In order to reduce the vibration of the frame and body quickly, improve the ride comfort and comfort of the car, the vehicle suspension system is usually equipped with shock absorbers, and the two-way action cylinder type shock absorber is widely used. It is a fragile accessory in the process of automobile use. The work and quality of the shock absorber will directly affect the stability of the car and the life of other parts. Therefore, we should make the shock absorber always in good working condition. The following methods can be used to check whether the shock absorber works well. 1. make the car stop after 10km on the road with poor road conditions and touch the shock absorber shell with hand. If it is not hot enough, it shows that there is no resistance inside the shock absorber and the shock absorber does not work. At this time, the proper lubricating oil can be added to the test. If the shell is heated, the oil is deficient inside the shock absorber, and the oil should be added; otherwise, the shock absorber is invalid. 2. press down the bumper and then release it. If the car has a 2~3 jump, it will indicate that the shock absorber works well. 3. when the car is running slowly and emergency braking, if the vehicle vibration is more intense, it shows that there is a problem with the shock absorber. 4. remove the shock absorber and hold it upright and clamp the lower end connecting ring on the table forceps and pull the damper several times. At this time, it should have stable resistance. The resistance to pull up should be greater than that of downward pressure, such as instability of resistance or no resistance, it may be the lack of oil or damage inside the shock absorber, which should be repaired or replaced zero. Piece. After determining the problem or failure of the shock absorber, check whether the shock absorber is leaking oil or has traces of old oil leakage. The oil seal washer and the sealing washer are broken and damaged, and the nut of the oil cylinder cover is loose. It may be the damage of oil seal and sealing washer. New seals should be replaced. If the oil leakage is still not eliminated, the shock absorber should be pulled out. If there is a hairpin or light weight, further check whether the gap between the piston and cylinder is too large, the piston rod of the shock absorber is bent, the piston rod surface and cylinder have scratches or scratches. If the shock absorber has no phenomenon, check whether there is any damage, welding, rupture or shedding of the damper connection pin, connecting rod, connecting hole, rubber, bushing and so on. If the above inspection is normal, the shock absorber should be further decomposed to check whether the clearance gap between the piston and the cylinder is too large, the cylinder is pulled, the valve is sealed well, the valve and the valve seat are closely fitted, and whether the extension spring of the shock absorber is soft or broken, and repairs or replacement is taken according to the condition. . In addition, the shock absorber will have a sound failure in actual use, which is mainly due to the impact of the shock absorber with the steel plate spring, the frame or the axle, the damage or shedding of the rubber cushion, the deformation of the shock absorber tube and the insufficiency of the oil. When the shock absorber is checked and repaired, the performance test should be carried out on a special test bed. When the resistance frequency is 100 + 1mm, the resistance of the extension stroke and the compression stroke should be in accordance with the regulations, indicating that the shock absorber is basically normal.