Shock Absorber Maintenance

Inspection

To rapidly dampen vibrations between the chassis and body, improving ride smoothness and comfort, automotive suspension systems are generally equipped with shock absorbers. Double-acting telescopic shock absorbers are widely used in automobiles.

 

Shock absorbers are wear-prone components in automotive use. Their performance directly affects ride stability and the lifespan of other components; therefore, they should be kept in good working order. The following methods can be used to check the performance of shock absorbers:

 

Shock absorber inspection includes performance testing, durability testing, and dual-excitation testing.

 

Indicator dynamometer tests, friction tests, and temperature characteristic tests are performed on various types of shock absorbers.

 

Repair
After determining that a shock absorber is faulty or has failed, first check for oil leaks or signs of long-term oil leakage.

 

Damaged oil seals and gaskets, and loose reservoir cap nuts may indicate a problem with the oil seals or gaskets; these should be replaced. If the oil leak persists, pull out the shock absorber. If you feel any sticking or uneven resistance, further check if the clearance between the piston and cylinder is excessive, if the piston rod is bent, and if there are scratches or scoring on the piston rod surface and cylinder.

 

If the shock absorber does not leak oil, check the connecting pins, connecting rods, connecting holes, and rubber bushings for damage, detachment, cracks, or loose parts. If the above checks are normal, further disassemble the shock absorber to check if the clearance between the piston and cylinder is excessive, if the cylinder is scored, if the valve seal is good, if the valve disc and valve seat fit tightly, and if the shock absorber's extension spring is too soft or broken. Repair by grinding or replacing parts as needed.