Excellent info wish all post would start off like this. The first two digits of the s/n are your series number a Series 16 machine I’m an owner no expert and will try to help.
I assume you have the Service Manual but just in case.
FAV6800A/FAV9800A Service Manual for reference. Sears Parts Direct for reference.
“”I can grab the drive belt and effortlessly move it back and forth-pulley spins and motor spins--Should it move like this?””
There should be slight resistance.
With the front cover off and be careful of the rotating drive belt can you start a Spin Only cycle?
Do you see the Motor rotate the Clutch Pulley assembly CCW? If so the wash basket should spin CCW just raise the washer top and verify the CCW/Spin rotation.
If that works again with the front cover off start a Quick Wash cycle min Soil/Spin settings and observe as the washer. As it fills the wash basket will be rotating CCW don’t raise the washer top to high or you will spray water around.
After the water fill the washer will start to Wash/Agitate. The Motor will rotate the Clutch Pulley CW and the Tumblers will rotate. Do you see this action.
You can go into Service Mode with this procedure and dump the wash water if the cycle fails with this procedure.
I would go to page 16 of the SM lower right hand part of page, Board Output Test
and turn on the drain pump in service mode to pump out the tub.
Enter Service Mode by simultaneously pressing and holding the Enviro Plus
and Spin Only
keys for three seconds or the display reads “00”
Pressing the Delicates
key will lock the lid. Now press the Presoak
the drain pump will turn on. Stop with off
button or hit the Presoak
Thank you again for the Model number and Serial number…. other readers this is how you post an issue.
Waiting for your feedback………Rich