Greenheck Downblast Centrifugal Roof Exhaust GB-480

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.

Disconnect and secure all electrical power to the fan.

Ensure the unit is made non-functional (fuses removed, disconnect locked off).

Are grease fittings provided on the motor?

Does the motor temperature exceed 104ºF (40ºC)?

Replace the grease if the motor has run for 2,000 hours and temperature does not exceed 104ºF (40ºC).

Ensure the following are in place after maintenance

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

Ensure motor plate slides on slotted adjusting arms

Lubrication Frequency Assessment

Select the type of service environment

Ensure the use of a good quality lithium base grease, conforming to NLGI Grade 2 consistency

Was the lubrication process completed successfully?

Check for any unusual noise or vibration after lubrication

Describe any issues encountered during lubrication

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

Adjust and tighten belt as necessary