6
Supreme Exhaust Fan Maintenance
The exhaust fan should be inspected and serviced at least every two months as follows:
CAUTION: MAKE SURE THE POWER TO THE EXHAUST FAN IS TURNED “OFF” AT THE DISCONNECT
SWITCH BEFORE WORKING ON THE EXHAUST FAN. WHEN ELECTRICAL CIRCUIT TESTING IS REQUIRED,
IT SHOULD BE PERFORMED ONLY BY QUALIFIED SERVICE PERSONNEL. EXTREME CARE MUST BE EXER-
CISED WHEN WORKING WITH LIVE ELECTRICAL CIRCUITS!
1. Rotate and open the wheel access cam latch and lift the blower wheel out of the blower housing. Install the blow-
er wheel access security pin. Visually inspect the wheel for debris (such as paper towels, cook’s hats, etc.) and
remove if found. If grease build-up has occurred, scrape and clean the wheel and housing thoroughly to ensure
quiet and efficient operation. Remove the access security pin, lower the blower wheel and engage the cam latch.
2. Loosen the (2) wing nuts on the sides of the motor cover and lift the motor cover to gain access to the motor,
pulleys, belt and fan bearings. Install the motor cover support arm for safety to ensure the motor cover will not
drop while working on the motor and drive assembly.
3. Check the belt tension and wear. Adjust the belt, if required, or replace the belt if excessive wear or cracking is
apparent.
4. The motor has pre-lubricated bearings that require no additional lubrication for normal operation.
5. The blower wheel bearings are equipped with grease fittings. Grease should be added per chart in GBD catalog.
Add grease SLOWLY with shaft rotating until a slight bead forms at the seals, DO NOT OVER-FILL! ...over filling
will rupture the seals, eventually causing damage to the bearings. Use only grease rated for 1000 degrees F.
Use a good lubricant such as a premium lithium complex NLGI #2 bearing grease, lithium base and mineral base
oil. Always use grease from the same chemical group. Mixing different types of grease can greatly lower its
chemical and mechanical stability.
6. Replace the motor cover support arm in its clip and lower the motor cover. Tighten the motor cover wing nuts.
Turn “ON” the electrical disconnect switch.
7. Inspect the fan discharge grease reservoir for any grease residue. If grease has accumulated, place a large con-
tainer under the valve outlet and open the valve to drain. Close the valve. NOTE: THIS RESERVOIR IS MANU-
FACTURED IN A WAY TO ALLOW RAIN WATER TO RUN OUT ONTO THE ROOF BUT WILL RETAIN THE
GREASE WITHIN THE RESERVOIR.
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