Clean any debris around the wheel that isn't turning. Then oil it. If that doesn't work, take to repair shop. I see that this question was asked two years ago, so you must have resolved the problem by now. Let me know the outcome!
I Have A Craftsman Self Propelled Lawnmower. Usually Both Of The Front Wheels Turn Constantly. Today I Noticed That Only One Wheel Is Turning. In Other Words Only One Wheel Of My Front Drive System Is Working. What Is Wrong And Can I Fix It?
I bought one of these last year, new, and the self-propelled portion worked for approximately 5 weeks. My advice would be to tape a dollar bill to it then take it to the dump. The reason for the dollar bill is so you can say that you threw something away.
Your wheel is striped buy a new one
I have a self propelled lawnmower that the front wheels will only engage when I jig gel the throttle, Half of the time I have to push it. (my back!) It feels like the belt is slipping.
The gear on the inside of the plastic wheel is stripped. There is a metal gear that runs the plastic gear that is part of the wheel. Poor design