SPX Cooling Technologies MARLEY CLASS 800 - Manual (Page 23)

23
Troubleshooting
Trouble Cause Remedy
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.
Drain, flush, and refill Geareducer. See Geareducer Service
Manual. If still noisy, replace.
Gears Correct tooth engagement. Replace badly worn gears.
Replace gears with imperfect tooth spacing or form.
Unusual Fan Drive
Vibration Loose bolts and cap screws Tighten all bolts and cap screws on all mechanical equipment
and supports.
Unbalanced drive shaft or worn
couplings Make sure motor and Geareducer shafts are in proper
alignment 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.
Fan 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 build-up 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,
rebalance rotor.
Bent Geareducer shaft Check fan and pinion shaft with dial indicator. Replace if
necessary.
Fan Noise Loose fan hub cover Tighten hub cover fasteners.
Blade rubbing inside of fan cylinder Adjust cylinder to provide blade tip clearance.
Loose bolts in blade clamps Check and tighten if necessary.