Komatsu D155A-6 Operation & Maintenance Manual page 203

OPERATION OPERATION
Do not carry out ripping for long periods with the shank tilted
back (B). The tip of the point will wear to a round shape.
Do not change the direction of travel during the ripping
operation. This will cause breakage of the shank. When
changing the direction of travel, remove the shanks from the
ground before turning.
Never drive in reverse when the ripper point is inserted in the
bedrock. The pin installing the point (1) will break and the point
will fall off.
Stop the machine, tilt back (B) slightly, then raise the ripper
slowly.
After ripping, if the broken rock is comparatively large, avoid
traveling over the ripping path (2) when traveling in reverse.
When traveling in reverse (3), check the rear carefully to avoid
heating any large rocks. As far as possible, choose level ground
to travel over.
If ripping operations are carried out with the shank at the
maximum length on bedrock, the point will not penetrate the
ground properly. This will cause an increase in the load and may
lead to breakage of the shank. For this reason, avoid carrying
out operations on bedrock with the shank at the maximum
length.
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OPERATION OPERATION