Hitachi ZW 310-6 Operator's Manual page 186

Fuse Box
IMPORTANT: If a fuse blows, turn the key switch OFF.
After checking and correcting the cause of the
trouble, replace the fuse with a new one.
The slow blow fuses (fusible links) (1 and 2) function as
a "safety valve" to prevent excess current from flowing
through, and to protect the electrical system.
The fuse capacity varies depending on its corresponding
circuit. Be sure to replace the blown fuses only with the
specified one.
When checking fuses, check the fuse A, B and slow blow
fuses in the battery box (1 and 2) in this order.
1- 120 A x 2
2- 70 A, 140 A
OPERATOR'S STATION
1-124
Fuse box A
Machine
Front side
Battery box
1
2
Fuse box B
90Z7B-FuseBox
90Z7B-SlowBlow