Komatsu D31EX-21, Operation & Maintenance Manual, Page: 173 / 256

OPERATION
TROUBLESHOOTING
3-121
REMOVE AND INSTALL BATTERY 3
1. Open the battery cover (1), then remove 4 nuts (2) of the
battery mounting holder.
2. Before removing battery, remove the ground cable (nor-
mally connected to the negetive (-) terminal). If any tool
touches between the positive terminal and the chassis,
there is danger of sparks being generated. Loosen the nuts
of the terminal and remove the wires from the battery.
3. After installing the battery, fix it with the battery hold down.
Tightening torque: 3.92 to 5.88 N·m (0.4 to 0.6 kgf·m)
4. When installing the battery, connect the ground cable last.
Insert the hole of the terminal on the battery and tighten the
nut.
Tightening torque: 5.9 to 9.8 N·m (0.6 to 1.0 kgf·m)
PRECAUTIONS FOR BATTERY CHARGING 3
If the battery is charged improperly, it may explode. Accord-
ingly, charge it according to “IF BATTERY IS DISCHARGED
(3-120)“ and the instruction manual attached to the charger,
and observe the following items.
q
Set the voltage of the charger to match the voltage of the
battery to be charged. If the correct voltage is not selected,
the charger may overheat and cause an explosion.
q
Connect the positive (+) charger clip of the charger to the
positive (+) terminal of the battery, then connect the nega-
tive (-) charger clip of the charger to the negative (-) termi-
nal of the battery. Be sure to fix the clips securely.
q
Set the charging current to 1/10 of the value of the rated battery capacity; when carrying out rapid charging,
set it to less than the rated battery capacity.
If the charger current is too high, the electrolyte will leak or dry up, and this may cause the battery to catch fire
and explode.
q
If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source.
There is a hazard that this will ignite the battery electrolyte and cause the battery to explode.
q
Do not use or charge the battery if the battery electrolyte level is below the LOWER LEVEL line. This may
cause an explosion. Always check the battery electrolyte level periodically and add distilled water to bring the
electrolyte level to the UPPER LEVEL line.