COOK CPL - Manual (Page 6)

6
sive force is used in placing the pulleys on their
respective shafts.
g. Tighten in place.
h. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The fan bearings are pillow block ball bearings. Bearings
should be replaced individually for each side of fan.
An emery cloth or file may be needed to remove imper-
fections in the shaft left by the setscrews.
a. Remove belts.
b. If replacing drive side bearing, mark location of pulley
and remove.
c. Mark bearing location on bearing support and loosen
bearing hold down bolts.
d. Support the shaft to remove weight from bearing.
e. Remove anti-corrosion coating from the shaft with a
suitable degreaser.
f. Remove the bearing from the shaft using a bearing
puller. If a bearing puller is not available, tap on the
bearing with a wood block and hammer to remove it.
g. Smooth and clean the shaft and bearing bore thor-
oughly.
h. Place the bearings into position making sure they are
not on a worn section of the shaft. Tapping the inner
ring face with a soft driver may be required.
Do not hammer on the housing.
i. The outer ring of the bearing is spherical and swivels in
the housing to compensate for misalignment. Secure
hold-down bolts, but do not fully tighten.
j. Align the setscrews on the bearings and tighten one
setscrew on each bearing.
k. Rotate the shaft to allow the bearing outer rings to find
their center of free movement.
l. Tighten hold-down bolts to proper torque as shown in
the torque chart.
m. Turn the shaft by hand. Resistance should be the
same as it was before hold-down bolts were fully tight-
ened.
n. Tighten bearing setscrews to specified torque (see
chart).
o. Re-install the pulley and adjust the belt tension. Refer
to Belts and Pulley Installation.
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
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
compatable 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
(184T max.) 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 maintained.
Pulley and Belt Replacement
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when exces-
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
Max Class Speeds of PLC
Size
CPL-A CPL-F
Class I Class II Class III Class I Class II Class III
120 3948 5151 6490 3692 4817 6069
135 3508 4577 5766 2953 3853 4854
150 2749 3587 4519 2656 3465 4366
165 2509 3273 4124 2414 3150 3968
180 2150 2805 3534 2389 3117 3927
195 1987 2592 3266 2204 2876 3623
210 1841 2402 3026 1786 2330 2936
225 1712 2234 2814 1659 2164 2727
245 1608 2098 2643 1532 1999 2518
270 1418 1850 2331 1391 1815 2286
300 1276 1665 2097 1251 1632 2056
330 1162 1516 1910 1141 1489 1876
365 1065 1389 1751 1022 1333 1680
402 964 1258 1585 936 1221 1539
445 873 1139 1435 846 1104 1391
490 793 1035 1303 770 1005 1266
540 719 938 1182 699 912 1149
600 648 845 1065 629 821 1034
660 587 766 965 572 746 940
730 532 694 874 517 675 850