Tube Axial Upblast Fans
8
®
Routine Maintenance and Operation
WARNING
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.
DANGER
Pour écarter les risques de blessure grave ou
de mort, débrancher et verrouiller l’alimentation
électrique en position « Arrêt » avant tout contrôle
ou entretien.
Once the fan has been put into operation, periodic
maintenance should be scheduled to assure reliability
and performance. The following items should be
checked as a part of this maintenance schedule:
Motors
Motor maintenance is generally limited to cleaning
and lubrication. Cleaning should be limited to exterior
surfaces only. Removing dust and grease buildup
on the motor housing assists proper motor cooling.
Never wash down motor with high pressure spray.
Greasing of motors is only intended when fittings are
provided. Many fractional motors are permanently
lubricated for life and require no further lubrication.
Motors supplied with grease fittings should be
greased in accordance with the manufacturer’s
recommendations. When motor temperature does not
exceed 104ºF (40ºC), the grease should be replaced
after 2000 hours of running time.
Direct drive systems have extended grease lines to
lubricate the motor without removal of any guarding.
Fasteners and Set Screws
Normal fan vibration has a tendency to loosen
mechanical fasteners. Periodic inspection should
include checking all fasteners and set screws,
including the propeller fasteners, for tightness.
Direct Drive Fans
LUBRICATION
-
Lubrication of motors is intended
only when fittings are provided. Many fractional
horsepower motors are permanently lubricated and
require no further lubrication. Motors supplied with
grease fittings should be greased in accordance with
the manufacturers directions on the motor nameplate.
Belt Drive Fans
BEARINGS
-
Bearings are one of the most critical parts
of a fan and should be inspected at regular intervals.
Locking collars, set screws and fasteners attaching
the bearings to the fan should also be checked.
LUBRICATION
-
Bearings operating in a clean
environment and temperatures between 32°F and
200°F should be lubricated semiannually using a
high quality lithium based grease. Those operating
outside these temperatures require special high or low
temperature grease. If contamination or high moisture
conditions exist, more frequent lubrication is required.
Models TAUB-CA and TAUB are equipped with
extended lubrication lines as standard. The grease
fittings are located on the exterior of the fan housing
next to the motor cover and should be wiped clean
before adding grease.
When adding grease to the fan bearings, rotate the
fan shaft while slowly operating the manual grease
gun.
Be careful not to unseat the bearing seals by
over lubricating or using excessive pressure.
Stop
pumping when a very slight resistance is felt at the
grease gun.
Lubrication of motors is intended only when fittings
are provided. Many fractional horsepower motors
are permanently lubricated for life and require no
further lubrication. Motors supplied with grease
fittings should be greased in accordance with the
manufacturer’s directions on the motor nameplate.
BELTS
-
V-belt drives must be checked on a
regular basis for wear, tension, alignment and dirt
accumulation. Premature or frequent belt failures can
be caused by improper belt tension (either too loose
or too tight), misaligned pulleys or by prying belts on
and off pulleys. Abnormally high belt tension or drive
misalignment will cause excessive bearing loads and
may result in failure of the fan and/or motor bearings.
Conversely, loose belts will cause squealing on start-
up, excessive belt flutter, slippage and overheated
sheaves. Either excessively loose or tight belts may
cause fan vibration.
When replacing V-belts on multiple groove drives,
all belts should be changed to provide uniform drive
loading. Do not pry belts on or off the sheave. Loosen
belt tension until belts can be removed by simply
lifting the belts off the sheaves. After replacing belts,
ensure that slack in each belt is on the same side of
the drive. Belt dressing should never be used.
Fan Operation
All fans should be run every thirty (30) days, or at least
“bumped” every thirty days. It is preferred that each
fan is run as this causes all electrical and mechanical
components to get up to temperature, displacing any
formed condensation, redistributes load on bearings,
and redistributes grease in the motor and shaft
bearings.
IMPORTANT
When operating conditions of the fan are to be
changed (speed, pressure, temperature, etc.),
consult manufacturer to determine if the unit can
operate safely at the new condition.
