If the outside blades are slowing down, the PTO belt (954-3003 or 954-9071, 5/8x88.5") is not the problem, it's the spindle belt which is 1/2" x 77.5". Do the spindles turn freely and is the tensioner free to pivot, does the tensioner pulley turn smoothly, and is the spring there and working? Do you have the belt routed correctly?
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