Komatsu D155AX-8E0, Operation & Maintenance Manual

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4.
If you cannot break or dig up the boulder by repeating step
3, perform the following operation.
1) Move back approximately 10 cm, and then raise the
shank.
2) Move forward around rocks and boulders you cannot
rip, and restart ripping.
PRECAUTIONS WHEN RIPPING
• For the digging angle when ripping, set that the upper part
of the shank is vertical, then lower the ripper.
• Do not continue ripping for a long time with the ripper
shank tilted back. The tip of the point will wear to a round
shape.
• If the machine is steered during ripping, the shank may be
broken.
Before steering, pull the shank out of the ground.
• Never travel the machine in reverse while ripper point (1)
is in the rock-bed. The pin mounting point (1) will break
and point (1) will fall off.
Stop the machine, tilt back the shank a little, and then
raise the ripper slowly.
• After ripping, if the crushed rocks are relatively large, avoid
traveling over the ripping path (2) when traveling in re-
verse.
At this time, check the rear side carefully to avoid hitting
any large rocks. As far as possible, select a level ground to
travel over in reverse.
(3): Reverse travel direction
MACHINE OPERATIONS AND CONTROLS OPERATION
3-198