Removing power steering pump?

2007 MERCEDES BENZ S600
101,000 MILES • V12 • TURBO • 2WD • AUTOMATIC
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BHAMDOC1973
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I want to take a chance on this one. Removed belt and the pulley is a bit harder to turn that most pulleys are, not smooth, i think this is where the noise is coming from.
Aug 6, 2022 at 1:10 PM
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SQM
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Hello,

The pulley should have some resistance, but it will turn smoothly.
So, it is possible that the bearing is bad.

One way to determine where the noise is coming from is to use an automotive stethoscope (see picture below) and put it on the hub/shaft of the pulley when the engine is running. This can make it easier to determine the source.

I have attached the power steering pump replacement procedure below for your reference.

Let me know of any questions.
Thank you.

https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump
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Aug 6, 2022 at 1:51 PM
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BHAMDOC1973
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I checked and there was some from there but also from one of the belt pulleys, but the noise seemed like it was coming from above of the pulley on top left, area of the air check valve, but with belt off noise is gone.
Aug 6, 2022 at 2:11 PM
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SQM
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If the noise is gone with the belt off then it is likely a pulley noise.
Aug 6, 2022 at 7:01 PM