COOK TCN - Manual (Page 6)

6
• Bearings should be inspected as recommended in the
Conditions Chart.
• Inspect variable inlet vanes for freedom of operation
and excessive wear. The vane position should agree
with the position of the control arm. As the variable inlet
vanes close, the entering air should spin in the same
direction as the wheel.
• Inspect springs and rubber isolators for deterioration
and replace as needed.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the wheel
and housing prevent imbalance and damage.
Lubrication - Fan Bearings
TCN bearings are lubricated through a grease fitting on
the bearing and should be lubricated by the schedule,
Lubrication Conditions Chart.
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can burst
seals thus reducing bearing life.
In the event the bearing cannot be seen, use no more
than three injections with a hand-operated grease gun.
Before lubricating, the grease nipple and immediate
vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease should be supplied
slowly as the bearing rotates until fresh grease slips past
the seal. Excessive pressure should be avoided to prevent
seal damage.
Exceptions to the greasing interval chart:
• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be per-
formed prior to each break in operation.
• Higher Temperature: it is recommended to halve the
intervals for every 30
F increase in operating tempera-
ture above 120
F not to exceed 230F for standard
bearings; High Temperature bearings (optional) can
operate up to 400
F.
• Vertical Shaft: it is recommended that the intervals
should be halved.
NOTICE! Loren Cook Company uses petroleum lubri-
cant in a lithium base. Other types of grease should
not be used unless the bearings and lines have been
flushed clean. If another type of grease is used, it
should be a lithium-based grease conforming to NLGI
grade 2 consistency. A NLGI grade 2 grease is a light
viscosity, low-torque, rust-inhibiting lubricant that is
water resistant. Its temperature range is from -30
F to
+200
F and capable of intermittent highs of +250F.
Lubrication Conditions Chart
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Motor bearings without provisions for relubrication will
Fan Class Fan Status Shaft Size
Maximum Interval
(operational hrs)
TCN
Inline
Blowers
Normal Conditions
(Clean, Dry & Smooth)
> 1-1/2” 10,000
< 1-1/2” 2,000
Extreme Conditions
(Dirty/Wet/Rough)
> 1-1/2” 2,000
< 1-1/2” 400
operate up to 10 years under normal conditions with no
maintenance. In severe applications, high temperatures or
excessive contaminates, it is advisable to have the mainte-
nance department disassemble and lubricate the bearings
after 3 years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the following table.
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatible grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook representative or
your nearest authorized electric motor service representa-
tive.
Changing Shaft Speed
All belt driven fans with motors up to and including 5 HP
are equipped with variable pitch pulleys. To change the fan
speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
b. Turn the pulley rim to open or close the groove facing.
If the pulley has multiple grooves, all must be adjusted
to the same width.
c. After adjustment, inspect for proper belt tension.
Speed Reduction
Open the pulley in order that the belt rides deeper in
the groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that
the belt rides higher in the
groove (larger pitch diameter).
Ensure that the RPM limits of
the fan and the horsepower
limits of the motor are main-
tained.
Pulley and Belt Replace-
ment
a. Loosen and remove belts by
lowering motor mounting
plate with the four adjusting
nuts.
b. Remove pulleys from their
respective shafts.
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
including 184T
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
Fan
Size
Max Catalog RPM
TCN TCNH
60 3899 4231
70 3942 4231
80 3600 4231
100 3382 4231
120 2894 3692
135 2305 2953
150 2162 2656
165 2092 2414
180 1817 2389
195 1578 2204
210 1404 1786
225 1534 1659
245 1485 1532
270 1250 1391
300 1038 1251
330 978 1141
365 817 1022
402 694 894
445 672 846
490 573 770