SPX Cooling Technologies MARLEY MH MHF702 User Manual page 33

Troubleshooting
Trouble
Geareducer noise. (If
equipped).
Unusual fan drive vibration
Fan noise
Scale or foreign substance in
circulating water system
Cold water temperature too
warm.
See "Tower Operation."
Excessive drift exiting fluid
cooler
Cause
Geareducer bearings
Gears
Loose bolts and cap screws
Unbalanced drive shaft or worn couplings. (If
equipped)
Fan
Worn Geareducer bearings. (If equipped)
Worn fan shaft bearings. (Belt drive).
Unbalanced motor
Bent Geareducer shaft. (If equipped).
Blade rubbing inside of fan cylinder
Loose bolts in blade clamps
Fan shaft bearing. (Belt drive).
Insufficient blowdown
Water treatment deficiency
Entering wet bulb temperature is above design
Design wet bulb temperature was too low.
Actual process load greater than design
Overpumping
Fluid cooler starved for air
Distribution basins overflowing
Faulty drift elimination
remedy
If new, see if noise disappears after one week of operation. Drain flush,
and refill Geareducer oil. See Geareducer User Manual. If still noisy,
replace.
Correct tooth engagement. Replace badly worn gears. Replace gears
with broken or damaged teeth.
Tighten all bolts and cap screws on all mechanical equipment and
supports.
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 Driveshaft User 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 User Manual.
Clean off deposit build-up on blades
Check fan and pinion shaft endplay. Replace bearings as necessary.
Check fan shaft endplay. Replace bearings as necessary.
Disconnect load and operate motor. If motor still vibrates, rebalance
rotor.
Check fan and pinion shaft with dial indicator. Replace if necessary.
Adjust cylinder to provide blade tip clearance
Check and tighten if necessary.
Grease bearings.
See "Water Treatment" section of this manual.
Consult competent water treating specialist. See "Water Treatment"
section of this manual
Check to see if local heat sources are affecting fluid cooler. See if
surrounding structures are causing recirculation of tower discharge air.
Discuss remedy with Marley representative.
May have to increase fluid cooler size. Discuss remedy with Marley
representative
May have to increase fluid cooler size. Discuss remedy with Marley
representative
Reduce water flow rate over fluid cooler to design conditions.
Check motor current and voltage to be sure of correct contract
horsepower. Repitch fan blades if necessary. Clean louvers, fill and
eliminators. Check to see if nearby structures or enclosing walls are
obstructing normal airflow to fluid cooler. Discuss remedy with Marley
representative.
Reduce water flow rate over fluid cooler to design conditions. Be sure
distribution water basin nozzles are in place and not plugged.
Check to see that integral fill. Louvers and eliminators are clean, free of
debris and installed correctly. If drift eliminators are separate from fill,
make sure they are correctly installed and in place. Clean if necessary.
Replace damaged or worn out components
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