With the belt removed and the platter in place, does the platter spin freely or does it bind? If it spins freely, the problem is probably with the belt, which is to say that the belt is stretched and/or contaminated. Measure the belt. If it measures the right size, clean it as well as the pulley and hub. If the belt is too long (more than 5% longer than a new one), get a new one.
Update us.....
Regards
Jim
Update us.....
Regards
Jim