Komatsu D155A-6 Operation & Maintenance Manual page 192

OPERATION OPERATION
3. Operate parking brake lever (4) to the LOCK (L) position.
4. Operate blade control lever (5) and ripper control lever (6) to
LOWER position (c) and lower the blade and ripper to the
ground.
5. Place blade control lever (5) and ripper control lever (6) at
HOLD position (b).
6. Set work equipment lock lever (7) to the LOCK position (L).
OPERATION OPERATION
3 - 141