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5
2–Remove one set of blade clamps from the hub assembly. Blade
clamps are installed on the hub assembly at the factory with spacers
for shipping purposes. Remove and discard the spacers. Position
the blade clamps around the shank of a blade with the machined-
face end of the blade clamp against the blade safety shoulder. See
Figure 5. Large nylon cable ties can be used to hold blade clamps
on the blade during installation providing easier assembly.
3–Insert the blade with blade clamps around the shank and with
the concave blade side (TOP) on the discharge side between
the hub assembly plates as shown in Figure 4. Vertically align
the two bolt holes in the clamps and plates. Install two lubricated
C\v″ bolts, four C\v″ at washers, (two C\v″ lock washers if hardware ma-
terial is monel), and two C\v″ hex nuts, engaging the nuts only three
to four threads as shown in Figure 5. Do not tighten the hardware
until all the blades have been installed. The blade must be free to
rotate in the clamp for pitch adjustment.
4–Repeat until all blades, clamps, and hardware have been installed
in the hub assembly.
BLADE CLAMP
FLAT WASHER
MACHINE BOLT
FAN BLADE
HUB PLATE
HUB PLATE
FLAT WASHER
LOCKING HEX NUT OR
HEX NUT AND LOCK WASHER
Figure 5