Komatsu PC220LC -8 Operation & Maintenance Manual page 254

OPERATION
Booster Cable Connection
Keep the starting switch of the normal machine and problem machine in the OFF position.
Connect the booster cable as follows, in the order of the numbers marked in the diagram.
1. Connect the clip of booster cable (A) to the positive (+) terminal
of battery (C) on the problem machine.
2. Connect the clip at the other end of booster cable (A) to the
positive (+) terminal of battery (D) on the normal machine.
3. Connect the clip of booster cable (B) to the negative (-) terminal
of battery (D) on the normal machine.
4. Connect the other clip of booster cable (B) to the revolving
frame (E) of the problem machine.
Starting the Engine
Always check that the lock lever is set to the LOCK position, regardless of whether the machine is working normally or has failed.
Check also that all the control levers are in the neutral position.
1. Make sure the clips are firmly connected to the battery terminals.
2. Start engine of the normal machine and run it at high idle speed.
3. Turn the starting switch of the problem machine to the START position and start the engine.
If the engine doesn't start at first, try again after 2 minutes or so.
Booster Cable Disconnection
After the engine has started, disconnect the booster cables in the reverse of the order in which they were connected.
1. Remove one clip of booster cable (B) from the revolving frame
(E) of the problem machine.
2. Remove the clip of booster cable (B) from the negative (-)
terminal of battery (D) on the normal machine.
3. Remove the clip of booster cable (A) from the positive (+)
terminal of battery (D) on the normal machine.
4. Remove the clip of booster cable (A) from the positive (+)
terminal of battery (C) on the problem machine.
WARNING
TROUBLES AND ACTIONS
3 - 199