Try adjusting the idler pulley on the mule drive along with the "L" shaped piece that ride against the belt. The "L" shape piece should just lay against the belt, and should not be tight. Apply the mule drive so that there is tension on the belt, and set the "L" shaped piece so that is just touches the belt, then tighten the nut. I'd also check the tension spring that goes between the mule drive and the front axle. These springs wear out and yours might need replacement.
Do your adjustments to the mule drive belt first, then run the mower to see how it performs. If the belt still slips, then I'd replace the tension spring. I forgot to mention, the idler pulley on the mule drive should be keeping the belt tight when the pto is activated. When not activated, the mule drive belt should not be turning. Check to make sure your tension is set correctly for the idler pulley, since you said your mower deck blades still turn when the pto isn't activated.
This would be so much easier to explain in person. Just where is Kittanning located in PA anyway? We should just meet some Saturday, and then I could show you all the in's and out's of these old round fenders.
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