Ubiquiti Networks PowerBea ac - Manual (Page 13)

15. Before adjusting the tilt angle, ensure that the six Hex Head
Bolts are loose enough to allow movement.
IMPORTANT: If you cannot spin the washers freely by
hand, then loosen the Hex Head Bolts until you can.
16. To adjust the tilt angle, turn the screw head of the elevation
rod until the desired tilt is reached.
17. Lock the alignment by tightening all six Flange Bolts to
25 N-m.