SPX Cooling Technologies MARLEY MH MHF702 User Manual - Troubleshooting
33
Troubleshooting
Trouble
Cause
remedy
Geareducer noise. (If
equipped).
Geareducer bearings
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.
Gears
Correct tooth engagement. Replace badly worn gears. Replace gears
with broken or damaged teeth.
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. (If
equipped)
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
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 User Manual.
Clean off deposit build-up on blades
Worn Geareducer bearings. (If equipped)
Check fan and pinion shaft endplay. Replace bearings as necessary.
Worn fan shaft bearings. (Belt drive).
Check fan shaft endplay. Replace bearings as necessary.
Unbalanced motor
Disconnect load and operate motor. If motor still vibrates, rebalance
rotor.
Bent Geareducer shaft. (If equipped).
Check fan and pinion shaft with dial indicator. Replace if necessary.
Fan noise
Blade rubbing inside of fan cylinder
Adjust cylinder to provide blade tip clearance
Loose bolts in blade clamps
Check and tighten if necessary.
Fan shaft bearing. (Belt drive).
Grease bearings.
Scale or foreign substance in
circulating water system
Insufficient blowdown
See "Water Treatment" section of this manual.
Water treatment deficiency
Consult competent water treating specialist. See "Water Treatment"
section of this manual
Cold water temperature too
warm.
See "Tower Operation."
Entering wet bulb temperature is above design
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.
Design wet bulb temperature was too low.
May have to increase fluid cooler size. Discuss remedy with Marley
representative
Actual process load greater than design
May have to increase fluid cooler size. Discuss remedy with Marley
representative
Overpumping
Reduce water flow rate over fluid cooler to design conditions.
Fluid cooler starved for air
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.
Excessive drift exiting fluid
cooler
Distribution basins overflowing
Reduce water flow rate over fluid cooler to design conditions. Be sure
distribution water basin nozzles are in place and not plugged.
Faulty drift elimination
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