Troubleshooting
Trouble | Cause | Remedy |
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Wrong Rotation (Motor) | Wrong sequence of phases | Switch any two of the three motor leads. |
Geareducer Noise | Geareducer bearings | If new, see if noise disappears after one week of operation. |
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| Drain, flush, and refill Geareducer. See Geareducer Service |
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| Manual. If still noisy, replace. |
| Gears | Correct tooth engagement. Replace badly worn gears. Replace |
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| gears with imperfect tooth spacing or form. |
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Unusual Fan Drive Vibra- Loose bolts and cap screws | Tighten all bolts and cap screws on all mechanical equipment | |
tion |
| and supports. |
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| Unbalanced drive shaft or worn cou- | Make sure motor and Geareducer shafts are in proper align- |
| plings | ment and “match marks” properly matched. Repair or replace |
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| worn couplings. Rebalance drive shaft by adding or removing |
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| weights from balancing cap screws. See Drive Shaft Service |
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| Manual. |
| Fan | Make certain all blades are as far from center of fan as safety |
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| devices permit. All blades must be pitched the same. See Fan |
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| Service Manual. Clean off deposit buildup on blades. |
| Worn Geareducer bearings | Check fan and pinion shaft endplay. Replace bearings as |
|
| necessary. |
| Unbalanced motor | Disconnect load and operate motor. If motor still vibrates, rebal- |
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| ance rotor. |
| Bent Geareducer shaft | Check fan and pinion shaft with dial indicator. Replace if neces- |
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| sary. |
Fan Noise | Loose fan hub cover | Tighten hub cover fasteners. |
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| Blade rubbing inside of fan cylinder | Adjust cylinder to provide blade tip clearance. |
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| Loose bolts in blade clamps | Check and tighten if necessary. |
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