I'm trying to repair a Frigidaire Commercial dryer Model #GLER341AS2. It's making a droning sound after about 3 minutes of heating and starts this awful grinding/scraping sound. The longer it runs, the worse it gets. It sounds like the noise is coming from the rear part of the drum.
I checked the rear bearing. It didn't look to be worn out but I installed a rear bearing kit and drum ball anyway. I lubed it well and I still had the same problem.
I've checked the idler roller and belt. I disassembled the idler roller polished the shaft, and lubed with machine oil before reassembly.
I reluctantly replaced the motor. I cleaned and checked the blower wheel and blower housing while I had everything apart. I still have the same problem.
I removed the rear baffle on the drum and the noise stopped. I was concerned that the unit would overheat if I ran it very long with the baffle removed.
I reinstalled the baffle and removed the heating element with pan. No heat but it didn't make any noise. I noticed that the element and insulators make a tinny, metallic, rattling some if you bump the pan with your hand. All of the insulators are in place and the element is is in place, clipped to the insulators. I've considered replacing the heating element with pan but I don't really see a problem with this one.
The felt seals are worn a little and the drum glides look ok. I cut a strip of thin cardboard about 1 1/2 inch wide and 24 inches long. I worked it between the top of the felt seal and drum glide. The noise continued.
I've looked everything over and can't find where anything is worn or rubbing.
I see some videos on YouTube where they are checking out a Frigidaire dryer with the same noise. They check thr rear bearing, idler roller, belt and drum seals/glides. All look good and they say the motor must be defective. I beg to differ.
I would appreciate any info you could provide to help me fix this problem.
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