RedMax BCZ2500S/SU Owner's/Operator's Manual page 14

8. Operation
F2
14
ADJUSTING THE ANGLE OF THE CUTTING
BLADES (F2)
1. Stop the engine.
2. Turn the bolt located on the top of the trimming
mechanism counter-clockwise to loosen it.
3. Adjust the angle of the blades to the desired
angle, and then fix the bolt firmly back into place.
(1) Clamp lever
(2) Trimming mechanism