American Dryer Corp. AD-115ES II - Manual (Page 58)

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U. Dryer is making scraping noise at basket (tumbler) area...
1. Check for object caught in basket (tumbler) or wrapper area.
2. Basket (tumbler) is out of proper alignment...
a. Check both vertical and lateral alignment.
b. Check gap between front panel and basket (tumbler)...setscrews may have come loose and basket
(tumbler) walked forward or backwards.
3. Loose basket (tumbler) tie rod.
4. Failed basket (tumbler) support.
V. Excessive noise or vibration...
1. Dryer is not leveled properly.
2. Impellor (fan/blower) is out of balance...
a. Excessive lint buildup on impellor (fan/blower).
b. Failed impellor (fan/blower).
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 or basket (tumbler) bearings.
8. V-belts either too tight or too loose.