Komatsu D155A-6 Operation & Maintenance Manual page 201

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OPERATION
OPERATION
REMARK
In the case of the multi-shank ripper, carry out ripping at right
angles to the slope face.
Cross ripping
On jobsites with hard bedrock, for rocks and boulders which are
impossible to break or dig up with one ripping pass, carry out the
second ripping pass at right angles to the first ripping direction.
At the edge of cliffs, where it is impossible to apply the ripper in
a cross direction, make the space between the shanks smaller
and carry out ripping.
During the ripping operation, if there is any hard bedrock, carry
out ripping in the opposite direction to the direction where the
ripper was applied. If it is still impossible to break up the rock,
break up the area around the bedrock a little at the time.
When carrying out concentrated ripping of hard bedrock, the
work efficiency is high if the ripper is applied to the whole of the
digging face.
DIGGING UP BOULDERS
During the ripping operation, if boulders are found which are difficult to break and shoe slippage occurs, dig up the
boulder as follows.
1. Depress the decelerator pedal and lower the engine speed to
a point where there is no shoe slippage.
3 - 150
OPERATION
OPERATION
(B)
Tilt back (MAX)
(1)
Slope face
(2)
Ripping base

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