Yanmar 3TNV Series Service Manual page 45

2. Inspection and Adjustment
Battery structure
(1) Electrolyte level
Check the level of fluid in the battery.
When the amount of fluid nears the lower limit, fill
with battery fluid (available in the market) to the
upper limit. If operation continues with
insufficient battery fluid, the battery life is
shortened, and the battery may overheat and
explode.
Battery fluid tends to evaporate more quickly in
the summer, and the fluid level should be checked
earlier than the specified times.
If the engine cranking speed is so slow that the
engine does not start up, recharge the battery.
If the engine still will not start after charging,
replace the battery.
Remove the battery from the battery mounting of
the machine unit after daily use if letting the
machine unit leave in the place that the ambient
temperature could drop at -15
store the battery in a warm place until the next use
the unit to start the engine easily at low ambient
temperature.
(2) Battery charge
Use a battery tester or hydrometer and check the
battery condition. If the battery is discharged,
recharge it.
(a) Measurement with a battery tester
When checking the battery with the batter tester,
connect the red clip of the tester to the battery positive
(+) terminal and black clip to the battery negative (-)
terminal by pinching them securely, and judge the
battery charge level from the indicator position.
Green zone: Normal
Yellow zone: Slightly discharged
Red zone: Defective or much discharged
or less. And
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