Belt-Drive Fan Maintenance; Bearing Lubrication Schedule - Greenheck SWB 100 Series Installation, Operation And Maintenance Manual

Check wheel rotation by momentarily
energizing the unit and noting if rotation is in
the same direction as the airflow at the outlet
and conforms to the rotation decal affixed to
the unit (Fig. 5). NOTE: Models SFD and SFB
units should be operated only when attached
to the system for which they were designed.
Without proper system static pressure the
motor could be seriously overloaded.
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DISCONNECT AND SECURE TO THE "OFF" POSITION ALL ELECTRICAL POWER TO THE FAN PRIOR
TO INSPECTION OR SERVICING. FAILURE TO COMPLY WITH THIS SAFETY PRECAUTION COULD
RESULT IN SERIOUS INJURY OR DEATH.
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BLOWER MAINTENANCE (BELT DRIVE)
Belts tend to stretch after a period of time. They
should be periodically checked for tension and
wear. When replacing belts, use the same type as
supplied with the unit. Replacement of belts should
be accomplished by loosening the tensioning "L-
bolts" so the belts may be removed by hand. Do not
force belts on or off as this may cause breakage of
cords and lead to premature belt failure.
Belt tension should be adjusted to allow 1/64" of
belt deflection per 1" of belt span. For example, a
16" belt span should have 16/64" or 1/4" of
deflection with moderate thumb pressure at mid-
point between the pulleys. (Fig. 6).
Belt Span
Deflection = Belt Span
64
Fig. 6
Airflow
Fig. 5
WARNING
Shaft bearings are the most critical moving part of a
fan. Therefore, special attention should be given to
keeping the bearings clean and well lubricated.
Proper lubrication provides for reduction in friction
and wear, transmission and dissipation of heat,
extended bearing life and prevention of rust.
In order for a lubricant to fulfill these tasks, the
proper grease applied at regular intervals is
required. See the recommended bearing lubrication
schedule.

BEARING LUBRICATION SCHEDULE

FOR GREENHECK UTILITY FANS
(Relubrication schedule in months)
FAN RPM
To 500
500-1000
1000-1500
1500-2000
2000-2500
2500-3000
3000-3500
5
Backward Inclined
Airflow
Forward Curved
WHEELS VIEWED FROM
THE DRIVE SIDE
Shaft Diameter in inches
3/4 to 1 1/2 1 3/4 to 2
6
6
5
4
4
3
2
6
5
4
3
2
1
1