Loren Cook Company AC Exhauster ACRU-B

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.

It is recommended the following inspections be conducted twice per year.

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

• Inspect belt wear and alignment. Replace worn belts with new belts and adjust alignment as needed. Refer to Belt and Pulley Installation, page 4.

• Bearings should be inspected as recommended in the Conditions Chart.

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

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?

Enter the amount of LIGHT grade mineral oil or SAE 10W oil added (in drops)

Does the motor have grease lubricated ball or roller bearings without provisions for relubrication?

If yes, contact the maintenance department to disassemble and lubricate the bearings. If not, proceed to step 10.

Sign off on the maintenance department's work

Warning: This procedure requires trained personnel with PPE!

Loosen setscrew on driver (motor) pulley and remove key, if equipped.

Inspect for proper belt tension.

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

Sign off on the fan shaft speed changing

Warning: Stop the fan before inspection

Adjustments made during inspection