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There is only 1 pulley in most driers, so the idler and the tension pulley are the same part. The idler pulley is on the tension arm, located beneath the drum. A squealing sound is usually associated with the pulley. If it is a slapping or thumping sound it may be the belt, which goes around the drum and the motor shaft. The part numbers are on the parts, or you can order by model. The idler is less than $10.
It sounds like you didn't install the belt onto the idler pulley in the correct S-shape. The idler pulley should always keep the belt tight under spring tension (no adjustment screws).
Here is a video, and tho it is a completely different model, almost all dryer belts/pulleys are installed in this manner. You can skip to the 2:30 to 2:45 time frames, where it then shows exactly how to re-install the belt on the idler pulley.
its probably not the belt,rather the idler tensioner pulley that keeps the drum belt taught to turn the drum,replace both as long as you have to tear it down anyway part numbers are belt AP4324040 / tensioner idler pulley AP2043227 available from appliance parts pros 1-877-477-7278
On the bottom left side next to the motor you will see a small plastic wheel (idler pulley) which the belt is wrapped around. The wheel is attached to a L-shaped piece of metal which is known as an idler spring arm which is made out of spring steel.
Move the arm one way or the other and you will notice the belt tension getting looser. Push the arm further that way until you can get the belt off the pulley an motor. Use caution as the spring arm has torque on it and could snap back.
Once the belt is off the motor and idler pulley you can then pull the drum out. You will need to lift the drum up slightly since the back sits on drum wheels(the groove on the back of the drum). Take the drum and belt out together.
Once you have made the repairs, install the drum in reverse order.
Note: Before removing the belt, make a diagram of how the belt goes around the motor and pulley for future reference.
ALWAYS UNPLUG YOUR DRYER BEFORE ATTEMPTING TO DO ANY WORK ON IT.
Sounds like your problem may be a broken belt, or the belt may have slipped off of the motor pulley, or idler arm pulley. If you have to check/replace your drum belt and if you have a front loading machine. Remove the electrical console that holds the timer switch, start switch, etc. from the top of the dryer. Be real careful not to knock any of the wires off of the timer switch or other connections. Remove the lint filter screws and filter. Then remove the top of the dryer. Remove the front of the machine, this will expose the belt and drum, remove the drum and belt and this will expose the drum rollers, idler arm bracket with pulley, and motor with pulley. Pay attention to the route of the belt, this will come in handy when you go to reinstall the belt and drum. Sometimes the belt will slip off of the idler arm or motor causing the drum not to turn. While you have the drum out, I would recommend that you lubricate the drum rollers at the shaft of the roller with a good grade of machine oil like 3 in One oil. This will save you a problem later with the rollers getting noisy, also check your drum rollers for flat spots, if they have flat spots on them this will cause a noise like a thumping type noise. You will need to replace the drum rollers if they have flat spots on them.
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route the belt around the drum, pull the spring loaded idler pulley to the postion that requires you to hold it there..
put the belt : 1 through the motor pulley and around the idler pulley, or 2. around the idler pulley which ever works to keep the tensioner tight. (Idler pulley, tensioner same thing its the pulley not on the motor.
Once you put the belt on the durm, pull the idler pull so there is tension on it it should be clear how it goes.
The idler pulley controls the tension on the belt. Simply grasp the idler pulley located by the motor and pull in the direction of least restraint, then slip the belt off the idler pulley.
Make sure the power is disconnected to the dryer. Below is a link that will assist you with exploded diagrams and parts information.