Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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The first thing that I would check is to make certain that the linkages are all still connected going from the drive control levers to the transmission, then I would look at the wheel hub to the axle to make certain that nothing is loose there. If you find no issues with those two items then you would have an internal issue with the transmission and the only way to fix it is to remove the transmission and either rebuild it or replace it.
There is only one belt that drives both transmissions therefore if the right side is working okay then it tells me that it is not a belt issue.
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