Power Steering Problem

[68keyblr]

I've had this problem ever since I replaced the power steering cylinder and control valve. When turning left or right, especially at slow speeds, the wheel shakes in my hands, kind of like a stuttering-jerky motion.

Would this be caused by a bad PS valve or bad cylinder? Or something else?

 

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Bump

 

[ForceFed70]

Actually, it sounds like the pump isn't building enough pressure. Especially at low speeds when the pump isn't being spun quickly. Could also be the belt slipping I suppose which would also result in low pressure.