I am working on a Toro Personal Pace (20074). I replaced the "bevel gear" on the output shaft of the transmission because there were a couple teeth broke off. The new gear is in but when I pull the mower backwards, every one turn of the axle, there is a sort of knock. Sometimes it binds and both back wheels lock up. I took all the wheels and gears off the transmission but it still binds. I don't see anything wrong with the gears in the transmission. But, it only seems to bind when the transmission cover is tightened down. When I hold the transmission together and turn it, it doesn't bind. Any ideas as to what could be causing this?
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