Specifications

– 40 –
Fractional HP Century, G.E., Bronze sleeve
single phase, or equal bearings
ODP or
TEFC
Recommendation: See following note.
Fan shaft Browning Self-aligning
bearings or equal single row or
double row
roller or ball
bearings,
resilient
mounted
Recommendation: See following note.
Dampers Mestex Sleeve
or equal
Recommendation: See following note.
1. Blower Motors – Some motors require lubrication
while others do not. Those that require lubrication
can be identified by the presence of grease plugs in
the motor casing at each end. Motors that do not
have grease plugs cannot be greased and are
lubricated for the life of the motor bearing.
Lubrication of motors should be done while the
motor is warm and at a standstill. Remove and
clean all grease plugs and insert a grease fitting in
the upper hole in the motor casing at each end.
(Viewed as if motor were sitting horizontally on its
base). There may be one or two plugs in each end
casing of the motor. Add a small amount of a clean,
good grade ball bearing grease, such as Chevron
SR1 #2 or Exxon Polyrex EM with a low pressure
grease gun. Run the motor five minutes before
removing the grease fittings and replacing the
plugs.
CAUTION: An excess of grease will overheat
the bearings.
NOTE: On totally enclosed fan cooled (TEFC)
motors, the rear end fan housing must be
removed to expose the grease plugs.
2. Pillow Block Bearings – Pillow block bearings are
used on supply blowers or propellers. These bear-
ings have been prelubricated with a number 2
lithium base grease. Lubrication should be done
with a similar grease using a low pressure grease
gun. Wipe all grease fittings clean before adding
grease. Grease should be added slowly, in small
amounts at frequent intervals while the shaft is
being manually rotated.
A slight showing of grease at the seals with accom-
panying normal bearing temperature indicates
proper lubrication. Normal temperature can range
from “cool” to “hot to the touch” depending on size,
speed and surrounding conditions. Excessive
bearing temperature indicates faulty lubrication. An
insufficient amount of grease is suggested by a
bearing showing no grease at the seals, and a
higher than normal temperature and noise level.
Excessive leakage of grease at the seals, and a
high operating temperature suggest too much
grease.
Frequency of Lubrication – Frequency of lubrica-
tion depends upon operating conditions. The bear-
ing operating temperature is the best index for
determining a lubrication schedule. The following
chart gives the frequency of lubrication based upon
continuous operation for various operating tem-
peratures and can be used as a satisfactory guide
for determining when all ball and roller bearings
should be lubricated.
Speed Temperature Cleanliness Interval
100 RPM Up to 125
o
F Clean 6 Months
500 RPM Up to 150
o
F Clean 2 Months
1000 RPM Up to 210
o
F Clean 2 Weeks
1500 RPM Over 150
o
F Clean Weekly
Any Speed Up to 150
o
F Dirty 1 Week
To 1 Month
Any Speed Over 150
o
F Dirty Daily to
1 week
Any Speed Any Temp Very Dirty Daily to
1 week
Any Speed Any Temp Extreme Daily to
Conditions 1 week
3. Dampers – Dampers should be inspected as nec-
essary for securely fastened linkages, and smooth
operation. If dampers are binding or excessively
noisy, then lubrication may be required. Place one
drop of #20 wt. machine oil on each blade bearing,
and linkage ball joint. Do not over lubricate, and
wipe any excess from the area. Be sure to note that
dampers over 49 inches long have intermediate
bearings which require lubrication.
C. Air Filters
All filter banks should be equipped with a manometer or
differential pressure switch to indicate when the filters
are dirty. Filters should be replaced when the differential
pressure across them reaches the manufacturer’s rec-
ommended final value. Dirty filter elements should be
replaced with a clean element of the same type and
size. In addition, the manufacturer not only suggests,
but insists, that air filters be checked every 30 days
and replaced with new filters (throwaway type) or
cleaned (washable type) as required. Cleanable filters
should be given a new application of filter coating after
washing to maintain optimum filter performance.