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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

1 2 3 4 5 6 7 8

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