Greenheck Downblast Centrifugal Roof Exhaust GB-180

Inspect bolts, setscrews, and motor mounting bolts

Adjust and tighten 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 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 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 non-functional (fuses removed, disconnect locked off)

Are grease fittings provided on the motor?

Is the motor temperature below 104ºF (40ºC)?

Grease the motor according to the manufacturer's recommendations

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

Remove fuses and lock off the disconnect

Clean the wheel evenly to prevent imbalance

Clean the housing to remove oil and dust accumulation

Ensure safety precautions are in place around moving parts

Gather necessary tools and materials, including a hand grease gun and high-grade lithium base grease

Inspect the following before lubrication

Set hand grease gun to a maximum of 40 psi

Rotate bearings during lubrication if safety permits

Pump grease slowly until a slight bead forms around the seal

Ensure no over-packing or contamination occurs during lubrication