Greenheck Downblast Centrifugal Roof Exhaust GB-360HP

Check belts for wear and tightness.

Verify belt type matches the original unit specification.

Loosen the tensioning device to allow removal of the belt by hand.

Adjust belts as shown in 'Pre‑Starting Checks'.

Check pulley setscrews for tightness.

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, 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)?

Enter the current running time of the motor in hours

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

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.

Limit cleaning to exterior surfaces only.

Remove dust buildup on motor housing to ensure proper motor cooling.

Was the cleaning performed evenly to avoid out of balance condition?

Was the maintenance performed by qualified personnel familiar with local codes and regulations?

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

Is the lubrication process completed successfully?

Check for any unusual noise or vibration after lubrication

Describe any issues encountered during lubrication