AAON LN-140 User Manual
Page 28
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Multi-Wing W Series Black Glass
Reinforced Polypropylene Fan Blade Pitch
Angle Setting Instructions
Contact the AAON parts department to
acquire the new pitch pins for the fan blades.
Note original position of retaining plates,
center boss and all hardware including
additional hardware used for balancing.
1. Remove all the bolts and nuts.
2. Determine blade rotation – on the
concave side of the blade is a blade marking
showing 6WR, 6WL, 7WL, 7WR, or 9WR.
The “L” and “R” denote the rotation of the
blade.
3. Replace the pitch insert in the blade root
with an insert of the desired pitch.
Figure 12 - Pitch Insert
4. Replace blades to their original location.
5. Replace all nuts, bolts, and washers on the
fan hub.
6. Replace retaining plates and center boss
to original location.
7. Tighten nuts and bolts to 14 ft-lbs of
torque.
Fan Assembly Bushings
The fan assembly bushings should be
tightened to the specifications listed in the
following table.
Table 5 - Fan Assembly Bushing Torque
Specifications
Bushing
Tightening Torque
(in-lbs.)
H X 1.125"
95
H X 1.375"
95
SH X 1.125"
108
SH X 1.375"
108
SD X 1.125"
108
SD X 1.375"
108
SD X 1.625"
108
SD X 1.875"
108
SK X 2.125"
180