Komatsu PC400LC-5 Operation & Maintenance Manual page 139

Disconnecting the booster cables
After the engine has started, disconnect the booster cables in the
reverse of the order in which they were connected.
Remove one clip of booster cable @from the engine block of the
problem machine.
Remove the other clip of booster cable @ from the negative 0
terminal of the normal machine.
Remove one clip of booster cable @from the positive @terminal
of the normal machine.
Engine block of the problem machine AD05298,
Remove the other clip of booster cable @ from the positive @
terminal of the problem machine.
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