Kenmore Series 70, does not go into spin cycle?

What part do I need to replace when it goes from wash to spin/drain it clicks 2-3 times and then does not do anything. I cannot hear anything at all, no pump, nothing. If I put the drain hose outside, it will drain, and I move the knob to rinse, and it will fill up and agitate, but when it should spin and drain again, it clicks 2-3 times and shuts down. Where kind I find the switch or whatever part to replace to fix.