American Dryer Corp. Gas DSI/Electric/ Steam AD-78 II - Manual (Page 67)

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3. Loose basket (tumbler) tie rod.
4. Failed basket (tumbler) support.
N. Excessive noise and/or vibration...
1. Dryer is not leveled properly.
2. Blower (impellor/fan) is out of balance...
a. Excessive lint build up on blower (impellor/fan).
b. Failed blower (impellor/fan).
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 blower drive bearings.
8. V-belts too tight or too loose.
9. Bearing setscrews (either basket [tumbler], idler, or blower shaft) are loose.
10. Failed motor bearing.