Loren Cook Company AC Exhauster ACE-B

Warning: Stop the fan before inspection

If fan is not operational, report the issues to the maintenance team and stop the procedure

Adjustments made during inspection

1. Clean the motor and fan shafts.

2. Loosen the motor plate mounting bolts to relieve the belt tension. Remove the belt.

3. Loosen the pulley setscrews and remove the pulleys from the shaft. If excessive force is required to remove the pulleys, a three-jaw puller can be used. This tool, however, can easily warp a pulley. If the puller is used, inspect the trueness of the pulley after it is removed from the shaft. The pulley will need replacement if it is more than 0.020 inch out of true.

4. Clean the bores of the pulleys and place a light coat of oil on the bores.

5. Remove any grease, rust or burrs from pulleys.

6. Place the fan pulley on the fan shaft and the motor pulley on the motor shaft. Damage to the pulleys can occur when excessive force is used in placing the pulleys on their respective shafts.

7. After the pulleys have been correctly placed back onto their shafts, tighten the pulley setscrews.

Warning: This procedure requires trained personnel with PPE!

Is the motor a Direct Drive 1050/1075,1200,1300 &1500 rpm unit?

If yes, proceed with the following steps. If not, skip to step 7.

Has the unit been stored for a year or more?

Is the unit in severe conditions?

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

Does the motor have grease lubricated ball or roller bearings?

If yes, proceed with the following steps. If not, skip to step 12.

Are the bearings without provisions for relubrication?

Warning: This procedure requires trained personnel with PPE!

New bearings slid onto the shaft and loosely mounted

Wheel correctly positioned and bearing bolts tightened securely

Setscrews aligned and secured tightly to the shaft

NOTICE! Never tighten both pairs of setscrews before securing bearing mounting bolts. This may damage the shaft.

Wheel position inspected again and readjusted if necessary

Sign off on the fan bearing replacement

Warning: This procedure requires trained personnel with PPE!

The correct wheel-to-inlet clearance is critical to proper fan performance.

Verify the wheel-to-inlet clearance before initial start-up.

Adjust the overlap by loosening the wheel hub and moving the wheel along the shaft to obtain the correct value.

Check if the overlap has been adjusted correctly.

A uniform radial gap is obtained by loosening the bearing bolts and set screws which will allow for correct repositioning.

Check if the radial gap is uniform.

Sign off on the fan wheel-to-inlet clearance adjustment