Why does my power steering pump squal when I turn?

I have checked the fluid and it fine… It is a 2000 ford ranger with 4.0 V6 engine. It has a 3 inch body life and oversize mud tires… Would large tires cause it to whine? Or do I need to just change my pump?

The pump is probably worn. Its 15 years old.

I think that might be the serp. Belt squealing, but I'm not familiar with that make and model. When that was happening on my older car, which was a Merc. Sable, it was not long after that that my power steering pump when out.

Check the Belt for Condition & Tightness… It " squeals " because the belt is slipping