Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 7-1
2250 SERVICE/MAINTENANCE MANUAL POWER TRAIN
7
SECTION 7
POWER TRAIN
BATTERY MAINTENANCE
Safety Information
Avoid sparks while charging batteries. Do not disturb
connection between batteries until charger is off.
Another source of explosion lies in the reverse connection of
charging equipment. This hazard is present with all types of
chargers, but particularly in the case of high-rate equipment.
Carefully check the connections before turning the charger
on.
Improper use of a “booster” battery to start a crane when the
normal battery is inadequate presents a definite explosion
hazard. To minimize this hazard, the following procedure is
suggested:
1. First connect both jumper cables to the battery on the
crane to be started. Do not allow ends of cables to touch.
2. Then connect the positive cable to the positive terminal
of the booster battery.
3. Finally, connect the remaining cable to the frame or
block of the starting vehicle. Never connect it to the
grounded terminal of the starting vehicle.
If electrolyte comes in contact with eyes, skin, or clothing, the
area must be immediately flushed with large amounts of
water. Seek first aid if discomfort continues.
Causes Of Battery Failure
Overcharging
Overcharging is the number 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 resultant 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
Undercharging can cause a type of sulfate to develop on the
plates. The sulfate causes strains in the positive plates which
results in plate buckling. Buckled plates can pinch the
separators and cause a short circuit. An undercharged
battery is not only unable to deliver power, but may freeze
(see Table 7-1
).
Table 7-1
Battery Freeze Points
The sulfate condition can eventually be converted to metallic
lead which can short the positive and negative plates. These
small shorts can cause low cell voltage when the battery is
charged.
Lack of Water
The plates must be completely covered. If the plates are
exposed, the resultant high acid concentration will char and
disintegrate the separators. The plates cannot take a full
charge if not completely covered by electrolyte.
Hold-Downs
Loose hold-downs 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
resulting in high resistance battery connections. This
weakens the power of the battery. Overtightened hold-downs
can distort or crack the container and cause the same
problem.
Overloads
Avoid prolonged cranking or the addition of extra electric
devices which will drain the battery and may cause
excessive heat.
Multiple Battery System
Multiple battery systems are connected either in series or in
parallel. Always refer to your wiring diagram for correct
connection.
WARNING
Battery gases are explosive!
Batteries can explode with great violence and spraying of
acid if a spark or flame is brought too near them. The
room or compartment in which batteries are stored must
be ventilated and away from flames or sparks.
State of Charge
Specific
Gravity
Freeze Point
°F °C
100% 1.26 -70 -57
75% 1.23 -39 -38
50% 1.20 -16 -26
25% 1.17 -2 -19
DISCHARGED 1.11 +17 -8

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English