Komatsu PC118MR-8 Operation And Maintenance Manual page 82

SAFETY MAINTENANCE INFORMATION
PRECAUTIONS CONCERNING THE BATTERY AND THE ALTERNATOR
q When the electrical system is being repaired or when
electric welds are made, turn the battery main switch to
OFF (O) to interrupt the current (see "Battery main switch
(3-68)"
q If electric welds are necessary for the machine, besides
disconnecting the battery, disconnect the alternator, the
KOMTRAX system control unit and the ECUs of the
machine controllers.
PRECAUTIONS CONCERNING THE STARTER
q Start the engine only when correctly seated in the driving
position.
q Do not start the engine by tampering with the terminals of
the starter, since the machine may move.
q Sudden or accidental movements of the machine may
cause serious injuries or even death.
CHEMICAL HAZARD
q During maintenance or dismalting operations, where there is a risk of contact with hazardous chemival
substances, relevant safety precautions should be taken. If any doubt exists, contact your Komatsu distributor. 
See also disposal of "WASTE MATERIALS" (2-56)
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SAFETY
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