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ELECTRICAL
SYSTEMS
GENERATING SYSTEM
10-21
SECTION
10-D
GENERATING
SYSTEM
CONTENTS OF SECTION 10-D
Paragraph
Subject
Page
Paragraph
Subject
Page
10-23
The Generating System.
10-21
10-28
Generator Repairs-On
Ben ch
10-28
10-24
Description of Generator
..
10-21
10-29
Test
and Minor
Adjustment
10-25
Description of
Generator
of Generator Regulator-
Regulator
.
. .... . . .
.
.
.. .
.
.
10-22
On Car .
.
.
.. . .
.
.
.
.
.
10-30
10-26
Periodic Inspection and Test
10-30
Generator Regulator R
epairs-
of Generator-On Car.
10-26
On Bench
.
10
-34
10-27
Bench
Test of Generator .
. .
.
10
-28
SERVICE
BULLETI N REFERENCE
Bulletin No
.
Pa
ge
No
.
SUBJECT
10-23 THE
GENERATING
SYSTEM
The generating system restores to the bat-
tery the energy used in cranking the
engine.
It
also supplies current to carry the electrical load
of the ignition, lights, signalling devices, and
accessories, at operating sp
eeds
above 25 MPH
up to the limit
of
the
generator's capacity.
At
speeds below 25 MPH the output of generator
is not sufficient to carry the electrical load of
all units, t
herefore
the battery supplies the ad-
ditional
current
required.
The generating system consists of the gen-
erator (par. 10-24), generator regulator (par.
10-25), charge indicator, battery (par.
10-14),
the wires and cables connecting these
units,
and
the battery g
round
cable and ground through
engine crankcase
which completes the circuit.
See figure
10-15.
Th
e
charge
in dica t or indicates
charg ing
cur-
rent
going into the battery a
nd
t
he current
leaving
battery,
except when
cranking
the en-
gine
or
blowing th
e
horn. The charge
indicator
does not
indicate
charging
rate
of
g
en erator
sin ce
cur rent supplied
by generator to
elect rical
units
other
than th
e
ba tter y and horns do
es
not
pass
through
the
ind ica to r.
10-24 DESCRIPTION OF GENERATOR
The gen erator is a two-brush, two-pole
shunt
wound
unit.
1.948
Mo
del
ge
n erato r s a
r e
ca pable
of delivering 34 to 36 amperes when hot. 1949
Se
ries
.50-70 generators are capable of deliver-
ing 40 amperes .when hot.
The maximum output of generator is con-
trolled by the
current
regulator; however, the
generator
does not normally
deliver the
maxi-
mum output because
the
voltage r
egulator
con-
trols output in
accordance
with the require-
ments of the battery and the current consum-
ing units in op
erating.
See figure 10
-11
and
10-12.
The
generator
pulley
drives
a fan
which
draws a draft of air through the generator to
carry away
the heat
produced during opera-
tion.
This ventilation permits the generator
output to be inc rea sed to higher values than
would
be
possible in a
non-ventilated
generator
of the same size.
The armature shaft is supported by an an-
n
ular
ball bea r in g in the
drive
end fra
me
and a
bronze bush ing
in
the commutator end frame.
T
he
bearing
and the bushing are provided with
hinge
ca p oil cups for
periodic application
of 'a
few d
rops of
light engine
oil.
The t
wo brushes
are mount ed on a brush plate attached
to
the
commutator
end fra me and are held in contact
wit h
the
com m ut ator
by
spring loaded brush
a
r ms.
One
brus h
is
g
ro unde d
to
the
frame while
the ot he r br ush
is in su la t ed
fro
m
the
frame and
connected to
the
field
coils and t
h e a
r m
a t u r e
ter mi nal
post ("
A")
on th
e field
frame. The
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