Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Blades should not be locked with everything off! Can you determine if it is one blade or all? If one, the spindle bearing is likely bad, and the spindle needs to be replaced or repaired.
The belt needs to be slacked, and deck checked, it may not be the deck, but most likely it is a pulley or belt problem. If the electric clutch was locked, the blades would stay engaged!
looks like two belts by the parts link above. One may be off , jamming the other!
If clutch was locked, engine would start with load of the deck. I don't see that being the problem.
I think it is deck, and belts are likley issue. May be best to drop the deck!
Did you see my response? I see question is still open?