SPX Cooling Technologies MARLEY HP700 - Manual (Page 7)

7
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
Note
Marley HP7000 fan blades are manufactured to equal moment weight
and blade clamps to equal static weight. The blades and clamps
can be installed in any position without affecting fan balance.
At the end of the blade shank on a nameplate is inscribed a let-
ter code (i.e. “A” or “B” etc.). When installing or replacing blades
use only blades with the same letter code.
1–Lubricate the 3/4 ″ bolt and 3/4″ hex-nut threads with thread lu-
bricant. Set the hardware aside.
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 4. 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 5 and Figure 6. Vertically align
the four bolt holes in the clamps and plates. Install four lubricated
3/4
″ bolts, eight 3/4″ flat washers, (four 3/4″ lock washers if hard-
ware material is monel), and four 3/4 ″ 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.
Fan Blade Installation