Loren Cook Company Ventilation Fan 270SQN-B

Loosen setscrew on motor pulley

Adjust the groove facing to change the pitch diameter

Ensure RPM limits of the fan and the horsepower limits of the motor are maintained

Retighten pulley setscrew on one of the flat areas of the motor shaft

Check for proper belt tension after adjustment

Push bearing cover toward the wheel

Remove any burrs from the shaft by sanding

Slide new bearings onto the shaft to the desired location and loosely mount bearings onto the bearing support

Correctly position the wheel and tighten the bearing bolts securely to the bearing support

Align setscrews bearing to bearing and secure tightly to the shaft

Inspect the wheel position again. If necessary, readjust by loosening the bearing bolts and setscrews and repeat from step 5.

Ensure fan bearings are prelubricated

Check for any specialized lubrication instructions on fan labels

Verify bearing grease is a petroleum lubricant in a lithium base conforming to an NLGI #2 consistency

Is the lubricant compatible with the installation?

Adjust lubrication interval based on installation conditions

Lubricate the bearing while the fan is in operation

Pump grease in slowly until a slight bead forms around the bearing seals

Remove pulleys from their respective shafts

Clean bores of pulleys and coat the bores with heavy oil

Remove grease, rust, or burrs from the pulleys and shafts

Remove burrs from shaft by sanding

Place fan pulley on fan shaft and motor pulley on its shaft

Install belts on pulleys and align as described in Belt and Pulley Installation

Adjust and tighten belt as necessary

Record any issues found during inspection