Yes, the timer is what you are turning when you manually rotate the dial. Ordinarily, the internal motor of the clock inside the timer will do all the turning so you don't have to stand there
Ok, so now you have to remove the knob so you can inspect the gear teeth under the knob where it is supposed to mesh with the dial pointer. Open the console as mentioned above, pull out on the small round pin on back of the timer to release the knob in front. There are matching teeth on the dial pointer which also need to be looked at. Let us know which are worn, or both, and we'll provide a solution.
Would it help if I posted pictures and/or video (just to make clear what I'm saying, in case it's ambiguous, and to help figure out what "style" of knob assembly it is)