Komatsu GD555-5 Operation & Maintenance Manual page 216

OPERATION
PRECAUTIONS WHEN HANDLING OR OPERATING SCARIFIER
If the scarifier is fully raised and the blade is lowered to raise the
body, the scarifier and drawbar will hit, and the drawbar will be
damaged.
If the blade is raised a few centimeters from the ground surface
and rotated, the blade and scarifier will hit, and the blade will be
damaged.
If the blade is set within the machine width and the scarifier is
lowered, the top of the blade and the scarifier will hit, and the top
of the blade will be damaged.
When carrying out bank cut operations, the scarifier is lowered to
prevent the contact between the drawbar and the scarifier. At this
time, be cautious as the scarifier possibly contacts and damages
the tires, depending on the conditions of the scarifier and the
irregularity of ground surfaces.
OPERATION
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