[RiceBox]

also you can put WD40 on it... if its tight enough the squealing is coming form the side of the belt running on the groove of the puley... spray it good, if it doenst stop change it !!

WD40 is probably bad for the rubber. Adjust the belt, if that doesn't work replace it. Another trick is to rub a bar of soap on the belt, it doesn't degrade the rubber but stops the squeeking.
Don't ask me why, but it works