Cushion pads and bushes, if the flat bearing and top rubber are not good, also need to be replaced.
　　 Shock absorber is a vulnerable part in the process of car use. The working quality of the shock absorber will directly affect the smoothness of the car and the life of other parts. Therefore, we should keep the shock absorber in good working condition. The following methods can be used to check whether the shock absorber is working well.
　　1. Stop the car after driving 10 kilometers on a road with poor road conditions, and touch the shock absorber shell with your hands. If it is not hot enough, it means that there is no resistance inside the shock absorber and the shock absorber does not work. At this time, you can add appropriate lubricating oil, and then test, if the shell heats up, there is a lack of oil inside the shock absorber, and enough oil should be added; otherwise, the shock absorber has failed.
　　2. Press the bumper firmly and then release it. If the car jumps 2 or 3 times, the shock absorber is working well.
　　3. When the car is driving slowly and braking urgently, if the car shakes violently, it means there is a problem with the shock absorber.
4. Remove the shock absorber and stand it upright, and clamp the lower connecting ring to the vise, and then forcefully pull the shock absorber rod several times. At this time, there should be a stable resistance. The resistance of pulling upwards and restoring should be greater than pressing downwards. The resistance at the time, such as unstable or no resistance, may be the lack of oil inside the shock absorber or damage to the valve parts. Repair or replacement parts should be carried out.
　　 After determining that the shock absorber is faulty or invalid, first check whether the shock absorber leaks or has traces of old oil leakage.
　　 If oil leakage is found, first tighten the cylinder head nut. If the shock absorber still leaks, the oil seal and gasket may be damaged and invalid, and new seals should be replaced. If the oil leakage still cannot be eliminated, pull out the shock absorber rod. If you feel a hairpin or change in weight, check whether the gap between the piston and the cylinder is too large, whether the shock absorber piston connecting rod is bent, and the piston connecting rod Whether there are scratches or pull marks on the surface and cylinder.
　　 If there is no oil leakage from the shock absorber, check the shock absorber connecting pin, connecting rod, connecting hole, rubber bushing, etc. for damage, desoldering, cracking or falling off. If the above inspection is normal, the shock absorber should be further disassembled to check whether the matching clearance between the piston and the cylinder is too large, whether the cylinder is strained, whether the valve seal is good, whether the valve clack and the valve seat are tightly attached, and whether Whether the extension spring of the shock device is too soft or broken, it should be repaired by grinding or replacing parts according to the situation.
In addition, the shock absorber may have noise failure in actual use, which is mainly due to the shock absorber colliding with the leaf spring, the frame or the axle, the rubber pad is damaged or falling off, and the shock absorber dust tube is deformed, and the oil If it is caused by insufficient or other reasons, the cause shall be found out and repaired.