Just did mine (again) yesterday because I was checking wheel alignment with alignment pin in the gearbox.

Remove filter from power steering, remove cap. Jack car up, open the drain plug on the gearbox. Fluid will not exit until you turn the wheels to the left and then to the right. Turkey baster to remove rest of power steering fluid.

Seal it back up, service manual says to fill it 10mm above fill line. Get power steering fluid nearby and ready. Start car, immediately check your level and fill. Don't let it go all the way down. Turn left and right check again.

Yes, very important to not turn wheels on ground without power steering activated. It puts stress on the expensive rubber couplings which can crack and loosen the tightness of the steering feel.

BTW - I had ATF in my pump. Did a Gearbox rebuild, refilled everything with clear power steering fluid. the resulting fluid was "pink". With yesterday's second fluid swap, fluid is slightly pink.

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Theseus

Instragram: doss_project
1984 300SD - 930 Blue, OM 617
Murfreesboro, TN

Theseus owned a ship in Greek mythology, and when a part of the ship needed replacing, it was replaced. Eventually, everything was replaced. Is it the same ship? (I own the car of Theseus. )

modern ATFs have been known to cause issues in some old steering systems askng for ATF, Some ATFs are pretty good with that - like the swepco HD ATF, however you can still buy amber/yellow mercedes power steering fluid pretty much at every dealer parts counter and also at NAPA.

I have also found factory GM/AC-Delco power steering fluid to be very good, it even got rid of some chronic noisy power steering systems with very old pumps. This fluid is usually only found at chevy dealers.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)