Welcome to the ARF Phono forum.
1. Have you done dis-assembly and degreased all
the old grease in the changer ?
2. Have you dis-assembled and cleaned the motor ?
2.a. Have you replaced the old motor mount grommets,
if there are any ?
3. Did you cleaned the new idler/belts before installing ?
Did you clean belt pulleys (if any) ?
4. Have you cleaned the inside rim of the record platter ?
4a. Have you removed and cleaned the platter bearings ?
5. Here's the site you can get the manuals for free:
https://www.vinylengine.com/library/per ... luxe.shtmlHotwax