Fan Blade Installation
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.
FLAT WASHER
HUB PLATE
| HUB PLATE | |
| FLAT WASHER | |
FAN BLADE | MACHINE BOLT | 7 |
| |
