1. Make the car stop on the road with poor road conditions for 10km and stop it. Touch the damper shell by hand. If it is not hot enough, there is no resistance inside the damper and the damper does not work. At this point, can add appropriate lubricants, and then test, if the shell is hot, it is the lack of oil within the shock absorber, should add enough oil; otherwise, explain the shock absorber failure. 2. Press the bumper firmly and release it. If the car has 2 or 3 jumps, the shock absorber is working well. 3. When the car is moving slowly and it is in emergency braking, if the car vibrates more violently, there is a problem with the shock absorber. 4. Remove the shock absorber and erect it, and clamp the lower end of the connecting ring on the vise. Pull the damper rod several times. This time, there should be stable resistance. The resistance to pull up (recover) should be greater than The resistance under pressure, such as unstable or no resistance, may be due to lack of oil inside the shock absorber or damage to the valve parts. Repair or replacement of parts should be performed. After determining the problem or failure of the shock absorber, it is necessary to check whether the damper has leaked oil or traces of old oil leakage. Oil seal gaskets and gaskets cracked and damaged, and the fuel tank cap nuts loosened. If oil leakage is found, tighten the cylinder head nut first. If the shock absorber still leaks oil, the oil seal and the sealing gasket may be damaged. Replace the new seal. If you still can not eliminate the oil leakage, should pull out the damping rod, if you feel there is a hairpin or different severity, and then further check the piston and the cylinder between the gap is too large, the shock absorber piston rod bending, the piston rod Whether the surface and cylinder are scratched or scratched. If there is no oil leakage in the shock absorber, check the shock absorber connecting pin, connecting rod, connecting hole, rubber bush, etc. for damage, unwelding, breaking or falling off. If the above inspection is normal, the shock absorber should be further decomposed to check whether the clearance between the piston and the cylinder is too large, whether the cylinder is damaged, whether the valve seal is good, and whether the valve flap and the valve seat are tightly adhered or not. Is the extension spring of the damper excessively soft or broken, and repair it by grinding or changing parts as the case may be. In addition, the shock absorber will produce audible faults in actual use. Car-m.cn is mainly due to collision of the shock absorber with the leaf spring, frame or shaft, damage or loss of the shock absorber, and shock absorber dust protection. If the cylinder is deformed or the fluid is insufficient, the cause must be identified and repaired. After the shock absorber is checked and repaired, the work performance test shall be conducted on a special test bench. When the resistance frequency is 100±1mm, the resistance of the extension stroke and the compression stroke shall meet the requirements. For example, the maximum resistance of the liberation CA1091 is 2156~2646N, the maximum resistance of the compression stroke is 392~588N; the maximum resistance of the east windmill's extension stroke is 2450~3038N, and the maximum resistance of the compression stroke is 490~686N. If there is no test condition, we can also use an empirical approach, that is, use an iron rod to penetrate into the lower end of the shock absorber, and use both feet to hold it at both ends. Hold the upper ring with both hands and pull it back and forth 2 to 4 times. There is a lot of resistance when pulling upwards. When you press down, you do not feel any effort, and the resistance of stretching is restored compared with that before the repair. No sense of idleness means that the shock absorber is basically normal.
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Chassis maintenance shock absorber maintenance and repair
Shock absorbers are vulnerable parts in the process of automobile use. The work of shock absorbers will directly affect the smooth running of the car and the life of other parts. Therefore, we should make the shock absorber always in a good working condition. The following methods can be used to verify that the shock absorber is working properly.