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ROUTINE MAINTENANCE
Proper fan belt settings
Belt Span
Deflection =
Belt Span
64
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.
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.
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 Motors
Motor maintenance is generally limited to cleaning and lubrication. Cleaning
should be limited to exterior surfaces only. Removing dust and grease buildup
onthemotorhousingassistspropermotorcooling.Neverwash-downmotor
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.