XM Hydractive

Below is some (very) technical information on the XM Hydractive I and II suspensions systems.

A fault finding guide for the Hydractive I system in English (34 kb Word file)
This was written by John Davidson and published in The Citroënian (Journal of the UK Citroën Club) in August 1996.
Description of the Hydractive I system in German language (2.57 Mb PDF-file)
This is official documentation from Citroën.
Description of the Hydractive II system in English language (213 kb PDF-file)
This was written by Zeljko Nastasic (better known as Z on the XM-L mail-list)

The hydractive II system was introduced starting from ORGA number 5929, i.e. starting from february 1 1993, as you can see from the following two images (scans from Citroen microfiches):

Central spheres until Orga number 5928

Central spheres starting from Orga number 5929