Hitachi ZAXIS 30U-5N Operator's Manual page 130

Disconnecting the booster cables
1. Disconnect black booster negative (-) cable (2) from
hinge (3) of the machine cover first.
2. Disconnect the other end of black booster negative (-)
cable (2) from the booster battery.
3. Disconnect red booster positive (+) cable (1) from the
booster battery.
4. Disconnect red booster positive (+) cable (1) from the
machine battery.
OPERATING THE ENGINE
3-8
1
Booster Battery
(Black)
2
To hinge (3) of the machine tank cover
(Red)
Machine Battery
Disconnect First
M503-03-002