You should not hear any noise from your power steering pump, with the exception of holding the steering wheel hard at the wheel stops and then its only normal to have a very slight growl. Sounds like it is time to replace that pump.
90 YJ 5.2 Magnum, AX-15, 231 SYE'd
D44 front, welded/trussed AMC20HD rear. 4.56 gears soonish.
Western 6 lug aluminum wheels, with 35x12.50x15 Wrangler MTRs