Yanmar 3JH4E Service Manual page 40

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
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
Terminal
Battery
case
° C or less. And store
24
Cap
Cover
Cathode
plate
Separator
Glass mat
Anode plate
GREASE
Upper limit
UPPER LEVEL
LOWER LEVEL
OK Too low
Electrolyte level
Battery tester
Battery charge measurement
(
with battery tester
Lower limit
Excessive
)