Hello, i am new to the forum. I have a Craftsman GT3000, 917273070. with the high/low manual gear. I purchased it new and it seemed to run fine. One day i engaged the blades and it was smoking a bit then that went away. I disengaged the blades and then pushed on the clutch/brake and the mower slowed but would not stop, i could not shift into any gears as when i tried it made a noise and a bit of a smell. When i start the mower up in neutral there then shift into a gear it is fine but once moving it will not stop even with the clutch/brake totally pressed down. I checked and the brakes appear to be alright but wonder if it's an issue with the clutch?