You rotate the drum rollers looking for an eliptical outer surface rubber of the rollers. Also make sure the rollers do not teeter fore and aft on the roller shaft.
Next grab the idler pulley for the belt and see if there is any play in the ldler.
Worn drum felts / gaskets or a front bearing glide can also contribute to the problem
See this link for parts:
http://www.appliancepartspros.com/partsearch/model.aspx?model_id=47834&diagram_id=28471897#d28471897
Item numbers you need to check are
6, (unusual wear)
14, drum gaskets {2 ea front and rear} (torn, worn or folded)
18. Just replace the belt if your into it this deep..... especially if the dryer is +5 years old
23, (roller Shaft for wear)
24, roller for wear center and outside surfaces
30. Drum glides (Kit)
A rumble is usually associated with a bad fan blade...as in the center of the fan blade hub is cracked or broken. Check the fan for play.. also hold the motor drive pulley and see if the fan rotates on the motor shaft. It should NOT rotate without turning the drive pulley
A squeal is associated with the belt or idler pulley
A thump is a drum/felt/roller/glide problem.
Thanks for choosing FixYa,
Kelly
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