Checking condition of spring struts - AR32.25-P-1017-02T

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MODEL 211.0 (except 211.08/09), 211.2 (except 211.28/29) with CODE 489 (Airmatic (semi-active air suspension))

MODEL 212 with CODE 489 (AIRMATIC (air suspension with continuous damper adjustment))

MODEL 218 with CODE 489 (AIRMATIC (air suspension with continuous damper adjustment))

To ensure the satisfactory condition of the AIRmatic it is necessary to check the spring elements for damage prior to installation.

Front axle (spring strut removed):

It is possible to recognize unpressurized or low-pressure spring struts in that the shock absorber tube (1) is not firm in the outer guide (2), i.e. the shock absorber tube (1) can be moved to and fro in the outer guide (2) without much resistance (arrows).

Furthermore, it must be possible to feel the bellows (3) under the protective boot (4) and the bellows must form a full rolling fold. The protective boot (4) must not be damaged (e.g. cracks).

Unpressurized spring struts are scrap and must not be pressurized and fitted to vehicles under any circumstances!

Fig 1: Checking Spring Struts Condition

Courtesy of MERCEDES-BENZ USA