Cook CP User Manual download pdf (Page 8)

After 24 hours of operation, retighten the setscrews to

the appropriate torque. This assures full locking of the inner

race to the shaft. Make sure the socket key or driver is in

good condition with no rounded corners. The key should be

fully engaged in the setscrew and held squarely to prevent

rounding out of the setscrew socket when applying

maximum torque.

For Arrangement 3: Bearings should be replaced

individually for each side of fan.

1. Loosen and remove belts.

2. If replacing drive side bearing, mark location of pulley

and then remove.

3. Mark bearing location on bearing support and loosen

bearing hold down bolts.

4. Support shaft to remove weight from bearing.

5. Remove anti-corrosion coating from the shaft with a

suitable de-greaser.

6. Remove 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.

7. Smooth and clean the shaft and bearing bore

thoroughly.

8. Place the bearing into position making sure it is 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.

9. 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.

10. Align setscrews on the bearings and tighten one

setscrew on bearing.

11. Rotate the shaft to allow the bearing outer ring to find

its center of free movement.

12. Tighten hold-down bolts to proper torque. Refer to

Torque chart.

13. Turn the shaft by hand. Resistance should be the

same as it was before hold-down bolts were fully

tightened.

14. Tighten bearing setscrews to specified torque.

15. Re-install the pulley if required.

16. Repeat process for opposite bearing.

17. Adjust the belt tension.

18. Test run and retighten all setscrews and bolts; trim

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

After 24 hours of operation, retighten the setscrews to

the appropriate torque. This assures full locking of the

inner race to the shaft. Make sure the socket key or

driver is in good condition with no rounded corners. The

key should be fully engaged in the setscrew and held

squarely to prevent rounding out of the setscrew socket

when applying maximum torque.

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

excessive force is used in placing the pulleys on

their respective shafts.

7. Tighten in place.

8. 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.

An emery cloth or file may be needed to remove

imperfections 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,

setscrews, 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.

3. Remove the inlet cone.d. 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

puller. 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.

8. 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.

NOTICE! Do not hammer on the housing.

9. 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.

10. Align the setscrews on the bearings and tighten

one setscrew on each bearing.

11. Rotate the shaft to allow the bearing outer rings to

find their center of free movement.

12. Install the wheel on the shaft. Install the inlet cone

in its original location. And adjust bearing position

and inlet cone to center the wheel in the inlet cone.

13. Tighten hold-down bolts to proper torque.

14. Turn the shaft by hand. Resistance should be the

same as it was before hold-down bolts were fully

tightened.

15. Tighten bearing setscrews to specified torque.

Refer to the Torque chart.

16. Re-install the pulley and adjust the belt tension.

17. Test run and retighten all setscrews and bolts; trim

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

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Cook CP User Manual Page 8

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