Greenheck Downblast Centrifugal Roof Exhaust GB-200

Fasteners and Setscrews Inspection

Check all fasteners and setscrews for tightness

Does the wheel rotate freely and is it aligned as shown in Figure 7?

Was the wheel position verified for movement during shipment?

Loosen the set screws in the wheel and move the wheel to the desired position for centering height alignment.

Loosen the setscrew holding the bushing and shaft key in place, if present.

Loosen and remove the socket head cap screws fastening the bushing to the hub.

Select the mounting type for socket head cap screws installation

Tighten the socket head cap screws an eighth of a turn at a time, alternating between them until the hub comes loose from the bushing.

Clean all surfaces of hub and bushing to remove any oil or residue.

Select the mounting style for bushing installation

Use the keyway setscrew to hold the shaft key and bushing in place, if present, without overtightening.

Loosen tension enough to install belts without stretching

Adjustment for Two Groove Pulleys

Adjust tension to be equal in both belts

Check pulleys for proper alignment

Loosen four fasteners on the drive frame

Disconnect all electrical power to the fan and secure to the 'off' position.

Ensure the unit is made non-functional by removing fuses and locking off the disconnect.

Are grease fittings provided on the motor?

Replace grease in motors where temperatures do not exceed 104ºF (40ºC) after 2,000 hours of running time.

Verify the following are in place after maintenance

Is the fan operating without vibration?

Adjust belt tension after the first 24-48 hours of operation

Adjust and tighten belt as necessary