Reference
Only
Manitowoc
Published 05-16-17, Control # 233-03
7-3
999 SERVICE/MAINTENANCE MANUAL
POWER TRAIN
7
Causes of Battery Failure
A battery should never be left in a discharged state. When
discharged, it rapidly sulfates and unless recharged within
hours, will permanently lose capacity.
Overcharging
Overcharging is one cause of battery failure, and is most
often caused by a malfunctioning voltage regulator.
Excessive heat is the result of overcharging. Overheating
causes the plates to warp which can damage separators and
cause a short circuit within a cell. This bubbling and gassing
of the electrolyte can wash the active material from the
plates, reducing the battery’s capacity or causing an internal
short.
Undercharging or Discharged
Undercharging can cause a type of sulfate to develop on the
plates. The sulfate reduces battery capacity and causes
strains in the positive plates which cause plate buckling.
Buckled plates can pinch the separators and cause a short
circuit.
Furthermore, an undercharged battery is not only unable to
deliver power, but may freeze (see
Table 7-1. Battery Freeze Points
Lack of Water
The plates must be completely covered with electrolyte. If
the plates are exposed, the high acid concentration will char
and disintegrate the separators. The plates cannot take a full
charge if not completely covered by electrolyte.
Loose Hold-Downs
Loose hold-downs will allow the battery to vibrate in the
holder. This can cause cracks or wear in the container and
cause acid to leak. Leaking acid corrodes terminals and
cables, causing high resistance at the battery connections
which weakens the battery. Hold-downs can also distort or
crack the container.
Overloads
Avoid prolonged cranking or the addition of extra electric
devices which will drain the battery and may cause
excessive heat.
Multiple Battery System
The crane’s 24V system is powered by two 12V batteries
connected in series (
).
Always refer to wiring diagram for correct connections.
Be
careful not to reverse the battery connections.
Installing
batteries with reversed electrical connections will not only
damage batteries but also the crane’s electrical system,
voltage regulator, and/or alternator.
State of Charge
Specific
Gravity
Freeze Point
°F (°C)
100%
1.26
-70 (-57)
75%
1.23
-36 (-38)
50%
1.20
-15 (-26)
25%
1.17
-2 (-19)
0%
1.11
18 (-8)
Summary of Contents for 999
Page 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 999 ...
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Page 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
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