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Symptom Cause
Solution
Wrong direction of wheel rotation, rotate wheel orientation
Shaft bent, repair or replace
Poor alignment, realign motor and housing
Bind on wheel in housing, repair and realign motor and
housing
Bearing wear; lubricate, repair, or replace bearings
Temperature too high, replace motor for one better suited
Build-up of dirt or dust, clean fan
Short in wiring, repair or rewire fan
Defective motor, replace
Consult fan manufacturer
Motor overloads (continued)
Consult Customer Service (1-800-479-6801)
See sections following
High Pressure Drop
End of cartridge service life, replace cartridges
Check and clean pulsing mechanisms
Increase compressed air pressure or volume
Eliminate moisture in collector
Check and repair the timer / controller
Inspect and clean inlet baffles
Perform off-line cleaning of filter cartridges
Install overbags
Add more compartments or modules
Increase filter media area or change filter media type
Poor Airflow (continued)
Plugged cartridges
Consult Customer Service (1-800-479-6801)
Tighten wheel of fan
Replace wheel of fan
Balance or adjust fan wheel
Consult manufacturer of fan
Fan impeller hitting the inlet of the fan
Consult Customer Service (1-800-479-6801)
Lubricate bearings
Replace bearings
Consult manufacturer of fan
Bad bearings in the fan
Consult Customer Service (1-800-479-6801)
Damaged wheel, replace or repair wheel
Damaged housing, replace or repair housing
Broken or loose belt, repair or replace belt
Worn coupling, replace coupling
Broken or loose bolt or screws, replace or tighten bolts and
screws
Unstable foundation or supports, tighten or shim housing
Housing of fan vibrating
Consult Customer Service (1-800-479-6801)
Defective starting relay, replace relay
Replace motor starter
Consult manufacturer of motor starter
Electric “Humming” sound
Consult Customer Service (1-800-479-6801)
Compressed air being lost, check compressed air line
connection
Diaphragm stuck open, check and repair diaphragm
Check hose connection on purge pipes and air headers
(repair)
Check drain valve on air header, close if necessary
Abnormal Noise
Constant “Hissing” sound
Consult Customer Service (1-800-479-6801)