Shaft speed, Belt, Replacement – COOK CPL User Manual
Page 6: Bearing replacement, Lubrication - motor bearings, Motor services, Changing shaft speed, Pulley and belt replacement

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