To make the frame and the rapid decay of the vibration of the body, improve vehicle ride and driving comfort, vehicle suspension systems are generally equipped with shock absorbers, the current car is a widely used two-way acting tube damper.

Auto shock absorber is used in the process of wearing parts, shock absorbers work is good or bad, will directly affect the smooth running car and other parts of life, so we should make the shock absorbers in good working condition always. The following methods can test whether the work of a good shock absorber.

1. Poor road conditions make the car drive 10km on the road after parking, touch shell shock, if not hot enough, the internal shock absorber shows no resistance, shock absorbers do not work. At this point, can be added to the appropriate oil, then test, if the case of fever, compared with an internal shock absorber oil, should add a little oil; otherwise, indicating the shock absorber failure.

2. Press down firmly on the bumper, then release, if the car has 2 or 3 times jump, then the shock absorbers work well.

3. When the car slowly driving the emergency brake, if more severe vehicle vibration, indicating the shock absorber problem.

4. Remove the shock absorber to erect, and clip the bottom of the connecting ring in the vise on the tension and compression damping force shot several times, then there should be a stable resistance, pull up (recovery) should be greater than the resistance down when the pressure resistance, such as resistance to unstable or no resistance, the internal shock absorber may be short of oil or damage the valve parts, should be repaired or replaced.

In determining the shock absorber problems or failure, it should first check whether the oil shock absorber or traces of old oil.

Seal gasket, sealing gasket rupture damage, oil storage cylinder head nut loose. May be oil seals, gasket damage failure, should be replaced with new seals. If you still can not eliminate leakage, shock absorbers should be pulled out, if they feel there is not a time card or severity, further examination of the piston and cylinder gap is too large, whether the curved shock absorber piston rod, piston rod cylinder surface and whether there is scratch or pull marks.

If the shock absorber does not leak phenomenon, you should check the shock absorbers connecting pin, connecting rod, connecting holes, such as whether there is damage to the rubber bushing, sealing off, break or fall off of the place. If the examination was normal, should be further broken down shock absorbers, check the piston and cylinder with the gap is too large, cylinder without strain, the valve seal is good, the valve flap and valve seat is tight fitting, and done damper spring is too soft or broken, grinding, or under the circumstances to take measures for repair parts.

In addition, the shock absorber will appear in the actual issue with the sound of failure, mainly due to shock absorbers and leaf springs, frame or shaft collide, damage or loss, and shock absorber pad dust tube deformation, fluid lack of other causes, reasons should be identified, to be repaired.

After the inspection, repair the shock absorber should be in a special test bench performance tests, when the resistance frequency of 100 ± 1mm, its journey done, and the resistance to compression stroke should be specified. As the biggest obstacle to the liberation of CAl091 done for the trip 2156 ~ 2646N, the biggest obstacle for the compression stroke 392 ~ 588N; Dongfeng car trip done the biggest obstacle to 2450 ~ 3038N, maximum resistance to compression stroke is 490 ~ 686N. If there is no experimental conditions, we can also use an empirical approach, which uses an iron bar penetrated the bottom of the shock absorber inside the rings, with their feet slam ends, pull both hands back and forth on the rings 2 to 4 times, when great resistance when pulling up, not down when the pressure was laborious, but the resistance to stretching than before some recovery and repair, without a sense of air-way, then the shock normal.