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How do I replace the front self propel gear assembly

@fire5758, Charlie, You did not state your model # so I will post more or less generic info. of what I have found on Toro gear assy. replacement. Good luck. I hope this helped you out, if so let me know by pressing the helpful button. https://www.manualslib.com/manual/443988https://www.youtube.com/watch?v=_sWrC7Pbhttps://www.youtube.com/watch?v=9Rh6H1jl