Shock absorber is a vulnerable part in the process of automobile use. The working quality of the shock absorber will directly affect the stability of the automobile and the service life of other parts. Therefore, the shock absorber should always be in good working condition.
After confirming that the shock absorber is faulty or invalid, please first check whether the shock absorber is leaking or has old oil leakage traces.
The oil seal washer and sealing washer are damaged, and the oil storage cylinder head nut is loose. It may be that the oil seal and the gasket are damaged and invalid. Replace with new seals. If the oil leakage still cannot be eliminated, pull out the shock absorber. If you feel a hairpin or change in weight, check whether the gap between the piston and the cylinder is too large. Whether the piston connecting rod of the vibrator is bent, whether the surface of the piston connecting rod and the cylinder barrel is scratched or has pull marks.
If there is no oil leakage from the shock absorber, please check whether the connecting pins, connecting rods, connecting holes, rubber bushings, etc. of the shock absorber are damaged, disconnected, cracked or fallen off. If the above inspection is normal, the shock absorber should be further disassembled to check whether the matching gap between the piston and the cylinder is too large, whether the cylinder is strained, whether the valve is well sealed, whether the valve clack and the valve seat are tightly attached, and reduce Whether the extension spring of the vibrator is too soft or broken, it should be ground or replaced according to the situation.
In addition, due to the collision of the shock absorber with the leaf spring, the frame or the axle, the damage or fall off of the rubber pad, the deformation of the shock absorber dust tube, the lack of oil, etc., the shock absorber will produce noise in actual use. You should find out Reason and repair it.
After the shock absorber is inspected and repaired, the performance test should be carried out on a special test bench. When the resistance frequency is 100±1mm, the resistance of the extension stroke and the compression stroke should meet the requirements. If there is no test condition, we can also use an empirical method, that is, use an iron rod to pass through the lower end of the shock absorber, step on both ends of the shock absorber, and hold the upper ring with both hands and pull it back and forth 2 to 4 times. There is a lot of resistance when you pull up, and you don't feel any effort when you press down. Compared with before repair, the resistance of stretching is restored, and there is no sense of empty travel, which shows that the shock absorber is basically normal.