BGraceKelly

Hello, I recently was given an old Amaco electric potter's wheel no. 1-101. The wheel has not been used in a long time. The wheel head does not switch to the correct direction for throwing. There is also a knocking noise when the wheel is on. I have a basic diagram of the parts and wiring that came with the wheel, but can't figure out where to begin troubleshooting the problem. Any advice will be appreciated.