I think you can keep using that deck, but you might want to swap out the mule drive for one with the tilted idler pulleys. These mule drives are interchangeable with the Quiet Line tractors, but on the QLs the idler pulleys direct the belt to the off center main drive pulley on the deck. If the deck cuts nice, I'd keep it. Alternately, you can "adjust" your current mule drive pulleys to work with a heat wrench. Otherwise the belt will wear out faster and may jump off the idlers.
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