American Dryer Corp. AD-27 - Manual (Page 50)

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3. Loose basket (tumbler) tie rod.
4. Basket (tumbler) is out of adjustment or adjustment bolts (hardware) are loose.
5. Failed basket (tumbler) support.
6. Loose motor mount.
7. Failed idler, basket (tumbler), or fan (impellor/blower) bearings.
8. V-belt(s) either too tight or too loose.
9. Bearing setscrews (basket [tumbler], idler, or impellor [fan/blower] shaft) are loose.
10. Failed motor bearings.