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AC 620 PTO Shaft replacement options?

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I have a AC 620 Hydrostatic tractor with the original PTO at the back and have been unfortunate enough 

to have it split open due to the rototiller spline not seated and locked into place. Does anyone have a replacement

for me or suggest a source? OR suggestions on circumventing the repair and modifying the PTO to drive  the

rototiller in another manner (Hydraulic?)







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