Hubs are shipped from the factory with the rod end set for the blade angle indicated by the design performance. A change in blade
angle is sometimes necessary, however, to adjust to actual site conditions. Failure to adjust the blade angle when required may
result in blade or motor overload.
To adjust, loosen the Clamp Bolts just enough to allow the blade to be turned. Place an inclinometer on the flat surface of
the root section as shown in the illustration above. Turn the blade until the desired angle is achieved.. Make a permanent record
of the final angle selected and take care that all blades on the fan are set at the same angle. A typical adjustment may be +/- 3°
from design angle (+/- .5° tolerance blade to blade). The maximum recommended blade angle is 30°. Please consult the
factory if it is desired to go above this.
Retighten the Clamp Bolts To 60 FT-LBS (8.3 M-KG).
Recheck each blade angle after tightening.
WARNING: The fan is designed to consume the horsepower stated on the Fan Specification Sheet. Too great an increase in
blade angle can cause serious blade overload which will stall the blades. In this condition, the fan will actually deliver less air
and blade life may be shortened.
.25” MAX Clamp Bolts
Moore fan blades are carefully balanced to the same moment at
the factory.
Proper installation, with particular attention to
tightening bolts to the specified torque, is essential to
maintain the design integrity of these units.
Install one blade: Clean any dirt or grease from the rod
end and the surfaces of the mounts. Align the rod end hole with
the holes in the mounts and insert the blade mounting bolt first
through the mount with the recess to accept the bolt head, then
through the rod end hole and screw the bolt into the second
mount lightly. The blade mounting bolt is supplied from the
factory with grease on the threads and conical face. Do NOT
clean the grease from the bolt.
Complete the installation of one blade by holding
the blade so that the blade extends straight out from the rod
end. Holding the blade in this position, tighten the bolt
using a torque wrench set to 200 ft-lb (27.6 m-kg) making
sure the rod end and the mounts seat.
After installing the first blade, manually rotate the fan
to be sure the blade clears the ring or throat at all points. When
the blade is held in alignment with the rod end (that is, straight
outward from the hub), it should clear the fan ring by a
distance adequate to provide for any relative motion between
the fan wheel and the ring. Excess clearance between the blade
tips and the ring, however, should be avoided to prevent
backflow which seriously reduces fan efficiency. If clearance
is excessive, the diameter may be adjusted at this time.
Install the remaining blades so that they are identical
with the first blade. Torque all bolts to 200 ft-lbs (27.6 m-
kg).
