PAGE 42 — DIS185SSI4F AIR COMPRESSOR • OPERATION MANUAL — REV. #0 (12/19/16)
CHECKING BATTERY SPECIFIC GRAVITY
(250 HOURS)
1. To determine if the battery needs charging, measure
the
specific gravity
of the battery acid.
2. The relationship between battery charge (charging rate)
and specific gravity is shown in Table 11.
BATTERY CHARGING
1. Always remove the
BLACK
cable first. This cable is
connected to the
negative
terminal of the battery.
2. Next, remove the
RED
cable that is connected to the
positive
terminal of the battery.
3. Attach the
positive
cable clamp from the battery
charger to the positive post on the battery.
4. Attach the
negative
cable clamp from the battery
charger to the negative post on the battery.
5. To prevent an explosion, open all vent caps on the
battery so that the battery can discharge dangerous
fumes/gas properly.
6. Turn on battery charger and adjust as recommended
by battery manufacturer.
7. If battery fluid temperature exceeds 113° F (45° C),
stop charging and let battery cool.
8. Once the battery is
fully charged
, remove battery
charger cables from battery.
Table 11. Battery Fluid Temp./Specific Gravity
68° F
(20° C)
32° F
(0° C)
14° F
(-10° C)
Charging
Rate%
100%
1.28
1.29
1.30
90%
1.26
1.27
1.28
80%
1.24
1.25
1.26
75%
1.23
1.24
1.25
Each value has a deviation of ± 0.01
When the charging rate is below 75% , battery needs to be recharged.
NOTICE
Before charging, always make sure that both the
BLACK
and
RED
battery cables have been removed
from the negative and positive battery post. Failure
to remove these cables may cause damage to the
alternator.
MAINTENANCE (ENGINE)
9. Reconnect the
RED
battery cable to the positive post
on the battery.
10. Reconnect the
BLACK
battery cable to the negative
post on the battery.
NOTICE
When reconnecting the battery cables, always connect
the
RED
(positive) battery cable first.
Be careful of the polarity when reconnecting the
battery cables. Reversing the polarity could cause
serious damage to the alternator and other electronic
components.