After determining that the shock absorber has problems or failures, first check whether the shock absorber is leaking or has traces of old oil leakage, the oil seal gasket, the sealing gasket are broken and damaged, and the oil storage cylinder head nut is loose. It may be that the oil seal and the sealing 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 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 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 fitted, and whether Whether the extension spring of the shock is too soft or broken, it should be repaired by grinding or replacing parts according to the situation.
In addition, the shock absorber will 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. Insufficiency and other reasons should be found out and repaired. Make the car stop after driving 10km 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.
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 stable resistance, and the resistance of pulling upwards should be greater than that of pressing downwards. If the resistance is unstable or there is no resistance, it may be due to lack of oil inside the shock absorber or damage to the valve parts. Repair or replace the parts.