Installation

The drive shaft end must remain recessed at least 1⁄32" in the hub Cautionbore to prevent dangerous rotor vertical translation once retaining

bolt 16 has been tightened to the shaft end.

Warning	Never power the drive shaft with bushing bolts not torqued or
	bushing improperly positioned.

4––Install the blade.

Sandwich the blade shank between the pillow blocks 4 and 5, en- suring both the pins 7 are in proper position (Figure 2).

Fit pillow blocks 4 and 5, pins 7, pillow block plate 6, blade and pillow block fasteners 15 on hub disk as shown in previous Figure 3 without tightening bolts.

Rotate fan to check tip clearance is in accordance with the specified value (tip clearance ratio x/D, where x = the distance from the blade tip to the fan ring and D = the rotor diameter). The gap between blade tip and fan ring must be measured along blade axis.

Tighten the pillow block bolts 15, to hold the blade in extended position, leaving enough clearance to allow blade rotation on its own axis for pitch setting.

5––Setting blade pitch.

The pitch angle of each blade has to be set at the A° value specified in the rotor identification plate with a 0.5° maximum tolerance: in order to set the pitch, the quotes shown in following Figure 3 must be observed; note these quotes are shown on the fan data sheet, and are specific for each diameter of the Marley Ultra Low-Noise fan.