Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Does the right arm have same feel as the left? Follow the right linkage back to the transmission and see if the linkage may have come loose.
The two transmissions use a common belt, so it will not be belt problem or it would affect bot transmission. If not the linkage, could the free wheel lever on the left side be pulled?
Yes, freewheel to allow mower to roll free. That seems to leave only the transmission! One last thing to check is the wheel hub to the axle connection. Could the wheel be spinning on the axle shaft? f wheel was spinning, you lose the drive on that side.
Did you find problem?