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Komatsu PC490LC-10 Shop Manual page 21

Hydraulic excavator
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FOREWORD
★ Example of O-ring (Fitted to every joint of hoses and tubes)
★ For tightening torque, see the precautions for installation in each
section of "Disassembly and assembly".
18. When jump starting the machine, only use a machine of similar size
and voltage. Never use a arc welder or other electrical generating
equipment to jump start the machine. Carefully review the safety
and procedures for jump starting the machine.
PC490LC-10
SAFETY
00-7 b

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A40001