Just bought a 10651 self propelled model and while going over the cables i found that the gear selector will not move. The cable is free in the housing but the lever on the transmission will not move. This is my first Lawn Boy so i am unfamiliar with what i should be looking for. does the engine need to be running before the gear selector will move? I am at work so i can't start it here. i just picked it up on my lunch break.:help: