Greenheck SQ 60-75 Installation, Operation And Maintenance Manual page 8

Maintenance: SQ / BSQ
Installation and maintenance are to be performed
only by qualified personnel who are familiar with local
codes and regulations and who are experienced with
this type of equipment.
Motor maintenance is generally limited to cleaning
and lubrication (where applicable). Cleaning should
be limited to exterior surfaces only. Removing dust
buildup on motor housing ensures proper motor
cooling.
Greasing of motors is only intended when fittings are
provided. Many fractional horsepower motors are
permanently lubricated and should not be lubricated
after installation. Motors supplied with grease fittings
should be greased in accordance with manufacturers'
recommendations. Where motor temperatures do not
exceed 104ºF (40ºC), the grease should be replaced
after 2,000 hours of running time as a general rule.
Wheels require very little attention when moving
clean air. Occasionally, oil and dust may accumulate
causing imbalance. When this occurs the wheel and
housing should be cleaned to ensure smooth and safe
operation.
All fasteners should be checked for tightness each
time maintenance checks are performed prior to
restarting unit.
A proper maintenance program will help these units
deliver years of dependable service.
WARNING
Always disconnect, lock and tag power source
before servicing. Failure to disconnect power
source can result in fire, shock or serious injury.
CAUTION
Uneven cleaning of the wheel will produce an out of
balance condition that will cause vibration in the fan.
WARNING
This unit should be made non-functional when
cleaning the wheel or housing (fuses removed,
disconnect locked off).
Belt/Bearing Maintenance BSQ Unit
1. Belts tend to stretch after a period of time. They
should be checked periodically for wear and
tightness. When replacing belts, use the same
type as supplied with the unit.
2. Matched belts should always be used on units
with multi-groove pulleys.
3. For belt replacement, loosen the tensioning device
enough to allow removal of the belt by hand. Do
not force belts on or off. This may cause cords to
break, leading to premature belt failure.
4. Once installed, adjust belts as shown in
"Pre-Start-Up Checks."
8
Centrifugal Inline Exhaust Fans
5. Shaft bearings can be classified in two groups:
relubricating and non-relubricating. All bearings on
standard model BSQ fans are factory lubricated
and require no further lubrication under normal
use (between -20ºF and 180ºF in a relatively clean
environment).
6. Units installed in hot, humid or dirty locations
should be equipped with special bearings. These
bearings will require frequent lubrication. Caution
should be employed to prevent overpacking or
contamination.
7. Grease fittings should be wiped clean. The unit
should be in operation while lubricating. Extreme
care should be used around moving parts.
8. Grease should be pumped in very slowly until a
slight bead forms around the seal. A high grade
lithium base grease should be used.
Recommended Relubrication
Frequency in Months
NOTE: If unusual environment conditions exist
(extreme temperature, moisture or contaminants) more
frequent lubrication is required.
A good quality lithium base grease, conforming to
NLGI Grade 2 consistency, such as those listed here
may be used.
Suggested Fan Bearing Greasing Intervals
Interval
(months)
Heavy duty in dirty, dusty locations; high ambient
1 to 3 temperatures; moisture laden atmosphere;
vibration.
12 to 24 hours per day, heavy duty, or if moisture
3 to 6
is present
8 to 16 hours per day in clean, relatively dry
6 to 12
atmosphere
Infrequent operation or light duty in clean
12 to 18
atmosphere
Grease Manufacturers
Manufacturer
U.S. Electric Motors
Chevron U.S.A. Inc
Mobil Oil Corporation
Texaco, Inc.
Amoco Oil Co.
Exxon
Shell
Type of Service
Grease (NLGI #2)
Grease No. 83343
Chevron SRI Grease #2
Mobilith
Mobil 532
Premium BRB #2
Texaco Multifak #2
Rykon Premium #2
Unirex N2
B Shell Alvania #2
®