With a wrench or ratchet...........
There should be a through bolt that runs front to back
Another one on the front and another one on the back.
They can be hard to see, But they should be there.
Don't pry on the can/reservoir.
Clean the area between the filler and the block with some mineral spirits. Mine gets filthy. The bolts are 15mm on my 84. Curse it every time I have to do it. Only metric on my jeep. There is a square hole in the back of the mount just up from the return line. Use a ratchet or breaker bar to move the pump. Its backward from what you'd think. Up to loosen.
One 15 mm bolt under the top of the pulley, one in the same place behind the pump. These are the pivot bolts, then one long one down in the center of the plate toward the engine which is the adjuster/locking bolt you loosen. To tighten it, use a socket wrench in the square hole on the back as mentioned, then tighten the long locking bolt first, then the two pivot bolts but don't go too tight on the belt.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
As always, this forum solves problems and saves money. I spent the morning replacing my water pump and ran in to the same issue with loosening the power steering belt. It was not obvious but with an iPad and the jeepforum.com the problem is solved. I attached a photo to help others 'see' where the two bolts are that must be loosened to pivot the pump. A socket is on both of them for your reference. Both are 9/16. Hope this helps someone.