In other modified wheel Precautions :
1, in order to ensure maximum safety and reliability , it is recommended that you no matter how long the age of the vehicle should always check the wheel bearings - note bearing for wear early warning signals: including any friction noise when turning the wheel in a turn or a combination of suspension when not normal deceleration .
Rear-wheel drive vehicle is recommended for the vehicle to 38,000 kilometers in response to the front wheel hub bearings are lubricated . When replacing the brake system, check the bearing and replace the seal.
2 , If you hear noise emitted wheel bearing parts , first of all, it is important to find the location of the noise occurs . There are many moving parts may produce noise , and some may not rotate the rotation member and the contact member occurs . If the confirmation is bearing noise , the bearing may be damaged and need replacing.
3 , because the front wheel hub bearing failure on both sides led to similar working conditions , so even if only one bearing bad , it is recommended to replace in pairs .
4 , wheel bearings are more sensitive , in any case need to adopt the right approach and the right tools. In storage and during installation , the bearing parts can not be damaged. Some bearings require greater pressure pushed , so they need special tools, car manufacturers must reference manual .
5 , the installation of the bearing should clean environment, small particles from entering the bearing will shorten bearing life. Replacement of bearings to maintain a clean environment is very important . Allowed to tap with a hammer bearing note bearing not fall to the ground.
Before mounting the shaft and housing should also check the status of even slight wear will lead to poor fit , thereby causing early failure of the bearing .
6 , the hub bearing unit , do not attempt to disassemble or adjust the wheel hub bearing seal unit , otherwise it would lead to water damage to seals or dust. Even ring and the inner ring raceway are damaged , resulting in permanent failure of the bearing.
7 , the inner ring is equipped with ABS unit has a magnetic thrust bearing ring , thrust ring can not be subjected to such a collision , impact or collision with other field . Remove from the box before installation , so that they stay away from magnetic fields , such as the use of electric motors or electric tools. When installing these bearings , the road test by observing the dashboard ABS alarm pin to change the bearing operation.
8 , equipped with ABS magnetic wheel hub bearing thrust ring , thrust ring mounted in order to determine which side , you can use a little something light near the edge of the bearing , magnetic bearings will be attracted by it generated . When installing the magnetic thrust belt loop while pointing inside , is on the ABS sensor . Note Incorrect installation may lead to functional brake system failure.
9 , many of the bearings are sealed, the entire life of these bearings is no need to add grease . Other non- sealed bearings such as double row tapered roller bearings in the installation must be added grease. Due to the different sizes of the bearing cavity , it is difficult to determine how much of the added fat, the most important thing is to ensure that the grease bearing if too much fat , when the bearing is rotating , the excess oil will bleed . General Experience: At installation, the total amount of fat to 50% of the bearing clearance .
10 , when installing the lock nut due to the different types of bearings and bearing housings , the size difference between the torque is great.
Since the spill , reduce internal engine oil , resulting in poor mechanical lubrication, inadequate cooling , can cause mechanical damage early , even leaving accidents.
According Hengding noted automotive hub units , common vehicle spill six reasons:
1, the product ( accessories ) quality , materials or workmanship is poor ; structural design problems ;
2 , the assembly of high-speed improper mating surfaces dirty , damaged liner , displacement or failure to standardize procedures for installation ;
3 , tighten the nut force uneven or slippery silk rattling off snap off work as a result of the failure ;
4, after sealing material worn over long-term use restrictions , aging deterioration , deformation failure ;
5 , add too much oil , the oil level is too high or mistake of oil ;
6 , parts ( side cover classes , thin-walled parts ) engaging surface deflection , the housing is damaged, so that oil leaking ;
7 , vent plug , the one-way valve plug, because the pressure difference inside and outside the enclosure role , often lead to seal leakage weaknesses .
According Hengding car vehicle wheel hub unit understand spill prevention measures:
1 , emphasis on cushioning effect . Automotive standing parts (such as the end face of each engagement , each cover, shell, cover pads, flat enamel cover , etc. ) between the components plays a leakproof liner seal . If the materials, production quality and installation does not meet the technical specifications , would not achieve the role of leak-proof seal , even accidents. If the oil pan or valve cover , due to the large contact area and difficult to compaction , the resulting oil spills ;
2 , various types of fastening torque car nuts are tightened regulations required . Pressure is not too loose tight liner would leak ; too tight will make the metal bumps or holes around the threaded screw slide caused by oil spills. In addition, the oil pan drain plug back if not tighten or loosen off, likely to cause oil loss , and subsequent " Burnt axle " of engine damage accident ;
3 , the timely replacement of seal failure . Many parts of the vehicle moving home ( such as oil seals , O-rings ) due to improper installation , journal and seal edge misalignment , deflection and dumped oil. Some seals used for a long time due to aging and loss of elasticity of rubber . Found leakage should be updated ;
4, to avoid a one-way valve , through the valve blocked. Resulting tank shell temperature, oil filled the entire space , emissions do not go out , so that increased pressure tank shell oil consumption increases and the replacement cycle is shortened. After the engine ventilation system clogged , increasing the resistance movement of the piston, fuel consumption increases. Due to the pressure difference inside and outside the enclosure role , often lead to seal leakage weaknesses . Hence the need for regular inspection of vehicles , and clear , cleaning ;
5 , to properly resolve all kinds of pipe joint seals . Vehicle union nut often removable, easy to buckle and slide wire break loose , causing oil leakage . Replace the union nut , with its conical grinding method to solve the sealing nut and solve pressing seal ;
6 , to avoid rejection of the oil hub . Wheel bearings and grease cavity excessive or improper seal assembly , poor quality and aging failure ; wheel brake frequently caused by excessive temperature ; axle nut loose , and this will lead to rejection of the oil hub . Thus the word " cavity lubrication ( ie the amount of lubrication ) ," clear vent . In the use of the vehicle, often appear spill failure , it will directly affect the technical performance of the car, resulting in lubricants, fuel waste, consumption of power , the impact of the car clean and tidy , causing environmental pollution. Since the spill , reduce internal engine oil , resulting in poor mechanical lubrication, inadequate cooling , can cause mechanical damage early , even leaving accidents.
