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40
Electrical
System
Tractors,
Lawn
and
Garden
- 110
and
112
15-6
Charging
System
SM-2059-(Apr-67)
TESTING
ARMATURE
M
5769
Fig.
9-Checking
Armature
lor
Short
Circuits
Test
the
armature
for
opens,
shorts
and
grounds
as
follows:
1.
SHORTS
-
Short
circuits
are
located
by
rotating
the
armature
in a
growler
with
a
steel
strip
(hacksaw
blade)
held
on
the
armature.
The
steel
strip
will
vibrate
on
the
area
of
the
short
circuit.
2. GROUNDS -
Grounds
in the
armature
can
be
detected
by
use
of a
test
lamp
and
prods.
Tf
the
lamp
lights
when
one
test
prod
is
placed
on
the
commutator
and
the
other
test
prod
on
the
armature
Core
or
shaft.
the
armature
is
grounded.
3.
OPENS
-
Inspect
the
points
where
the
conductors
are
joined
to
the
commutator
for
loose
connections.
Poor
connections
cause
arc-
ing
and
burning
of
the
commutator.
Refer
to
repairs,
page
15
-10,
if
armature
has
loose
con-
nections.
IT
the
commutator
is
worn,
dirty,
out
of
round,
or
has
high
insulation,
the
commutator
should
be
turned
down
and
w1dercut.
Litho
i.n
U,S,
A.
M
5710
Fig
.
IO-C/,e
cki
ng
Ar
ma
tu
re
lor
Grounds
TESTING
VOLTAGE
REGULATOR
The
proper
testing
equipment
in
the
hands
of
a
qualified
mechanic
is
necessary
to
assure
proper
and
accurate
regulator
settings.
Any
at-
tempt
on
the
part
of
untrained
personnel
to
ad-
just
regulators
is
likely
to
lead
to
serious
dam-
age
to
the
electrical
equipment.
After
making
any
generator
or
regulator
tests
or
adjustments
,
the
generator
s
hould
be
polarized
to
avoid
damage
to
equipment.
See
page
15-18
.
In
analyzing
complaints
of
voltage-regulator
operation,
any
of
sever
a l
basic
conditions
may
be
found.
1.
Battery
Remains Charged
with
Low
Water
Usage
-
This
indicates
normal
generator-
regulator
operation.
Reglliator
settings
may
be
checked
as
outlined
in
the
follow-
ing
sections.