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to bleed you remove the cap and simply turn the steering wheel slowly lock to lock with the engine running...sometimes it takes a few times if the system is very air bound and frothy
is it a factory pump?
Filling And Bleeding Power Steering Pump - except CODE (487a) Active body control (ABC)- with CODE (979) Special protection version- with CODE (Z04) Light armoring- with CODE (Z07) Top protection
Shown On Engine 112
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Model 210 With Level Control (Tandem Pump)
NOTE: Under no circumstances should the power steering pump draw in air
1 Remove charge air distribution pipe cover together with cover above power steering pump2 Fill power steering reservoir up to approx. 10 mm below the upper edge of the reservoirNOTE: If necessary pull off air intake hose (47)
3 Start engine 2 to 3 timesNOTE: The steering system bleeds itself automatically.
4 When the engine is running, turn the steering wheel several times from lock to lock, meanwhile depending on the version filling up with MB steering gear oil or central hydraulics oil if necessary5 Check and correct oil level6 Check steering system for leaksNOTE: If oil level is too low, locate and rectify the cause.
7 Install charge air distribution pipe together with cover above power steering pump