Installation Manual 5000MM
Page 4 of 9
May 2019
Install clamp bolts through hub plates and blade clamp, putting
bolt heads on top, lock washers and nuts on bottom. Tighten
lightly (See Figure 5).
SET PITCH AND TRACK
Use Hudson EXACT
-
A
-
PITCH
®
digital protractor (See Figure
6) to set blade pitch. Mount protractor on the trailing edge
of the blade and ensure that protractor is long enough to
reach at least half across the blade chord. Place the pro-
tractor 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 at mid
-
point
between high and low readings, and set pitch at that point.
Figure 5
Figure 6
Rotate blade in clamp until digital protractor shows specified
pitch angle to /
-
0.2°.
Fan pitch angle is shown on fan
specification 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 outward so
that the blade neck flange rests against the back of the blade
clamps. Push blade to the right to remove all slack.
Use torque wrench to tighten clamp bolts per Table 1 below:
Re
-
check pitch setting. Blade must be set /
-
0.2° of de-
sired pitch angle. Tighten clamp bolts evenly.
DO NOT OVER
-
TORQUE CLAMP BOLTS.
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
the instructions above. After tightening bolts, mark top end of
each blade in same place first blade was marked. If marks
differ by 1" or more, adjust blade.
CHECK TRACK
After fan is installed in fan stack cylinder ring, outline top side
of each blade onto fan stack cylinder ring with a marker (See
Figure 7). The difference between levels of highest and lowest
outlines should not be more than 1". Correct blade track by
loosening clamp bolts and adjusting blade to match track of
other blades. Re
-
tighten bolts and re
-
check track and pitch
angle setting. Re
-
tighten blade clamp bolts to recommended
standard per Table 1.
Figure 7
Clamp Bolt Type
Torque Value (ft
-
lb)
Lubricated
Dry
Grade 8, EcoGuard®
n/a
220
Table 1: Clamp Bolt Torque Values
