Any battery which is known to be discharged or has a
stabilized voltage below 12.2 volts should be charged
as shown below.
12-VOLT MAINTENANCE-FREE BATTERY CHARG-
ING GUIDE
BOOST CHARGE If a battery requires a boost charge,
it should be charged at 45 amperes for 20 minutes.
This cannot be used for a new battery being prepared
for installation.
MODIFIED CONSTANT POTENTIAL TAPER
CHARGING It is recommended that maintenance-free
batteries be recharged on a modified constant poten-
tial taper chargers. The total charge must not exceed
the ampere-hour equivalent of the values shown in the
“Charging Guide”. It is recommended that the initial
charging rate not exceed 30 amperes.
MAINTENANCE AND LUBRICATION
ELECTRICAL SYSTEM COLLECTOR RING
ELECTRICAL COLLECTOR RING When trouble-
shooting the electrical system, always check the collec-
tor ring first to see that the spring-loaded brushes are
centered in the bands. Keep free of any foreign materi-
al.
Keep the set screws on the collector ring tight. Other-
wise the wire harness may wrap up as the machine is
swung.
The cover should allow for free operation of the collector
ring and the brake. If linkages bind, erratic operation
may result. Check for unrestricted operation.
COLLECTOR RING MAINTENANCE If not revolved for
some time, under some conditions, the ring will have a
tendency to collect fine silt, or salt atmosphere will
cause corrosion. If this happens, the crane should be
rotated through several revolutions if possible. The
cleaning action of the brushes should clean the ring sur-
faces. If it does not, or it is not practical to revolve the
machine, it may be necessary to use a standard non-
residue solvent to clean the ring. Then lightly sand the
brushes and rings with a fine grade of sandpaper and
dust off with compressed air.
Battery Capacity
(Reserve Minutes)
Above 125 to 170
Minutes
Slow Charge
20 Hours @ 5 Amps
10 Hours @ 10 Amps
NOTE: If a battery is to be charged overnight, (16
hours) a timer or voltage controlled charger is recom-
mended. If the charger does not have such controls, a
3 ampere rate should be used for batteries of 80 min-
utes or less capacity and 5 amperes for above 80 to 125
minutes reserve capacity batteries. Batteries over 125
minutes should be charged at the specified SLow
Charge rate.
4 - 29 Revised: March 2005RT700 Series
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