I have had the belt from the mule drive wedge itself between the double stack of pulleys on the center spindle before. Enough tension to keep the belt "in place," but not enough to spin the deck in any meaningful way. Quickly destroys the belt, too. Culprit was a piece of debris that the belt pinched into the v ov the pulley, making it jump. Worth giving a quick look-see.
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Ian
Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts.
family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub.
Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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