SPX Cooling Technologies MARLEY 07-1126 - Manual (Page 8)

8
Installation
The drive shaft end must remain recessed at least 1 ⁄
32
" in the hub
bore to prevent dangerous rotor vertical translation once retaining
bolt
16 has been tightened to the shaft end.
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.
Caution
Warning