MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
466
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Below 1.220 to 1.100
Overdischarging, low
concentration, or other faults
Check after charging
Specific gravity difference for
each cell being above 0.04
Possible fault of single cell
Check after charging
Table 11-1-6 Voltage measurement
Voltage
Judgement
Treatment
Above 12.5 V
Normal
12.5 to 11.5 V
Undercharging
Recharging
Below 11.5 V
Overcharging or internal fault
Check after charging
Table 11-1-7 Capacity measurement
Capacity detector showing
Judgement
Treatment
White area
Sufficient
Green area
Normal
Yellow area
Recharging required
Recharging
Red area
Fully discharged
Check after charging
Fig. 11-1-2 Checking the electrolyte specific gravity
of storage battery
4. Checking the Storage Battery
Remaining Capacity
(1) Checking the electrolyte specific gravity with a
specific gravity meter
As the electrolyte specific gravity increases after
charging and decreases after discharging, the
remaining capacity can be estimated according to
the specific gravity. Based on experience, 0.01g/
cm
3
of specific gravity decrease equals to 6% of
the discharging capacity of storage battery, so if
the specific gravity is known when storage battery
is sufficiently charged, the discharging rate can be
roughly calculated according to the electrolyte
specific gravity measured.
如
:For example: the
specific gravity is 1.28 when the storage battery is
sufficiently charged, but the measured value is
1.20, so the storage battery has been discharge by
48%.
Rubber ball
Rubber tube
Specific gravity
meter core
Glass tube
Storage battery
Electrolyte
