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Mower deck drive pulley

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I have a 725 with a 42" deck on it. I see on the pto on the bottom of the tractor (I think its called a Mule drive?) there is two pulleys. My mower deck is attached on the smaller of the two pulleys. I would like to use the larger pulley so it spins the blades a little faster on the deck. I would like to know what size belt I need for the larger pulley. The belt I have on the smaller pulley is a 44" i think, and it doesn't work on the larger pulley, I already tried that. Its so tight that the deck is engaged all the time.

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