7CA/CF/CP IO&M B51181-002
Motor Bearings
Motors are provided with prelubricated bearings. Any lubrica-
tion instructions shown on the motor nameplate supersede in-
structions below. Motor bearings without provisions for relubri-
cation 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 maintenance
department disassemble and lubricate the bearings after three
years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow intervals of
the table below.
Relubrication Intervals
Service
Conditions
Nema Frame Size
Up to and
Including 184T
213T-365T 404T and Larger
1800
RPM &
Less
Over
1800
RPM
1800
RPM &
Less
Over
1800
RPM
1800
RPM &
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 month
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 pe-
riod, contact your local Loren Cook representative or your
nearest authorized electric motor service representative.
Changing Shaft Speed
All belt driven fans with motors up to and including 5HP
(184T max) are equipped with variable pitch pulleys. To
change the fan speed, perform the following:
1. Loosen setscrew on driver (motor) pulley and remove key,
if equipped.
2. 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.
3. 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 lim-
its of the fan and the horsepower limits of the motor are
maintained.
Maximum RPM
CA SWSI, CPS-A, CPA-A
Size
Max. RPM
Class I Class II Class III
120 3348 4368 5503
135 2976 3883 4892
150 2678 3494 4403
165 2435 3177 4002
180 2114 2757 3474
195 1951 2545 3207
210 1812 2363 2978
225 1691 2206 2779
245 1553 2026 2553
270 1419 1851 2332
300 1277 1666 2099
330 1161 1514 1908
365 1064 1388 1749
402 965 1259 1586
445 873 1138 1434
490 793 1034 1303
540 719 938 1182
600 647 844 1094
660 588 768 967
730 532 694 874
CA and CAF DWDI
Size
Max. RPM
Class I Class II Class III
120 3714 4846 6105
135 3307 4315 5436
150 2575 3357 4230
165 2374 3095 3901
180 2176 2839 3577
195 2009 2621 3302
210 1865 2434 3066
225 1741 2271 2862
245 1631 2128 2681
270 1443 1883 2372
300 1262 1647 2074
330 1147 1496 1885
365 1038 1354 1706
402 941 1228 1547
445 851 1110 1399
490 773 1009 1271
540 702 916 116 4
600 631 823 1037
660 574 749 944
730 519 677 853
CF SWSI, CPS, CPA
Size
Max. RPM
Class I Class II Class III
60-100* 4230 5519 6953
120 3404 4441 5595
135 3026 3948 4974
150 2723 3553 4476
165 2476 3230 4069
180 2269 2961 3730
195 2095 2733 3443
210 1795 2341 2950
225 1675 2185 2753
245 1539 2007 2529
300 1257 1639 2065
330 1142 1490 1877
365 1023 1334 1681
402 939 1225 1543
445 849 110 8 1396
490 771 1006 1268
540 700 913 115 0
600 630 822 1035
660 573 747 9 41
730 518 675 851
*Sizes 60 through 100 only applies to
CPS and CPA.
CPV
Size
Max. RPM
Standard Reinforced
60-100* 2719
-
120 2527
135 2093
150 2035
165 1766
180 1588
195 1429 1571
210 1277 1407
225 1152 1265
245 1015 1260
270 876 1091
300 837 1006
330 716 869
365 624 805
402 539 701
445 463 660
490 360 576
RPM Derating Factor
Temperature
(°F)
RPM Factor
Steel Aluminum
70 1.00 1.00
200 0.98 0.93
300 0.96 0.79
400 0.94
**
500 0.91
600 0.87
700 0.81
800 0.75
For elevated airstream temperatures, the maximum fan speed limits
must be derated by the factors above.
Pulley and Belt Replacement
1. Remove pulleys from their respective shafts.
2. Clean the motor and fan shafts.
3. Clean bores of pulleys and coat the bores with heavy oil.
4. Remove grease, rust or burrs from the pulleys and
shafts.
5. Remove burrs from shaft by sanding.
6. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when exces-
sive force is used in placing the pulleys on their re-
spective shafts.
7. Tighten in place.
8. Install belts on pulleys and align as described in Belt
and Pulley Installation.
Bearing Replacement
The fan bearings are pillow block ball bearings.
An emery cloth or le may be needed to remove imper-
fections in the shaft left by the setscrews.
For Arrangement 1, 2, 9 and 10:
1. Mark the position on the shaft of both bearing races, set-
screws, and the wheel and pulley. Mark the location and
orientation of the inlet cone. Note the clearance between
the wheel and inlet cone.
2. Remove the fan pulley and inlet cone.
3. Remove the wheel from the shaft. A 2-jaw puller may be
needed.
4. Remove bearing hold-down bolts. Remove shaft and
bearings as one unit.
5. Remove the anti-corrosion coating from the shaft with a
suitable degreaser.
6. Remove the bearing from the shaft using a bearing pull-
er. If a bearing puller is not available, tap on the bearing
with a wood block and hammer to remove it.
7. Smooth and clean the shaft and bearing bore thoroughly.
**Aluminum wheels are
not available above 300°.
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