the bearings have an early warning signal of wear: including any frictional noise during rotation or abnormal deceleration of the suspension combined wheel during cornering. Vehicles with rear-wheel drive are recommended to lubricate front hub bearings when the vehicle travels up to 38,000 km.
When replacing the brake system, check the bearings and replace the seal. 2, if you hear the noise from the hub bearing area, first of all, it is important to find where the noise occurs. There are many moving parts that can produce noise, or some rotating parts may come into contact with non-rotating parts.
If it is confirmed that the noise in the bearing may be damaged and needs to be replaced.
3, because the front hub causes the two sides of the bearing failure of the operating conditions are similar, so even if only one bearing is broken, it is recommended to replace in pairs. 4, hub bearings are sensitive, in any case need to use the right method and the right tools. The components of the bearing must not be damaged during storage, transportation and installation. Some bearings require a large pressure in, so special tools are required.
Be sure to refer to the car manufacturing instructions. 5, the installation of bearings should be in a clean and tidy environment, small particles into the bearing will also shorten the life of the bearing. It is important to maintain a clean environment when changing bearings. Do not use a hammer to tap the bearing, be careful not to fall on the ground (or similar improper treatment).
The condition of the shaft and housing should also be checked prior to installation, and even minor wear can lead to poor fit, which can lead to early bearing failure. 6, the hub bearing unit, do not attempt to open the hub bearing or adjust the hub unit seal ring, otherwise it will cause damage to the seal ring leading to water or dust into.
Even the raceways of the seal and inner ring are damaged, causing the bearings to fail permanently. 7, equipped with ABS device bearings in the sealing ring has a magnetic thrust ring, this thrust ring can not be subject edithing, impact or collision with other magnetic fields. Remove from the box before installation and keep them away from magnetic fields, such as electric motors or power tools used.
When installing these bearings, change the operation of the bearings by observing the ABS alarm needle on the dashboard through the road condition test. 8, equipped with ABS magnetic thrust ring hub bearings, in order to determine where the thrust ring is installed on which side, 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 installing, one side with a magnetic thrust ring points inside, which is sensitive to the ABS.
Note: Incorrect installation may cause the function of the brake system to fail. 9. Many bearings are sealed, such bearings do not need grease throughout their life. Other unsealed bearings, such as two-row conical roller bearings, must be lubricated with grease when installed. Because the inner cavity size of the bearing is different, it is difficult to determine how much grease is added, the most important thing is to ensure that there is grease in the bearing, if there is too much grease, when the bearing rotates, excess grease will seep out.
General experience: In the installation, the total amount of grease to account for 50% of the bearing gap. 10, when installing the lock nut, due to the bearing type and bearing seat differences, the size of torque is very different. Note that reference is given to the instructions.