Greenheck Downblast Centrifugal Roof Exhaust GB-240HP

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

Loosen identical fasteners on opposing side

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

Adjust and tighten belt as necessary

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. Do not use lubricant.

Select the mounting type for bushing and shaft key installation

Use the keyway setscrew to hold the shaft key and bushing in place, if present, but do not overtighten.

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)?

Enter the current running time of the motor in hours

Replace grease if running time exceeds 2000 hours and temperature is within limits

Inspect the following components for tightness and security

Adjust and tighten components as necessary