The '86 560SEL does not have a belt driven hydraulic pump for the suspension, the pump is bolted directly to the block (about under the distributor) and is internally driven. The device you noted on the passenger side, if it was low in the bay was likely the air pump (smog equipment used only during cold engine operation).
My guess is it's anything but a 560, just misbadged.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.