How do you adjust the tension on the power steering pump belt of a 1987 Oldsmobile Cutlass Supreme 305?

The adjustment bolt is very hard to get to. It is at the top of the pump just behind the Pully. You will have to slip a 15 mm open end wrench in from the top. You're only going to be able to get about a sixth of a turn at a time . You probably have a double pulley and the front groove has a belt that goes to the alternator on it. You will have to loosen the alternator first, adjusted pump, and then readjust the alternator. That's not a 305 Engine, that is a 307 engine. Y engine code in a Cutlass Supreme, 9 engine code in a 442. I just changed this belt yesterday. :-)