try unhooking the cable{shift ] and moving the link by hand if it works then you know it is in the cable but if not open the linkage inspectin widow on the foot to see if the brass connecter as moved or not if thats not the problem then the pin in the foot that holds the shift fork might have broke or is worn out ,also there is a pin under the [power head that connects to the shift handle that my be damaged[ hope the will help you find you problem bill