self-propelling just stopped Lawnboy 10684
2005 Lawnboy 10684 - I was just mowing tonight and the self-propelling just stopped half-way through. When I hold the lever down, the motor sounds like it's trying to send power to the wheels, but nothing happens.
The wheels won't roll backwards either - they roll forward, but just lock when pulling back. What is my 1st step to start repairing and figuring out what the problem is?