Loren Cook Company Ventilation Fan 150SQN-B

Slowly remove wheel from the shaft

Use Lisle No. 45000 Sterling Wheel Puller

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

Motor Bearings with Sleeve Bearings

Verify lubrication instructions on motor nameplate

Has the unit been stored for a year or more?

Is the unit operating under severe conditions?

Add LIGHT grade mineral oil or SAE 10W oil (up to 30 drops)

Motor Bearings without Sleeve Bearings

Are the motor bearings grease lubricated ball or roller bearings?

Are the motor bearings without provisions for relubrication?

Is the unit operating under severe conditions, high temperatures, or excessive contaminants?

Inspect bolts and setscrews for tightness. Tighten as necessary. Refer to Recommended Torque chart.

Inspect belt wear and alignment. Replace worn belts with new belts and adjust alignment as needed. Refer to Belt and Pulley Installation.

Inspect bearings as recommended in the Conditions chart.

Inspect for cleanliness. Clean exterior surfaces only. Removing dust and grease on motor housing assures proper motor cooling.

Inspect fans exhausting corrosive or contaminated air within the first month of operation.

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?

Relubricate bearings according to the condition chart

Lubricate the bearing while the fan is in operation

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