"spin cycle"?

I have an older Inglis Model EO44100 Washing machine.It will not go to "spin cycle". I can hear that the relay is activated electrically from the control when it times to that position and hear it release and then contact again when I open the lid to see if it is spinning (It only hums when in the spin cycle in any of the timed washing positions) but want to know what positiion the shifter on the transmission will be to cause "spin cycle" ??? Or maybe it is electrical ???? Thanks and any picture or whatever else you can offer up to help explain would be great.