How to diagnose air suspension compressor problems
In order to quickly attenuate the vibration of the frame and the body, and improve the ride comfort and comfort of the car, the car suspension system is generally equipped with shock absorbers. At present, the two-way-acting cylinder shock absorber is widely used in automobiles. Shock absorber is a vulnerable part in the process of car use. The working quality of the shock absorber will directly affect the smoothness of the car and the life of other parts. Therefore, we should keep the shock absorber in good working condition. The following methods can be used to check whether the shock absorber is working well.
Make the car stop after driving 10km on the road with poor road conditions, 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 does not work. At this time, you can add appropriate lubricating oil and perform the test again. 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; press the bumper firmly and then loosen it. If the car jumps 2~3 times, it means that the shock absorber is working well; when the car is driving slowly and braking urgently, if the car vibrates severely, it means that there is a problem with the shock absorber; remove the shock absorber and stand it upright, and Clamp the lower end connecting ring on a vise, and forcefully pull the damping rod several times. At this time, there should be stable resistance. The resistance of pulling upwards should be greater than the resistance of pressing downwards. If the resistance is unstable or no resistance, it may It is due to lack of oil inside the shock absorber or damage to valve parts, repair or replacement parts should be carried out.
After determining that the shock absorber is faulty or invalid, 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. It may be that the oil seal and 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 shock absorber piston connecting rod is bent, and the piston connecting rod Whether there are scratches or pull marks on the surface and cylinder.
If there is no oil leakage from the shock absorber, 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 is tightly attached to the valve seat, and reducing Whether the extension spring of the shock device is too soft or broken, it should be repaired by grinding or replacing parts according to the situation.
In addition, the shock absorber may 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, and the oil If it is caused by insufficient or other reasons, the cause shall be found out and repaired.
After the shock absorber is inspected and repaired, the performance test should be carried out on a special test bench. When the resistance frequency is 100±1mm, the resistance of the extension stroke and compression stroke should meet the requirements, indicating that the shock absorber is basically normal.