I haven't used my tractor for several months. I have started, and let it warm up every now and then. I needed to use it the other day, and when I started it and pushed the clucth to put it in gear the clutch did not disengage. I have a manual, but it says nothing in the trouble-shooting about this. Can anyone help me with this problem. I noticed there is a bolt on the bottom of the clutch housing. Is this some kind of inspection area. Thanks