American Dryer Corp. MDG30V - Manual (Page 47)

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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.
T. Excessive noise and/or vibration...
1. Dryer is not leveled properly.
2. Impellor (fan/blower) is out of balance...
a. Excessive lint build up on impellor (fan/blower).
b. Failed impellor (fan/blower).
3. Loose basket (tumbler) tie rod.
4. Basket is out of adjustment or adjustment bolts (hardware) are loose.
5. Failed basket (tumbler) support.
6. Loose motor mount.
7. Failed idler and/or basket (tumbler) bearings.
8. V-belt(s) is either too tight or too loose.
U. Main burners are burning with a yellow flame (for gas models only)...
1. Burner air shutters are out of adjustment.
2. Insufficient make-up air.
3. Dust and/or lint in burner.
4. Insufficient gas pressure.