note: you will have to jack or lift the engine out of the car a few inches to accomplish this.
I have my own aurora, and have been trying to do this myself. First, you will need to remove the belt. Then, you will need to locate the pump and get the pulley off. The Power Steering pump is located on the passenger side of the engine, near the top. The cap says "Power Steering Fluid" on it. The pulley for the pump is right below that, and is one of the larger pulleys... it's in plain sight. You'll need a pulley removal tool, because the aurora power steering pulley doesn't have holes for bolt-removal. You can remove the pulley without first lifting the engine, but it can be tricky, especially depending on the tool you use. Once the pulley is removed, there are two bolts on the far side of the pump, and towards the bottom. If you haven't lifted the engine yet, here is where you will need to. Both of those bolts act like hinge pins, and must be completely removed; however, you will only be able to remove one if you haven't lifted the engine. The mounting brackets will prevent further removal. They also make belt removal/replacement a severe pain at best. If you have the engine lifted, just make sure your main line and return hose are both disconnected, pull those bolts, and it will come right out.
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Search Wiki for 1998 Chevy Suburban power steering pump replacement, the author based his answer on a 1997. Enjoy
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If you are lucky tie rod (inner or outer) has to be replaced. If you are not lucky you will have to replace all steering mechanism (steering rack).
It's possible a seal has broken. Find where it leaks from, could be pump, hose or steering ram. Then replace part.