Harmon Kardon T60C Turntable issue

I pulled out my HK T60C turntable which had been in the attic for the last 15 years. The belt was melted which I replaced but the speed seems to be stuck on 45rpm. I took it apart and cleaned the contacts but still no luck.
I thought it might be the new belt but it appears to me that drive spindle is not adjusting speed. Any thoughts