Greenheck Fan HRE-20, 90, 55, 45 Lubrication, Dampers, Fan Belts, Fan Motors, Fan Wheel & Fasteners

routine maintenance

Lubrication

Check all moving components for proper lubrication.. Apply lubrication where required.. Any components showing excessive wear should be replaced to maintain the integrity of the unit and ensure proper operation..

Dampers

Check all dampers to ensure they open and close properly and without binding.. Backdraft dampers can be checked by hand to determine if blades open and close freely.. Apply power to motorized dampers to ensure the actuator opens and closes the damper as designed..

Fan Belts

Belts must be checked on a regular basis for wear, tension, alignment, and dirt accumulation.. Premature or frequent belt failures can be caused by improper belt tension (either too loose or too tight) or misaligned sheaves.. Abnormally high belt tension or drive misalignment will cause excessive bearing loads and may result in failure of the fan and/or motor bearings.. Conversely, loose belts will cause squealing on start-up, excessive belt flutter, slippage, and overheated sheaves.. Both loose and tight belts can cause fan vibration..

When replacing belts on multiple groove drives, all belts should be changed to provide uniform drive loading.. Do not pry belts on or off the sheave.. Loosen belt tension until belts can be removed by simply lifting the belts off the sheaves.. After replacing belts, insure that slack in each belt is on the same side of the drive.. Belt dressing should never be used..

Do not install new belts on worn sheaves.. If the sheaves have grooves worn in them, they must be replaced before new belts are installed..

Deflection = Belt Span 64

Belt Span

Proper fan belt settings

Fan Motors

The proper belt setting is the lowest tension at which the belts will not slip under peak load operation.. For initial tensioning, set the belt deflection at 1/64-inch for each inch of belt span (measured half-way between sheave centers).. For example, if the belt span is 64 inches, the belt deflection should be 1 inch (using moderate thumb pressure at mid-point of the drive).. Check belt tension two times during the first 24 hours of operation and periodically thereafter..

Motor maintenance is generally limited to cleaning and lubrication.. Cleaning should be limited to exterior surfaces only.. Removing dust and grease buildup on the motor housing assists proper motor cooling. Never wash-down motor with high pressure spray.. Greasing of motors is only intended when fittings are provided.. Many fractional motors are permanently lubricated for life and require no further lubrication..

Fan Wheel & Fasteners

Wheels require very little attention when moving clean air.. Occasionally oil and dust may accumulate on the wheel causing imbalance.. When this occurs the wheel and housing should be cleaned to assure smooth and safe operation.. Inspect fan impeller and housing for fatigue, corrosion or wear..

Routinely check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and accessories for tightness.. A proper maintenance program will help preserve the performance and reliability designed into the fan..

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