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Speed Reduction

Open the pulley in order that

the belt rides deeper in the

groove (smaller pitch diame-

ter).

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 main-

tained.

Pulley and Belt Replace-

ment

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 and

shafts.

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 excessive

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.

Figures 6, 7, and 8, on page 6, show the components

described in the following steps.

CIC Bearing Replacement

a. Loosen and remove belts by lowering motor mounting

plate with the four adjusting nuts.

b. Remove the discharge cover by removing the attaching

bolts around the perimeter of the inner drum (discharge

end of unit). Do not remove fan sheave yet.

c. Remove the discharge cover by removing the attaching

bolts around the perimeter of the inlet plate.

d. Remove inlet cone by removing attaching bolts/nuts

around perimeter of the inlet plate.

e. Remove wheel by loosening setscrews and sliding off

shaft. A 2-jaw puller may be required.

f. Record the location of the fan sheave from end of shaft,

and remove the sheave.

g. Record the distance from either bearing to the end of

the shaft.

h. Loosen setscrews on bearings and remove shaft.

i. Mark setscrew location on shaft and smooth down any

raised shaft material as required.

j. Remove bearings from bearing base and replace with

new ones, noting the exact location of each; Do not fully

tighten base bolts.

k. Slide shaft through bearings until shaft protrudes the

same amount as measured above. Tapping the inner

race of each bearing with a soft driver may be required.

NOTICE! Do not hammer the end of the shaft or the

bearing housing.

Maximum RPM

CIC

Size

Class 1 Class 2 Class 3

120 3948 5151

135 3508 4577

150 2749 3587

165 2509 3273

180 2150 2805 3534

195 1987 2592 3266

210 1841 2402 3026

225 1712 2234 2814

245 1608 2098 2643

270 1418 1850 2331

300 1276 1665 2097

330 1162 1516 1910

365 1065 1389 1751

402 964 1258 1585

445 873 1139 1435

490 793 1035 1303

540 719 938 1182

600 648 845 1065

660 587 766 965

730 532 694 874

Figure 6- CIC Arrangement 1 Components

Figure 7 - CIC Arrangement 9 Components

Figure 8 - UCIC Components

l. Return setscrews to same location as marked above

and tighten one setscrew on each bearing to half its

specified torque.

m. Rotate the shaft to allow the bearings to align them-

selves.

n. Install wheel and inlet cone to their proper location per

wheel-to-inlet clearance section on page 3.

o. Tighten hold-down bolts to proper torque.

p. Turn the shaft by hand. resistance should be the same

as it was before hold-down bolts were fully tightened.

q. Tighten all bearing setscrews to full specified torque.

r. Replace the sheave, align with motor sheave, and

adjust the belt tension.

s. Test run fan and retighten all setscrews and bolts, and

trim balance as necessary (.0785 in/sec max).

t. Replace discharge cover.

After 24 hours of operation, retighten all setscrews and bolts

to the appropriate torque.

1 2 3 4 5 6 7 8 9 10 11 12

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