[R129 SL] Re: R129 service DVD and Hydraulic problems

[Lowanover at aol.com]

Hi Jan,
I also have the factory R129 dvd which in an earlier post I offered copies  
to anyone who has experienced ADS (adaptive Damping System) problems. I would  
extend that offer to those that have had experience with the hydraulic self  
leveling suspension, as that may be the culprit. It is a complicated system,  
that is difficult to troubleshoot. The dvd does have quite a lot on it, but I  
have not been able to fix it yet. The dealers solution is to keep replacing  
parts until it works. 
 
This system is standard on the SL600, but my understanding is that was also  
available on the Sl500. I have replaced the accumulators and there are no 
leaks,  everything seems to work, but there is a loud hydraulic "squealing" noise 
when I  start it up that sounds like the system is pressurizing. After a short 
while it  changes in intensity and pitch and goes away. sometimes I hear it 
doing this  while driving. Is this normal? Any experiences would be very much  
appreciated.
 
As someone who has bought a number of workshop cd's off eBay, I would also  
add a word of caution....most are useless. I also have the original factory 
W124  cd's (2) which are also very good. But the rest were a waste of  money.
 
Dave
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