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Shaft speed, Belt, Replacement – COOK CPL User Manual

Page 6: Bearing replacement, Lubrication - motor bearings, Motor services, Changing shaft speed, Pulley and belt replacement

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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