Automobile shock absorbers are vulnerable parts. The working quality of the shock absorber will directly affect the smoothness of the car and the life of other parts. So we should keep the shock absorber in good working condition. We can use the following methods to check whether the shock absorber is in good working condition.
1. Make the car stop after driving 10km on the road with poor road conditions, and touch the shock absorber shell by hand. If it is not hot enough, it means that there is no resistance inside the shock absorber and the shock absorber is not working. At this time, you can add appropriate lubricating oil, and then carry out the 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 has 2-3 jumps, the shock absorber is working well.
3. When the car is driving slowly and braking urgently, if the car vibrates violently, it indicates that there is a problem with the shock absorber.
4. Remove the shock absorber and stand it upright, and clamp the lower end connecting ring to the vise, and pull the shock absorber rod several times. At this time, there should be a stable resistance, and the resistance of pulling up (recovering) should be greater than the resistance of pressing down. If the resistance is unstable or there is no resistance, it may be due to the lack of oil inside the shock absorber or the valve parts are damaged, and the parts should be repaired or replaced.
After determining that there is a problem or failure of the shock absorber, you should first check whether the shock absorber is leaking or has traces of old oil leakage.
The oil seal washer and sealing washer are broken and damaged, and the oil storage cylinder head nut is loose.
If oil leakage is found, first tighten the cylinder head nut. If the shock absorber still leaks, the oil seal and sealing gasket may be damaged and invalid, and new seals should be replaced. If the oil leakage still cannot be eliminated, pull out the damping 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 piston connecting rod of the shock absorber is bent, and the piston connecting rod Whether there are scratches or pull marks on the surface and cylinder.
If the shock absorber does not leak oil, 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 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 whether Whether the extension spring of the vibrator is too soft or broken. According to the situation, it can be repaired by grinding or replacing parts.
In addition, the shock absorber will have noise failure in actual use, which is mainly due to the shock of the shock absorber and the leaf spring, the frame or the axle, the damage or fall of the rubber pad, the deformation of the shock absorber dust tube, and the lack of oil. If it is caused by other reasons, the cause should be found out and repaired.