Power steering pump failure?

[dkraven]

Steering squeals and jerks at low rpm, especially when turning the wheel slowly. Was hoping the v belt was loose and tightened that. Then flushed the fluid hoping it was that. Still squealing. Could it be anything but the pump? Here's a slow mo video of the pulley stalling when the squeal happens.

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[MarineOne]

How old is belt and clean rust off pully. That definitely is a contributing factor

 

[dkraven]

Belt is in decent shape and sure the pulley is pretty rusty, but would that cause the power steering to suffer? Also, realized I have this in the wrong section of the forum, sorry.