Whining/Groaning Power Steering Pump - Page 2 - Mercedes-Benz Forum
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post #11 of 15 (permalink) Old 05-09-2019, 07:18 PM
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I have a similar noise--more of a whine--that I think is coming from the PSP on my 74 450SL, but it goes away once the car is warmed up. Could this be the same thing?
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post #12 of 15 (permalink) Old 05-10-2019, 01:40 AM
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Originally Posted by rcrmonte3 View Post
I have a similar noise--more of a whine--that I think is coming from the PSP on my 74 450SL, but it goes away once the car is warmed up. Could this be the same thing?
Just like my pump was .But after the removal of old fluid and filled with the right oil the noise as gone if its hot or cold .But do use the right PAS fluid lots of owners think its ATF fluid and its not .

This is a retro ride .
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post #13 of 15 (permalink) Old 05-13-2019, 05:18 PM
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They think it should be ATF because that is what the owners manual states. I have looked manuals for '72, early '80s and an 86. As others have stated modern ATF may contain harmful additives.
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post #14 of 15 (permalink) Old 05-13-2019, 10:12 PM
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If it whines and groans too much you have two choices.. 1 Replace it or 2 marry it.

I replaced the fluid in mine and it's quiet but it's also weeping out of the steering box.
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post #15 of 15 (permalink) Old 05-15-2019, 03:11 PM
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I've had similar experience after the car's been parked up for a few weeks, when I pulled out from the garage and turned the steering wheel I thought the PSP was on the way out. Went for a spin, and all was good afterwards - as okyourabeast noted those cars don't like stagnating, use it or lose it 🙂
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