Aerovent IM-171 - Manual

Assembly Procedures
1. Lay hub on a horizontal surface with openings of
shank sockets (Fig. 3) facing up. This is normally
the discharge side of the assembly.
2. Lay blade shank in socket with discharge side of
the blade up. The discharge side of the blade is
the side with the angle setting mark. Line up the
index mark on the blade with the proper angle
mark on the end of the shank socket (Figs. 2 and
4) on the underside of assembly.
3. Place cap over blade shank with beveled end
toward center. Install U-bolts and elastic nut stops.
Before tightening lock nuts, pull the blade outward
to set the key against the keyway and check angle
setting (Fig. 3).
4. Tighten elastic stop nuts evenly and torque to the
following foot-pounds:
PROPELLER HUB U-BOLT TORQUE
DIA. DIA. SIZE (FT/LBS)
54" – 72" 14" 1/2" 20
81" – 96" 18" 3/4" 45
5. Check angle setting to be sure it has not changed
during assembly. If so, loosen lock nuts and reset
angle. Tighten nuts again to proper torque. Do not
over-tighten. Be sure to tighten U-bolts evenly.
Setting Angle With Protractor (optional)
Under most conditions, the preceding assembly pro-
cedure using the index marks is of sufficient accu-
racy. When greater accuracy is desired, use a level
bubble protractor. Before the final tightening of the
nuts, set the protractor on the angle setting mark.
(The hub and blade assembly must be level for accu-
rate setting.) Adjust the angle by tapping the shank
end with a mallet. Tighten lock nuts to proper torque.
Again check the angle setting. Rotate propeller to
check angle on each blade in the same location.
Propellers may be assembled so the cap side of
the hub is the inlet side (reverse bore). If blades do
not have the index mark on the discharge side, it is
then necessary to adjust the blade angle with a pro-
tractor.
The hub and blades are balanced separately. The
weight distribution throughout the length of the blade
varies slightly. Therefore, the balance is to a constant
moment and blades may be assembled at random
even though the weights are slightly different.
Adjustable Pitch Propeller Taper-Lock Hub
Reversible Propeller
©1997 Aerovent
Cap and U-Bolt Side Lock Nut Side
Angle setting index on shank socket. Marked
from 10° through 50°. Each mark is 2°.
Elastic Stop Nuts
Index Marks
Blade
U-Bolts
Cap
Blade
Shank
Hub
Fig. 1
Fig. 2
Fig. 3
General Installation, Operation and Maintenance Instructions For Aerovent Products
IM-171
June 1997
®
Fig. 4
Angle
Setting
Mark
Index
Mark
Inlet Side Discharge Side