Replace The Battery - Yanmar 6SY Series Operation Manual

Servicable Batteries Only
Measure the specific gravity of the battery
with a hydrometer.
When the specific gravity of the fluid is
1.28 at 20°C (68°F), 1.294 at 0°C (32°F),
1.308 at -20°C (-4°F) the battery is fully
charged. When the specific gravity is
below 1.20, charge the battery.
A discharged battery will freeze at -5°C
(23°F). If the specific gravity cannot be
raised by charging, the battery must be
replaced.
Do not rapid-charge the battery.
Rapid-charging eventually results in
damage to the battery.
Note: The capacities of the standard
alternator and the
recommended battery assume
only the power necessary for
regular operation. If the power is
also used for lighting or other
purposes, the generating and
charging capacities may be
insufficient. In such cases, see
your authorized Yanmar marine
dealer or distributor.
Maintenance-free batteries can be
checked using a battery tester. See your
authorized Yanmar marine dealer or
distributor.
6SY Operation Manual
PERIODIC MAINTENANCE

Replace the Battery

A
WARNING
• Stop the engine and turn the
starter switch key to the OFF
position before checking or
servicing the battery.
• Be sure to wear safety goggles
when handling a battery.
• To disconnect the terminals,
begin with the negative
terminal (ground side); to
connect the terminals, begin
with the positive terminal. If a
tool touches both the positive
terminal and the machine,
hazardous sparks may be
generated.
• If a terminal is loose,
hazardous sparks may be
generated due to poor contact,
which could cause ignition and
explosion. Be sure to securely
connect the terminals.
0000118en
107