Komatsu PC290LC-6K Operation & Maintenance Manual page 256

Hydraulic excavator
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30. EXTENDING MACHINE SERVICE LIFE
Moving the chisel while carrying out impacting operations
Holding the chisel horizontal or pointed up when carrying out impacting
operations
Twisting the chisel when it has penetrated the rock
Pecking operations
Extending the bucket cylinder fully and thrusting to raise the machine off
the ground
5-22

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