Hydropneumatic Suspension (HPF) Series 2

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I thought I might start a new thread to specifically focus on the W126 hydro (series 2) suspension. This differs from the 6.9 and W126 series 1 systems and features adjustable damping, stiffening through corners and self lowering at high speed. I have 2 privately imported cars featuring this very expensive option, one a 560SEL and the other a 500SEL. Unfortunately neither is fully operational, but I'm aiming to get the 560 one up and running soon(ish).

More info to follow as I track it down in my files...

dash-1.jpg

Federrate_HPF.jpg

HPF_Hinterachse.jpg

HPF_schema.jpg

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c107

and 111/116/126
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I would be interested in hearing about the recommissioning of this system. I never knew the S2 W126 already had these features. Your 560SEL has some interesting options with the full hydro and heated seats but manual climate control. Quite a good combo.
 
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The console pic is not of my car, although it's very similar. In some circles it's called HPFE. Not easy to get info, but here's some more pix found on the net that detail parts in the system (I wish I could read German or have it translated):


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And more:


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Full_Exploded_colour_Diagram_Gen2_system.jpg

HPF_E_Filling_the_suspension_system_2.jpg

HPF_level_control_knob.jpg

Level_control_system.jpg

Picture_105.jpg

SCAN0030.jpg
 
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Pity they're not in any particular order but I cant seem to select order when uploading multiple images.


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s-l225.jpg

s-l225_1.jpg
 
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This is just as much a quick reference thread for myself as anyone else! From what I can tell the part numbers on the HPFE struts are:

RF: 126 320 4113
LF: 126 320 4013
Rear (both the same): 126 320 4313
 

Michel

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Fascinating...
thanks for sharing
 
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Here's some more info...


SCAN0031.jpg

valve_block.jpg
 
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And PDFs too!
 

Attachments

  • Colour Diagram of Fluid Control.pdf
    159.6 KB · Views: 12
  • Diagram and pics of levelling valve fluid adjusters.pdf
    204.5 KB · Views: 12
  • Diagram of Struts.pdf
    51.7 KB · Views: 10
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This is a car I was chasing for various reasons but the owner was less than helpful. The car has now disappeared but I no longer need it (or any parts either).

560SEL pre update with full hydro still fitted:

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C62068_E7-_BDDD-4900-8974-5_D778670_D1_D6.png

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65_B78_DB7-_D81_A-49_F1-_B878-_B7_EAF374_E62_A.jpg

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Pity the hydro has been removed & it’s now modified. Pix supplied for after the link disappears:


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I just received a large package from Germany & finally have all the parts I need to get the 560 back on the road (apart from new cells). Plus I have another full S2 system earmarked for something else... ������������
 
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Haha I forgot about the last one I just posted in this thread!! Oh and I have 2 cars; Dora and and a green 500SEL which has been used for parts for many years by the PO.
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Very unusual colour combo:

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Last edited:
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These cars all have the high compression 300hp M117 and are very rare in Australia. I bet there’s few left worldwide. So here’s the latest count:

Dora is 1 of 4 known cars in the country that retains the S2 hydro suspension:

Silver, update grey interior split rear seats (Dora), VIC,
Impala Brown, Orthopedic front seats, NSW,
Navy, update beige interior, WA,
Grey, pre-update grey interior, QLD,

The other known cars in Australia with the HYDRO REMOVED are:

Blue/black update grey interior split rear seats, VIC,
Blue/black pre-update grey interior split rear seats ASR, ACT.
Navy pre-update grey interior, WA.

500SEL green, green cloth interior parts only, VIC.
 
Last edited:
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Here’s the other car from VIC:

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The ACT car:

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