Hi! It's been a while...
We have a Whirlpool Gas Dryer (Model WGD5620HW) that started squealing or screeching during operation. I cleaned out the entire interior and then cleaned and oiled the pulley wheel. The belt looked slightly frayed in one small section and the pulley wheel had gone almost completely stiff. Re-assembled and worked fine for one or two loads but then again the squealing and screeching at times.
Disassembled again. Pulley wheel was stiff again. This time I replaced the belt with a new one and cleaned and oiled the pulley wheel and all the roller wheels.
Re-assembled. It worked fine for two loads and then the squeaking started again - first subtle and then screeching.
Felt liners look ok.
What am I missing?