I can't pull the string its like the motor is locked up but its not.
Troy bult smart touch sp push mower

Hi,
Probably the gear on the SmartTouch system wedged in the flywheel.
Peace,
Clarke

You might look under it make sure the blade isn't hitting any thing.
Always undo spark plug
Safety first.
Luck
Lay it on the side oppisite of the carb.other wise oil will run out the carb.