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B. Position airfoils
Slide the airfoils onto the tabs of the fan hub. Do not fasten the
airfoils to the hub with hardware at this step.
The airfoils must be attached to the fan hub with the curved sides
facing downward.
C. Attach airfoils to hub
Moving clockwise around the fan hub, position the airfoil retainers end-over-end and loosely secure them with the
Airfoil Hardware. Hole A of the retainer should be positioned over top of Hole B.
Do not fully tighten the bolts until
all the airfoil retainers have been attached!
After all retainers are positioned, fully tighten the bolts along the outer perimeter to 29 ft·lb (39.3 N·m) using a
torque wrench and 1/2” socket. After the outer perimeter bolts are torqued, tighten the bolts along the inner
perimeter to 29 ft·lb (39.3 N·m).
Airfoil Hardware:
a. (16) 5/16-18 x 2’’ GR 8 Bolt
b. (40) 5/16” Flat Washer
c. (20) 5/16-18 Nylon Insert Lock Nut
Hole A
Hole B
Airfoil Retainer
c
b
a
b
c
b
a
b
