Komatsu D155A-6 Operation & Maintenance Manual page 177

OPERATION OPERATION
3. Operate blade control lever (3) and ripper control lever (4) to
the RAISE position, raise the blade 40 - 50 cm (15.8 - 19.7 in)
from the ground, and raise the ripper to the maximum height.
4. Turn fuel control dial (5) to the full speed (MAX) position, raise
the engine speed, and fully depress decelerator pedal (6).
5. Move joystick to the F (FORWARD) or R (REVERSE) position,
gradually release decelerator pedal (6) and allow the machine
to move.
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OPERATION OPERATION