Manitowoc Published 10-09-2020, Control # 259-06 7-3
MLC80A-1/MLC90A-1/MLC100A-1/MLC100-1 SERVICE/MAINTENANCE MANUAL POWER TRAIN
This open-circuit test is the simplest test, but not as accurate
in determining a battery’s condition as a hydrometer test.
The advantage is that the cell covers do not need to be
opened, eliminating the possibility of cell contamination and
electrolyte spillage.
NOTE: Do not use this test method if the battery has been
recently charged by a charger or alternator. Recent
charging places a high surface charge voltage on
the battery, which is not a true indication of actual
battery voltage.
Table 7-2. Open Circuit Voltage
Consult the manual provided with the test meter for detailed
test information.
Troubleshooting—Slow Cranking
If the starter cranks too slowly and the battery is charged and
in good condition, do a voltage-drop test to make sure that
the starter connections are good.
When cranking, a voltage drop of more than 0.6 volts
between the starting motor cable and ground can cause hard
starting regardless of a battery’s condition. The voltage drop
can be caused by a poor contact between the cable terminal
and ground or between the clamp terminal and the battery
post. Also, poor start-switch contacts and frayed, broken, or
corroded cables can be the cause.
Charging
NOTE: If the crane is equipped with the optional charger,
see Battery Charger (optional) on page 7-4
.
1. Remove the battery or disconnect all the crane wiring
from the battery.
2. Read and follow the charger manufacturer’s
instructions.
NOTE: The battery should be at room temperature when
recharging. Never attempt to recharge a frozen
battery.
3. Clean the top of the battery to help prevent dirt from
entering the cells.
4. Verify the plates are covered with electrolyte. If the level
is low, add distilled water to bring the level just to the top
of the plates. Use a clean funnel. Re-check the
electrolyte level after charging.
• The maximum charge rate in amperes should be no
more than 1/3 of the battery’s reserve capacity
minute rating.
NOTE: The Deka 908D battery originally supplied with the
crane has a reserve capacity rating of 430 minutes.
• Do not exceed 13.8 volts for long periods and 14.4
volts for short periods (8 hours maximum).
• Charge until a 2-hour period results in no increase in
voltage or decrease in current.
NOTE: Overcharging shortens a battery’s life.
If the battery becomes hot to the touch or if it gases
violently, temporarily halt charging or reduce the
charging current.
Storage
When the crane is left idle for prolonged periods, the
batteries should be periodically charged.
When storing batteries, make sure they are fully charged to
prevent sulfation and the possibility of freezing.
Follow your battery dealer’s recommendations.
State of Charge Specific Gravity
Approximate
Open-Circuit
Voltage
(24 V system)
100% 1.260 25.2
75% 1.230 24.8
50% 1.200 24.4
25% 1.170 24.0
0% 1.110 23.6
Item Description
1 Test Leads on Battery Terminals
2 Voltmeter
FIGURE 7-2
WARNING
Personal Injury Hazard!
Exposure to battery electrolyte can cause severe burns. If
electrolyte comes in contact with eyes, the area must be
immediately flushed with large amounts of water.
Always wear eye protection when servicing batteries.
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