Our MayTag dryer was making a loud rattling noise whan it was on. I found out that it was probably the wheel fan. I took the front door off and got to the wheel fan (or blower fan) and sure enough the middle of the fan was stripped (or rounded) I replaced it with a maytag fan of the same part. It turned fine now. However, In placing the door back on, the drum is not free tuning now. In order to get to the fan I had to unscrew the holders for the drum. I could not see what was causing the friction. Maybe there is a belt behind the drum. Yes, I have all the screws. I used to take aprt Electronic Radar unit in the USN. Any help would be appreciated. I'm out of my experience level. :-)

I f your dryer is noisy, check these:

Rollers
Idler pulley
Glides
Rear drum bearing
Blower wheel
Rollers Many dryers use rollers or wheels to support the clothes drum. When these rollers are worn, they can be noisy. You should replace the whole set of rollers at the same time.

Idler pulley Dryers have a tension or idler pulley that keeps tension on the main drive belt. When it's worn, it can be noisy. When that happens, don't lubricate it. Just replace it.

Glides Many dryers use nylon or plastic glides at the front of the clothes drum for support. When these are worn, they can be noisy. When that happens, replace them.

Rear drum bearing Some dryers support the clothes drum in the rear with a center spindle instead of rollers. The spindle may be a ball-and-socket type support or a shaft through a sleeve. When the components are worn, they may squeak, squeal, or rub. You can't repair them. Just replace them when they're worn.

Blower wheel Your dryer's blower wheel pulls air over the heat source, through the clothes drum, and past the thermostats, then pushes it out the exhaust duct. The blower wheel, which is usually plastic, may wear out over time. But if it's noisy, it may simply be clogged with lint. Clean the blower and test to see if the dryer is still noisy. If it is, you probably need to replace it.

Reinstall the fan in the proper way, check that wiring harness and connectors have no bad contact.