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belt size , number - inches (7117)

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What would be the belt length or number for mower belt on a 1979 7117 ? ( the belt that goes from pto to mower deck? Also I have a belt that came with tractor and the no. is 1666324 ,any idea what it is used for?

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PTO Belt with 42" deck is #1666801 = 80.75" HA PTO Belt with 48" deck is #1713515 = 78.1" HA The #1666324 belt is used for the Drive Belt for the 400 Series AC tractors with 36" and 42" snow throwers.

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