Steel Grease Fan
10
PROBLEM
CAUSE
CORRECTIVE ACTION
Excessive
noise or
vibration
Wheel rubbing inlet
Adjust wheel and/or inlet cone. Tighten wheel hub or bearing collars on shaft.
V-belt drive
Tighten pulleys on motor/fan shaft. Adjust belt tension. Align pulleys properly,
see page 6, Figures 10 and 11. Replace worn belts or pulleys.
Bearings
Replace defective bearing(s). Lubricate bearings. Tighten collars and
fasteners.
Wheel unbalance
Clean all dirt off wheel. Check wheel balance, rebalance in place if necessary.
Belts too tight or too loose
Adjust tension, see page 6, Figures 12 and 13.
Wheel improperly aligned and
rubbing
Center wheel on inlet, page 6, Figure 8.
Loose drive or motor pulleys
Align and tighten. See Pre-Starting Checks, page 6.
Foreign objects in wheel or
housing
Remove objects, check for damage or unbalance.
Fan base not securely anchored
Secure properly.
Motor hood loose and rattling
Tighten fasteners to secure motor hood.
Defective or loose motor
bearings
Replace motor with same frame size, RPM-HP.
High
horsepower
Fan
Check rotation of wheel, see page 6, Figure 9. Reduce fan speed.
Duct system
Resize ductwork. Check proper operation of face and bypass dampers. Check
filters and access doors.
Fan doesn’t
operate
Electrical supply
Check fuses/circuit breakers. Check for switches off. Check for correct supply
voltage.
Drive
Check for broken belts. Tighten loose pulley or belts.
Motor
Ensure motor is correct horsepower and not tripping overload protector.
Motor
overloads or
overheats
Lubrication
Check for excessive or insufficient grease in the bearing.
Mechanical
Replace damaged bearing. Relieve excessive belt tension. Align bearings.
Check for bent shaft.
Belt slippage
Adjust tension or replace bad belts, see page 6.
Over/Under line voltage
Contact power company.
Incorrect wheel rotation
Check motor wiring, see page 4, Figure 3.
Wheel RPM too high
Check drives or slow down fan by opening variable pitch pulley on motor
shaft.
Undersized motor
Check motor ratings with catalog speed and air capacity chart.
Motor wired incorrectly
Check motor wiring to wiring diagram located on fan motor.
Reduced
airflow
System resistance too high
Check system: Proper operation of backdraft or control dampers, obstruction
in ductwork, clean dirty filters.
Unit running backwards
Correct as shown on page 6, Figure 9.
Excessive dirt buildup on wheels
Clean wheel.
Improper wheel alignment
Center wheel on inlets, see Pre-Starting Checks, on page 6.
Dampers closed
Inspect and repair.
Blocked duct/clogged filter
Clean or replace.
Belt slippage
Replace and adjust tension.
Speed to slow
Check for correct drives.
WARNING
Before taking any corrective action, make certain unit
is not capable of operation during repairs.
AVERTISSEMENT
Avant d’entreprendre toute action corrective, s’assurer
que l’appareil ne pourra pas fonctionner durant les
réparations.
Troubleshooting
