Bearing Lubrication
The most common cause of premature bearing failure
is improper lubrication.Greasable fan bearings are
lubricated through a grease fitting on the bearing and
should be lubricated by the guidelines recommended
by the following relubrication schedule.
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"61/3-2urht"61/51-1
"61/51-2urht"61/11-2
"61/51-3urht"61/7-3
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Puddle corrosion is often encountered in failed
bearing, particularly if the fan has been shut down for
a period of time. Moisture caused by condensation
will accumulate in the bearings and create corrosion
in the race ways. If fans are to be shut down or stored
for more than 30 days it is important that the bearings
are filled with grease and the fan rotated by hand
from time to time so that the grease can be spread on
bearing components. All bearings are filled with
grease before leaving the factory. When the fans are
started, the bearings may discharge excess grease
through the seals after a short period of operation, but
do not replace this initial discharge because leakage
will cease when the excess grease has worked out.
Sometimes the bearing has a tendency to run hotter
during this period and one should not get alarmed
unless it lasts over 48 hours or gets very hot. When
relubricating use sufficient amount of grease to purge
the seals. For best results, lubricate the bearing while
the fan is in operation. Pump grease slowly until a
slight bead forms around the bearing seals.Excessive
grease can burst seals thus reducing the bearing life.
When a bearing failure occurs, it is important that the
failed bearings be preserved as well as possible and
returned to the factory for examination so that the
cause of failure can be established and corrective
measures taken. The only way to know the cause of
failure is to supply as much information as possible
about the operating condition. Before installing a new
bearing on the existing shaft, a check must be made
to ensure that the shaft has not worn down below
commerical tolerances, which would cause a rapid
failure of the new bearings.
1. Loosen setscrew on driver pulley and remove key,
if applicable.
2. Turn the pulley rim to open or close the groove
facing. If the pulley has multiple grooves, all need
to be adjusted to the same width.
3. After adjustment, inspect for proper belt tension.
Speed Reduction
Open the pulley in order that the belt rides deeper in
the groove. This results in a smaller pitch diameter.
Speed Increase
Close the pulley in order that the belt rides higher in
the groove. This result in a larger pitch diameter.
Verify that the new RPM of the fan is within the
horsepower limits of the motor.
Pulley and Belt Replacement
1. Remove pulleys.
2. Clean the motor and fan shafts,and bores of
pulleys. Coat the bores with a heavy grade oil.
3. Remove any burrs from shafting by sanding.
4. Install both pulleys on their respective shaft. The
pulleys can be damage if excessive force is used
on placing the sheaves on their shafts.
5. Tighten the pulleys in place.
6. install the belts. Refer to the Belt and Pulley
Installation section in the manuel.
Motor Services
Should the motor prove defective within the one year
warranty period, contact Romlair or your nearest
authorized electric motor service center. The motor
will be repaired for replaced at the manufactuerers
option.
Changing Shaft Speed
All belt driven fans up to and including 7-1/2 Hp are
equipped with variable pitch drives. To change the fan
speed, perform the following.
CAUTION:
When operating conditions of the fan are to
be changed (speed, pressure, temperature,
etc.) consult Romlair to determine if the unit
can operate safely at the new conditions.
