Drum won't turn. The pully became unattatched from the belt and we don't know where it goes

Belt should go around entire drum then around motor pulley (which is metal) and tensioner/safety pulley (which is the white pulley)

The other pulley is spring loaded it puts tension on the belt.
Pull the pulley back and the belt will slip ight over then release the tension pulley and your done!

If you have the belt down in the groove on the tub it won't work. The belt slick side goes to the drum and goes back like this:



I recently worked on one of these and took photos of the repair:

http://appliancejunk.blogspot.com/2011/09/old-maytag-dryer-belt-replacement.html

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

If the heater and blower work then th eprblem is with the drum turning system
This includes the motor ( which we will presume works because the blower does),the belt (Item #25 in the Cylinder, heater and bulhead diagram) and a spring and idler pully (Items 20 and 21 in the Base, Motor, and blower diagram)
Most likely problem is the spring broke releasing tension that halds the belt to the motor pully and drum. Second most likely is the belt has stretched.
You need to open the unit to determine where the problem lies.
Here are diagrams and parts listing for that machine.
Good luck!

http://www.searspartsdirect.com/partsdirect/part-model/Maytag-Parts/Dryer-Parts/Model-MCE8000AYQ/3048/0151200?searchedModel=MCE8000AY&blt=

SOUNDS LIKE YOU HAVE A PULLY ON THE MOTOR SLIPPING IF YOU CAN HEAR THE MOTOR RUNNING, BUT THE DRUM DOES NOT TURN. IF NOT THE PULLY, THEN THE BELT MAY BE SLIPPING IN THE PULLY, BUT THE PULLY IS TURNING. THEN A NEW BELT IS NEEDED. IN EITHER CASE YOU WILL NEED TO ACCESS THE MOTOR AREA TO SEE WHATS HAPPENING. MOTOR COULD BE NOT RUNNING, EVEN THOUGH YOU HEAR A HUM IN IT. BUT, MOTORS NORMALLY RUN LONGER THEN THE LIFE OF THE DRYER.

if you got oil on the belt or the part of the pully where the belt rides then the belt is sliping and wont turn the drum.

you will need to get the oil off of the belt or buy a new one and you will need to get the oil off the motor pully and the idler pully and if any oil is on the drum.

This is where I would start given the information you have given.

If you go from the top. The belt goes down the drum, between the drum and idler pulloy,under the idler then pull it over to the top of the motor pully and loop over it. When it comes out from under the motor pully it goes under the drum and over to the other side of the drum, and back up to the top of the drum. I hope this makes since.
Please rate solution if helpful

if it comes on and runs and has heat but the drum does not turn the belt is broken. To replace the belt unplug the dryer, remove the lint filter, remove the 2 philip head screws,with a stiff putty knife pry up in the top of the cabnet on the right and left to litf the top, disconect the door swithch remove the screw from each side and lift the front off romove the old belt the reinstall put new belt around the drum groove side toward the drum. put the idler pully in the slot closest to the motor be sure the tab is under the base and the 2 catches stit in the slot. now pull the belt through the idler pully and around the motor shaft. the reinsatll the front secure with the screws reconect the door switch,close the top, put the 2 screws back in where the lint filter goes then put in lint filter, plug in dryer and test.

There is no adjustment provided for lining up the pulleys.
If it comes off then there are a couple of reasons that come to mind,the belt is too slack, the belt is worn,the drum is out of alignment with the motor pulley, caused by worn drum bearings, the motor is loose, a loose drum pulley, or you are not lining the belt up properly, overloading can also throw the belt off.
Hope this helps.
Plz leave feedback.
Ta.

The belt goes around the pully so that the pully tension takes the slack out of the belt. Just like the serpentine belt on your car.