Installation Manual 8000 Page 3 of 8 January 2004
INSTALL BLADE INTO HUB
Hoist the blade into position. (Blade and clamp halves weight about
300 lbs.) Slide blade clamp into blade arm plates and install four
(4) blade studs, eight (8) lockwashers and eight (8) nuts (See
Figure 2). Tighten lightly.
Figure 2
SET PITCH AND TRACK
Use Hudson EXACT-A-PITCH® digital protractor (Shown in Fig-
ure 3) or a bubble protractor to set blade pitch. Mount protractor
on a flat bar as a base and place it approximately 1” from tip of blade.
Note pitch on protractor. Rotate fan 360⋅, noting high and low pitch
readings. Locate place where pitch reading is a mid-point between
high and low readings, and set pitch at that point.
Rotate blade in clamp until digital protractor shows specified pitch
angle to within ±0.2⋅. (Fan pitch angle is shown on fan specifica-
tion sheet for design duty.)
After desired pitch angle is set, raise and lower end of fan blade
and find midpoint of blade travel. Hold blade at the midpoint. Pull
blade back so that it sits against blade clamp. Push blade to the
right to remove all slack.
Use torque wrench to tighten clamp bolts to recommended stan-
dard of 280 ft-lb (lubricated) or 300 ft-lb (dry). Recheck pitch
setting. Blade must be set within ± 0.2⋅ of desired pitch angle.
Tighten clamp bolts evenly. DO NOT OVER-TORQUE CLAMP
BOLTS.
Figure 3
When bolts are tightened, hold a pencil against top end of blade and
mark the level onto a fixed object, such as a pole or the fan ring.
Install remaining blades at same place as first blade, following pro-
cedures above. After tightening bolts, mark top end of each blade
in same place first blade was marked. If marks differ by 1-1/2”or
more, adjust blade.
CHECK TRACK
After fan is installed in fan ring, outline top end of each blade onto
fan ring with a marker. The difference between levels of highest
and lowest outlines should not be more than 1-1/2”. Correct blade
track by loosening clamp bolts and adjusting blade to match track
of other blades. Retighten bolts and recheck track and pitch angle
setting. Retighten blade clamp bolts to recommended standard of
280 ft-lb (lubricated) or 300 ft-lb (dry) torque (See Figure 4).
Figure 4
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