How to repair and maintain automobile wheel bearings

For the lubrication of automobile wheel bearings, if the temperature is -20 to 120 degrees, ordinary lithium molybdenum disulfide grease can be used.

However, if the temperature is lower than minus 20 degrees, or the wheel hub is too high to exceed 120 degrees under heavy load or continuous braking temperature, it is necessary to use fully synthetic molybdenum disulfide high-temperature grease to ensure the normal lubrication of the wheel hub at low temperature and high temperature.

Methods of maintenance of automobile wheel bearings:

1. Clean the bearing with kerosene or gasoline after disassembly, carefully observe whether the inner and outer dimensions of the cylindrical surface of the bearing imitate the phenomenon of sliding or creeping, whether there is spalling and pitting corrosion on the inner and outer raceway surfaces of the bearing, and whether the rolling elements and cages are worn;

2. According to the comprehensive situation of bearing inspection, judge whether the bearing can continue to be used, and regularly fill lubricating oil or grease;

3. According to the use of the vehicle, the chain tank should be completely replaced with lubricating oil at least once every six months, and the bearings should be carefully inspected.

Introduction to the replacement method of automobile wheel bearing: 1. Disassemble the tire. Removing the tires allows you to see the car's brake discs and calipers, and when you remove them, you can see the front wheel bearings.

Disassemble the bearing fastening nut. Remove the outer dust cover of the bearing with the opening, you can see the big nut that fixes the bearing, and remove the nut with a sleeve of 30;

2. Disassemble the brake caliper and bury the wheel. Use an 18-Torx wrench to remove the two screws that hold the brake caliper and slowly remove the brake caliper to prevent the brake hose from breaking. Remove the brake disc.

If the brake disc cannot be removed, you can use two screws to screw it on the brake disc hole, and tighten the screws with the corresponding wrench to remove the brake disc;

3. Remove the front wheel bearing. The sturdy nut on the outside of the bearing has been removed, and the bearing can be removed by pulling it out with both hands. Install new bearings.

Install the new bearing, replace the new strong nut, after tightening the nut, rivet the edge of the nut with an opening, so that the nut is stronger, and install the dust cover. Brake discs and calipers are installed. Install the brake disc and brake caliper, and the bearing will be replaced this time.

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1. Pay attention to whether the bearing has early warning signs of wear: including any friction noise during rotation or abnormal deceleration of the suspension combination wheel when turning.

2. In the process of storing, transporting and installing hub bearings, in order to protect the bearing components, we must refer to the automobile manufacturing instructions and select special tools for installation.

3. It is recommended to replace the bearings in pairs, if there is a problem on one side, the integrity of the other side is questioned due to various considerations, so replacing it together is also a preventive method.

4. In order to ensure the long service life of the bearing, the shaft and bearing seat should be carefully checked before installation, but the bearing should not be hit with a hard object.

5. Do not attempt to disassemble the hub bearing or adjust the sealing ring of the hub bearing unit, otherwise the sealing ring will be damaged and water or dust will enter. Even the raceways of the seals and inner rings were damaged, causing permanent failure of the bearings.

6. When the hub bearing with the ABS magnetic thrust ring is installed, point the side with the magnetic thrust ring to the inside, which is facing the sensitive element of the ABS. If you are not sure which side of the thrust ring is mounted, you can use a small light object to approach the edge of the bearing, and the magnetic force generated by the bearing will attract it, and whether it is installed correctly or not is related to the function of the brake system.

7. Ensure that the magnetic thrust ring in the sealing ring equipped with ABS device bearing will not be subjected to external force, including other magnetic field collision and impact. When removing from the box before installation, keep it away from magnetic fields. When these bearings are installed, the operation of the bearings is changed by observing the ABS alarm pin on the instrument panel through road condition testing.

8. Ensure that there is a sufficient amount of grease in the bearing. For some unsealed bearings, such as double row tapered roller bearings, grease lubrication is required during installation, while sealed bearings are not. Due to the different sizes of the inner cavity of the bearing, it is impossible to determine how much grease to add, and if there is too much grease, when the bearing rotates, the excess beats will seep out.

General rule: During installation, the total amount of grease should account for 50% of the clearance of the bearing.

9. When installing the lock nut, the size of the torque varies greatly due to the different bearing types and bearing seats. Take care to refer to the instructions.

10. In order to ensure the safety and reliability of the empty ride to the greatest extent, it is recommended that you check the wheel bearings frequently no matter how old the car is.

For rear-wheel drive vehicles, it is recommended that the front wheel bearings should be lubricated at 38,000 km. When replacing the brake system, check the bearings and replace the oil seals.

11. In addition, when the bearing is installed, it should be in a clean and tidy environment to prevent fine particles from entering the bearing and shorten the service life of the bearing.

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1. At present, most of the wheel bearings used in small passenger limb greeting cars adopt sealed double-row angular contact bearings;

2. This kind of bearing is filled with grease to ensure the lifelong lubrication needs of the bearing, and the grease is sealed inside the bearing by the oil seal;

3. If there is damage, the assembly will be replaced directly, and there is basically no need to do any maintenance halfway, so it can be said that this wheel bearing is maintenance-free.

Required, the method of wheel bearing maintenance:

1. The trolley wheel bearing is a maintenance-free bearing, but some can be maintained manually;

2. Bearing is an important component in contemporary machinery and equipment. Its main function is to support the mechanical rotating body to be bright, reduce the friction coefficient during its movement, and ensure its rotation accuracy;

3. According to the different friction properties of moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, rolling bearings have been standardized and serialized, but compared with sliding bearings, its radial size, vibration and noise clearance volts are larger, and the highest level is also higher;

4. The rolling bearing is generally composed of four parts: the outer ring, the inner ring, the socks carrying the rolling element and the cage. According to the shape of the rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.

Precautions for car tire bearing maintenance:

1. Pay attention to the driving sound of the tire, when driving normally, the tire only has the normal tire noise sound, if there is the sound of stones pressing the ground, it may be that the tire has pebbles embedded. If there is a knocking sound, the tire screws may be loose, and it should be checked in time;

2. Usually pay attention to the habit of checking the tires before driving, in addition to looking at the tire pressure, but also to see whether there is damage on the surface of the tire, and whether there are nails and other foreign objects;

3. Pay attention to the sound of the car's tires, if it is different from the usual driving sound, stop and check in time. Especially the sound of metal colliding, creaking, squeaking, etc.

For rear-wheel drive vehicles, 38,000 kilometers of driving need to be inspected and maintained on the wheel bearings of the car to ensure the safety of the vehicle.

For wheel bearings, the hub offset is a very important concept, and the larger the offset, the more the wheel will be visually retracted into the wheel arch than the original wheel hub. In addition, the wheel hub offset is also related to the steering characteristics of the vehicle, the wheel alignment angle, the gap is too large the offset value may lead to the tire is not right, the fan is often buried wear, the bearing is easy to wear, or even can not be installed normally.