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number 3RAR9 or equal.

10. Reapply beeswax to protect the set screw heads.

11. Install the new shaft by sliding the bearings to the

desired location using the measurement record earlier

and loosely mounting the bearing support. Bearing

bolts and bearing set screws should be loose enough

to allow shaft position later. Please note the wheel to

inlet clear matches as close as possible the diagram

on page 3

12. Tighten all hardware per the torque values as stated

on page 4 and follow the Operation Pre-Start Check

and Start-Up listed in this document.

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.

Maximum Fan RPM

Troubleshooting

Low Capacity or Pressure:

• Incorrect direction of rotation. Make sure the fan ro-

tates in same direction as the arrows on the motor or

belt drive assembly.

• Poor fan inlet conditions. There should be a straight

clear duct at the inlet.

• Improper wheel alignment.

Excessive Vibration and Noise:

• Damaged or unbalanced wheel.

• Belts too loose; worn or oily belts.

• Speed too high.

• Incorrect direction of rotation. Make sure the fan ro-

tates in same direction as the arrows on the motor or

belt drive assembly.

• Bearings need lubrication or replacement.

• Fan surge or incorrect inlet or outlet condition.

Size

Maximum RPM

FCP FCP 66

120 4500 4500

150 3600 4300

180 2900 3600

245 2200 2700

270 2000 2400

300 1800 2200

330 1650 2000

365 1500 1800

Overheated Motor:

• Motor improperly wired.

• Incorrect direction of rotation. Make sure the fan ro-

tates in same direction as the arrows on the motor

or belt drive assembly.

• Cooling air diverted or blocked.

• Improper inlet clearance.

• Incorrect fan RPMs.

•Incorrect voltage.

Overheated Bearings

• Improper bearing lubrication

• Excessive belt tension.