You want the mule drive pulleys to be even across, not one ahead of the other and no slack in the belt, it should be pretty tight. If the belt slips as you are using it then tighten each pulley equally till the slipping stops.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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