In order to make the frame and the vibration of the body decays rapidly, improve ride comfort and comfort, vehicle suspension systems are generally equipped with shock absorbers, widely used in automobile is the double acting telescopic shock absorber. Effect of car stationarity and other parts of life, so we should make the shock absorber often is in good working condition. The following methods can be used to test whether the work of the shock absorber is good.
1 the car 10km road conditions in poor road parking, with the hand shock absorber shell, if not hot enough, indicating no resistance of shock absorber, shock absorber does not work. At this point, you can add the appropriate lubricating oil, and then the test, if the shell heat, then the shock absorber inside the lack of oil, should add enough oil; otherwise, the shock absorber failure.
2 press the bumper, and then release, if the car has 2~3 jump, then the shock absorber working well.
3 when the car is moving slowly and emergency brake, if the car vibration is more severe, the shock absorber has a problem.
4 remove the shock absorber and the lower end of the upright, the connecting ring clamped in a vise, pull rod vibration pressure several times, at this time should have a stable resistance to pull (recovery) resistance should be greater than the downward pressure resistance, such as resistance instability or no resistance, may damage internal shock absorber oil or the valve parts, should replace or repair parts.
In determining the shock absorber has a problem or failure, should first check whether the shock absorber oil spills or traces of old oil spills.
Oil seal washer, sealing washer is broken and damaged, and the cylinder cap nut is loose. May be the oil seal, seal gasket damage failure, should be replaced with a new seal. If you still can not eliminate oil leakage, should pull the shock absorber, if feel a hairpin or different time, then check the gap between piston and cylinder is too large, the shock absorber piston rod is bent, the piston rod and the cylinder surface is scratched or stretch marks.
If the shock absorber no leakage phenomenon, it should check the shock absorber connecting pin, a connecting rod, a connecting hole, such as whether there is damage to the rubber bushing, welding, crack or fall off. If the examination is normal, should be further decomposed with shock absorber, check the gap between piston and cylinder is too big, the cylinder is pulled, the valve seal is good, and the valve seat valve joint is tight, and the tension spring shock absorber is too soft or broken, take the grinding or change the way repair according to the situation.
In addition, the shock absorber will appear fault noise in actual use, this is mainly due to the collision and shock absorber plate spring and frame or shaft, pad damage or loss and shock absorber cylinder deformation caused by dust, oil shortage, should identify the reasons for repairs.
Shock absorber performance test work shall be carried out in a special test bench in the inspection after the repair, when the resistance frequency in 100 + 1mm, the extending stroke and compression stroke resistance shall comply with the provisions. Such as the liberation of CAl091 extending stroke maximum resistance is 2156~2646N, the maximum compression stroke resistance for 392~588N; Dongfeng car trip done maximum resistance to 2450~3038N, the maximum compression stroke resistance for 490~686N. If there is no experimental conditions, we can also use an empirical approach, which is connected with an iron rod into the absorber rings, with their feet stepped on its ends, the hands hold the rings on the reciprocating pull 2~4 times, when to pull down the pressure of great resistance, when they do not feel laborious, but the tensile resistance recovery compared with before repairing, no sense of history, shows that the shock absorber is normal.
