Greenheck Downblast Centrifugal Roof Exhaust GB-330

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 until the hub comes loose from the bushing.

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

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.

Ensure the fan is turned off and locked out for safety

Gather necessary tools and materials (hand grease gun, lithium base grease)

Inspect the following before lubrication

Set hand grease gun to a maximum of 40 psi

Rotate bearings during lubrication if safe to do so

Pump grease slowly until a slight bead forms around the seal

Ensure no over-packing or contamination occurs

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?

Is the wheel position correct after shipment?

Center height alignment by loosening set screws and adjusting wheel position

Inspect bolts, setscrews, and motor mounting bolts

Adjust and tighten bolts, setscrews, and motor mounting bolts as necessary

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 without any issues?

Check for any unusual conditions

Describe any unusual conditions observed during lubrication