Remove the shock absorber and stand it upright
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, and the oil Insufficiency and other reasons should be found out and repaired. is damaged, desoldered, cracked or dropped off.It may be that the oil seal and sealing gasket are damaged and invalid. Second, press the bumper firmly and then release it. Auto Parts-Inspection 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, and the two-way-acting cylinder shock absorber is widely used in cars. Fourth, remove the shock absorber and stand it upright, and clamp the lower end connecting ring on the vise, and then forcefully pull the shock absorber rod several times.
Shock absorber testing includes shock absorber performance test, shock absorber durability test, shock absorber double excitation test test. The oil Aluminum alloy auto parts Foundry seal washer and sealing washer are broken and damaged, and the oil storage cylinder head nut is loose. If there is 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 the oil leakage still cannot be eliminated, pull out the shock absorber. Replace with new seals. Repair or replace parts. If the car jumps 2 or 3 times, it means that the shock absorber is working well. Perform indicator test, friction test, temperature characteristic test, etc.
When the resistance frequency is 100±1mm, the resistance of the extension stroke and compression stroke should meet the requirements. If there is no oil leakage from the shock absorber, check the shock absorber connecting pin, connecting rod, connection Whether the hole, rubber bushing, etc. When the car is driving slowly and braking urgently, if the car vibrates violently, it means there is a problem with the shock absorber. Make the car stop after driving 10km on the road with poor road conditions and touch the shock absorber shell with your hands. At this time, there should be stable resistance. If there is no test condition, we can also adopt an empirical approach, that is, use an iron rod to penetrate the lower end of the shock absorber ring, which indicates that the shock absorber is basically normal. If it is not hot enough, it means that there is no resistance inside the shock absorber and the shock absorber does not work.
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 seal is good, whether the valve clack and the valve seat are tightly attached, 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. After the shock absorber is inspected and repaired, the performance test should be carried out on a special test bench.
The resistance of pulling up (restoring) should be greater than that of facing The resistance when pressing down, such as unstable or no resistance, may be due to lack of oil inside the shock absorber or damage to the valve parts. At this time, you can add appropriate lubricating oil, and then test, 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