Check below exploded view of Aiwa PX-E860 might help you to install belt.
Need further help, let me know. 
Belt will put on motor pulley and its indicated in Blue color vertical line in below picture.
You can locate Motor easily as indicated here. Belt is assumed as Red color line.
I can understand if this unit is in front of me, but now I have to assume the problem based on info from you. Can you post pictures pointing what exactly problem is? 
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To replace a drive belt.
1, Remove the rubber platter mat to expose the platter.
2.
Put your thumb and forefinger through the two round holes and lift the
platter off. You may need to give the centre spindle a light tap
(whilst applying upward pressure) with a screwdriver handle or some
similar tool that will not leave any marks or damage.
3. Remove the old belt and wipe the platter pulley and motor pulley with an alcohol swab to remove any old belt residue.
4. Place the new belt around the platter pulley making sure t is sitting flat without any twists.
5. Flip platter over the right way up. There are1or 2 larger rectangle shaped cut outs in the platter.
6.
Through the cut out pinch up the belt and slip a finger or belt hook
between the platter pulley and the belt gripping the belt ready to fit
over the motor pulley.
7. Align the centre hole of the platter with the spindle and place platter back into position keeping a grip on the belt.
8. Slip belt over motor pulley and give the platter a light clockwise rotation to ensure the belt is riding correctly.
9. Replace the rubber mat and then run the turntable to ensure correct operation.
Job done. John styluscity.com
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thank you for trying to help but I couldn't see where the belt actually attached to and what its attached to. I can see its attached to a spindle that spins as soon as I plug in the M/C but what else its attached to I don't know. Maybe you can explain to me in words of an e-mail instead of a diagram. I will be very grateful. Thank you.
I need a diagram showing how to re-install the belt, since I removed it completely. Does it go around the main gear? This is also for the aiwa PX-E860U (same unit).
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