Like Jim said, check the bottom of the pulley grooves for belt contact. There should only be contact with the sides, not in the bottom.
Also look for even wear inside the pulleys, could be a bent or separated (broken weld) pulley.
Check the bottoms of the pulleys for any thing that doesn't belong. Once had a mower that would throw the belt. Found a chunk of bark wedged down in the vee. Had to dig it out with a screwdriver.
If all else fails try the factory belt. Something magically mysterious about them!
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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