Small Engines (Lawn Mowers, etc.): Front wheel drive problem, craftsman model, shear pin

Question
My Craftsman model 917.377300 front wheel drive has stopped driving. I would like to know what troubleshooting I can do to determine the cause.
The wheels turn freely when disengaged, the lever engages, but the wheels won't turn automatically when engaged. They still turn freely.
Thanks.

Answer
You will have to remove the drive mechanism cover and determine where the break in the transfer of power occurs.  Because Craftsman uses many different manufacturers, I point you in any specific direction without seeing a picture of the drive assembly.  It could be as simple as a cable adjustment or a sheared shear pin.