95 Deville Concours power steering

My friend has a 95 Deville Concours and he heard a whining noise coming from the power steering pump so he replaced it with a remanufactured power
steering pump from Pep Boys. Now that the pump has been replaced, the power steering is harder to turn. Is there a bleed procedure or something else that he needs to perform after replacing the power steering pump? If there is, can anyone please tell us that procedure. Thanks for any help anyone can provide in helping us solve this problem.
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