Maintenance & Adjustment
D760.H03E-001.H1907 189
Maintenance of air suspension
Air spring is a complicated system assem-
bly. It realizes the elastic effect by compressing
and stretching the air in the rubber bellows, so
its rigidity may change with the load. Compared
with the traditional leaf spring, it features lower
natural frequency, and has the ability to ensure
body height as load changes, and the advan-
tages such as long service life, light weight, etc.
Air spring assembly is mainly composed of
upper connecting plate, inner buffer block, rub-
ber bellows body and lower connecting plate
(usually called as the piston). Upper connecting
plate can be of mounting type or vulcanized top
plate type, and this vehicle model employs the
vulcanized top plate. Rubber bellows body is
composed of the external rubber protective layer and internal cord - rubber fiber rein-
forced composite layer.
Air pressure in the air spring should not exceed 100Pa/7bar, and the working
temperature of air spring should be -40ºC-70ºC.
1. Do not drive vehicles equipped with air spring suspension system on bad roads. It
is required to regularly check the shockabsorber for failure and if the levelling valve
is in proper position, as either shockabsorber failure or incorrect position of
levelling valve will result in air spring overstretching, causing separation of upper/
lower connecting metal plate from the rubber bellows body.
2. Rubber bellows body of air spring assembly may be corroded and damaged by
hydraulic fluid, lubricant and other chemical solvents. While driving the complete
vehicle, never let the rubber bellows body of air spring contact corrosive liquids;
check and clean the air spring regularly; and the cleaning can be done with clean
water only. And meanwhile, avoid too much oil in the air supply system.
3. If mixed with foreign matters during operation, the rubber bellows body may be
worn out as air spring moves up and down. Therefore, it is required to check and
clean foreign matters in the rubber bellows body regularly.
4. Do not use air spring assembly under no internal pressure.
5. Check the rubber bellows body of air spring for leakage due to scratching by
stones, metals and other sharp foreign matters, and replace it if necessary.
6. Check if air suspension system exterior stoppers are missing or damaged
regularly. Missing stoppers may cause metal installing parts, like air spring piston
base, to be damaged due to overloading.
7. Overloading of air spring is prohibited. Piston base may be crushed under
overload condition.
8. Normal fatigue crack of air spring assembly appears at the folded edge of bottom
piston. The rubber bellows body of air spring should be replaced every 3-4 years.
1. Upper connecting plate
2. Inner buffer block
3. Rubber bellows body
4. Lower connecting plate
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