Oregon 530-120H Original Instruction Manual page 22

SETTING THE SHARPENING ANGLES
SETTING THE HEAD TILT ANGLE
Loosen the locking knob (J) at the
back of the motor unit (A)
Rotate the entire motor unit (A) until the
"10 DOWN" reference mark on the edge of the arm
is positioned at the desired head tilt angle (13)
22
Tighten arm locking knob (J) at the
back of the motor unit (A)
520-120 / 530-120H