Filter
Top Products
23
Troubleshooting
RemedyCauseTrouble
Wrong sequence of phases
Geareducer bearings
Gears
Loose bolts and cap screws
Unbalanced drive shaft or worn cou-
plings
Fan
Worn Geareducer bearings
Unbalanced motor
Bent Geareducer shaft
Loose fan hub cover
Blade rubbing inside of fan cylinder
Loose bolts in blade clamps
Switch any two of the three motor leads.
If new, see if noise disappears after one week of operation.
Drain, flush, and refill Geareducer. See Geareducer Service
Manual. If still noisy, replace.
Correct tooth engagement. Replace badly worn gears. Replace
gears with imperfect tooth spacing or form.
Tighten all bolts and cap screws on all mechanical equipment
and supports.
Make sure motor and Geareducer shafts are in proper align-
ment and “match marks” properly matched. Repair or replace
worn couplings. Rebalance drive shaft by adding or removing
weights from balancing cap screws. See Drive Shaft Service
Manual.
Make certain all blades are as far from center of fan as safety
devices permit. All blades must be pitched the same. See Fan
Service Manual. Clean off deposit buildup on blades.
Check fan and pinion shaft endplay. Replace bearings as
necessary.
Disconnect load and operate motor. If motor still vibrates, rebal-
ance rotor.
Check fan and pinion shaft with dial indicator. Replace if neces-
sary.
Tighten hub cover fasteners.
Adjust cylinder to provide blade tip clearance.
Check and tighten if necessary.
Wrong Rotation (Motor)
Geareducer Noise
Unusual Fan Drive Vibra-
tion
Fan Noise