The car shock absorber is usually connected to the car body and the chassis. Loosen the upper and lower screws and use a large screwdriver to pry it out. When changing the new one, first touch a little butter. Sometimes the upper and lower positions may not be right. If the upper and lower gaps are large, the shock absorbers will be hung first. One end, the other head is pulled out to the correct position. If the gap is small, just look for the jack to hit the body to the correct position, and tighten the screws.
After confirming that there is a problem or failure of the shock absorber, first check the shock absorber for oil leakage or traces of old oil leakage. The oil seal gasket and the sealing gasket are broken and the oil storage cylinder cover nut is loose. It may be that the oil seal and the gasket are damaged, and a new seal should be replaced. If the oil leakage still cannot be eliminated, pull out the shock absorber. If there is a hairpin or light weight, check whether the gap between the piston and the cylinder is too large, and whether the shock absorber piston rod is bent or not. Whether the surface and the cylinder are scratched or scratched. If there is no oil leakage in the shock absorber, check the shock absorber connection 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 decomposed to check whether the matching clearance between the piston and the cylinder is too large, whether there is a strain in the cylinder, whether the valve seal is good, whether the valve flap and the valve seat are tightly attached, and Whether the tension spring of the shock absorber is too soft or broken, and repair or repair according to the situation. In addition, the shock absorber will have a sounding fault in actual use, mainly due to the shock absorber colliding with the leaf spring , the frame or the shaft, the rubber pad is damaged or dropped, and the shock absorber dust cylinder is deformed, the oil If it is caused by insufficient reasons, etc., the cause should be identified and repaired.
The shock absorber shall be tested on the special test bench after the inspection and repair. When the resistance frequency is 100±1mm, the resistance of the extension stroke and the compression stroke shall comply with the regulations. For example, the maximum resistance of the CAl091 stretch stroke is 2156~2646N, the maximum resistance of the compression stroke is 392~588N; the maximum resistance of the east windmill stretch stroke is 2450~3038N, and the maximum resistance of the compression stroke is 490~686N. If there is no test condition, we can also use an empirical method, that is, use an iron rod to penetrate into the lower end of the shock absorber, and use both feet to step on both ends. Hold the upper loop with both hands and pull it back and forth 2~4 times. When pulling up, the resistance is very large. When pressing down, it does not feel laborious, and the resistance of stretching is restored compared with that before repair. If there is no feeling of empty space, it means that the shock absorber is basically normal.