2. An overcharged battery as evidenced
allowed to rise above the "Operating
by excessive battery water usage.
Range" for any length of time.
The conditions can be caused by (1) a
It should be noted that the voltage may
defective battery, (2) poor circuit con-
be below the "Operating Range" if the
nections and (3) defective alternator.
b a t t e r y i s in a low state of charge.
as the battery receives a
However,
Since the battery may have
BATTERY.
charge, the voltage will rise to some val-
an internal defect, it must be checked to
ue within the "Operating Range".
determine its condition. Use a voltmeter
and h y d r o m e t e r to check the condition of
OPERATING
RATED
SYSTEM
RANGE
Make sure the battery is
the battery.
VOLTAGE
VOLTAGE
fully charged.
26.0-30.0
28.0
24
Poor con-
CIRCUIT CONNECTIONS.
The rotor normally retains magnetism to
nections i n t h e a l t e r n a t o r c a n c a u s e a n
provide voltage build-up when the en-
undercharged condition only.
Carefully
After disassembly or
gine is started.
inspect all connections including grounds
s e r v i c i n g , h o w e v e r , it may be necessary
between the alternator and battery for
to reestablish the magnetism. To magne-
insure that
cleanliness and tighteness.
connect t h e i n t e g r a l
rotor
the
tize
the battery cable clamps are clean and
charging system to the battery in a nor-
tight, and that the battery is dry and
mal manner, then momentarily connect a
clean.
jumper l e a d f r o m t h e b a t t e r y p o s i t i v e
post to the integral charging system re-
ALTERNATOR.
If the battery and cir-
lay terminal, identified in Figure 10D-11.
cuit connection checks are satisfactory,
This procedure applies to both negative
the alternator may be checked either on
and positive ground systems, and will
or off the crane by making connections
restore the normal residual magnetism in
shown i n F i g u r e 1 0 D - 1 2 o n p a g e
as
the rotor.
Assemble a closed end terminal
10D-11.
hole to output
with
1/2 inch
clip
Trouble in the crane
PROCEDURES.
terminal, then connect ammeter lead clip
charging will be indicated by one of two
to this terminal clip.
conditions:
1. With all accessories and carbon pile
1. An undercharged battery as evi-
turned off, increase engine speed as re-
denced by low specific gravity reading
maximum
obtain
voltage
quired to
and slow cranking.
reading.
Figure 10D-11. Alternator
10D-10