Any possibility the old waterpump/pulley had a flange at the side of the pulley to limit the belt's movement, or a tightener did and something is now different in those areas?
Another cause could be there's something wrong with the waterpump and it's shaft isn't EXACTLY perpendicular to the mounting face or the edge of the pulley isn't exactly the same distance from the pump's mounting face. If the tightener was replaced, could it possibly not be "true" walking the belt to the side? Do you the old parts to compare/measure?
It's even POSSIBLE the new belt is defective/has broken cords/was damaged being pried into place, making it "walk" to the edge of the pulley rather than run "true" and stay in place.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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