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Maintenance
Once the fan has been put into operation, a periodic
maintenance program should be set up to preserve
the reliability and performance of the fan. Items to be
included in this program are:
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Belts
Premature belt failures are frequently caused by
improper belt tension (either too tight or too loose) or
misaligned pulleys. The proper tension for operating a
V-belt is the lowest tension at which the belts will not
slip at peak load conditions. For initial tensioning, the
proper belt deflection
half-way between pulley
centers is 1/64 inch for
each inch of belt span.
For example, if the belt
span is 64 inches, the
belt deflection should be
one inch using moderate
thumb pressure at
midpoint of the drive.
Check belt tension two times during the first 24 hours
of operation and periodically thereafter. To adjust belt
tension, simply loosen four fasteners (two on each side
of the motor plate) and slide the motor plate away from
the fan shaft until proper belt tension is attained. On
some fans, fasteners attaching the motor to the motor
plate must be loosened in order to adjust
the belt.
It is very important that the drive
pulleys remain in proper alignment
after adjustments are made.
Misalignment of pulleys will result
in premature belt wear, noise,
vibration and power loss.
Fasteners and Set Screws
A periodic inspection should include checking all
fasteners and set screws for tightness. Particular
attention should be paid to set screws attaching the
wheel to the shaft.
WARNING
Disconnect all electrical power to the fan and secure
to the ‘OFF’ position prior to inspection or servicing.
Failure to comply with this safety precaution could
result in serious injury or death.
Motors
Many fractional horsepower motors installed on the
smaller fans are lubricated for life and require no further
attention. Motors supplied with grease fittings should be
greased according to directions printed on the motor.
Removal of Dust and Dirt
Dirt clogs cooling openings on the motor housing,
contaminates bearing lubricant, and collects on the
impeller causing severe imbalance if left unchecked.
The exterior surface of the motor and impeller should be
thoroughly cleaned periodically. Use caution and do not
allow water or solvents to enter the motor or bearings.
Under no circumstances should motors or bearings be
sprayed with steam or water.
Fan Shaft Bearings
The bearings for Greenheck fans are carefully selected
to match the maximum load and operating conditions
of the specific class, arrangement, and fan size. The
instructions provided in this manual and those provided
by the bearing manufacturer will minimize any bearing
problems. Bearings are the most critical moving part
of the fan; therefore, special care is required when
mounting them on the unit and maintaining them.
Locking collars and set screws, in addition to fasteners
attaching the bearing to the bearing plate must be
checked for tightness. Greenheck Fan Corporation
recommends bearings to be relubricated quarterly at a
minimum. All Vektor-H and Vektor-HS fans use Mobil
Mobilith SHC 100 synthetic grease conforming to
NCGI Grade 2. Never mix greases made with different
bases as this will cause a breakdown of the grease and
possible failure of the bearing. For specific information,
contact the factory representative or the fan system
submittals.
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dirt or excessive vibration, consult the factory for a
specific lubrication interval for your application.
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synthetic grease conforming to NLGI Grade 2.
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lubrication intervals by approximately 3 times.
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monthly rotation of the shaft and purging grease
prior to storage and start-up.
Belt
Alignment
Deflection =
Belt Span
64
Belt Span
Belt Tension
9
Laboratory Exhaust System
®