Komatsu PC16R-3 Operation & Maintenance Manual page 284

Hydraulic excavators
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PRECAUTIONS TO BE TAKEN WHEN USING OPTIONAL EQUIPMENT
WRONG USAGE
To ensure long machine life and safe work, the following operations should be avoided.
Do not operate all cylinders to the end of their strokes. Always leave approximately 5 cm to spare.
q
Using the mount to gather in pieces of rock
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Operations using the swing force
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Moving the tool while it is hitting the material to be broken.
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Holding the chisel horizontal or pointed up when carrying out
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impacting operations.
Twisting the chisel when it penetrates the rock
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