Problem Cause Corrective Action
Wheel Rubbing Inlet
Adjust wheel and/or inlet cone. Tighten wheel hub or bearing
collars on shaft.
Tighten sheaves on motor/fan shaft. Adjust belt tension. Align
sheaves properly (see page 4). Replace worn belts or sheaves.
Replace defective bearing(s). Lubricate bearings. Tighten
collars & fasteners.
Clean all dirt off wheel. Check wheel balance, rebalance in
place if necessary.
Fan Check wheel for correct rotation. Increase fan speed.*
Duct System See page 4.
Fan Resize ductwork. Access door, ﬁlters, grills not installed.
Change obstructions in system. Use correction factor to adjust
for temperature/altitude. Resize ductwork. Clean ﬁlters/coils.
Change fan speed.*
Duct system has more
or less restriction than
Check rotation of wheel. Adjust fan speed.
Fan Check rotation of wheel. Reduce fan speed.
Resize ductwork. Check proper operation of face and bypass
dampers. Check ﬁlters and access doors.
Fan Doesn’t Operate
Check fuses/circuit breakers. Check for switches off. Check for
correct supply voltage.
Drive Check for broken belts. Tighten loose pulleys.
Assure motor is correct horsepower and not tripping overload
Lubrication Check for excessive or insufﬁcient grease in the bearing.
Replace damaged bearing. Relieve excessive belt tension.
Align bearings. Check for bent shaft.
NOTE: Always provide the unit model and serial numbers when requesting parts or service information.
* Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor
and result in burnout.
455308 • SWB / SFB / SFD, Rev. 6, June 2011 Copyright 2011 © Greenheck Fan Corporation
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the
shipment date. Any units or parts which prove to be defective during the warranty period will be replaced at our option
when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer for a period of one
year. Should motors furnished by Greenheck prove defective during this period, they should be returned to the nearest
authorized motor service station. Greenheck will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change speciﬁcations without notice.
Greenheck Centrifugal Utility Fan catalog provides additional
information describing the equipment, fan performance,
available accessories, and speciﬁcation data.
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides
additional safety information. This publication can be
obtained from AMCA International, Inc. at www.amca.org.