PIPER
COMANCHE
SERVICE
MANUAL
a.
When
ill5talliDI a battery, always
."Ilul
absolutely
sure
the
ground polarity
01
the
battery
...
d the ground polarity
01
the alter-
aator
are
the
lame.
b,
When
connectiDl a booster battery, make certeiD to canDect the
nelative
battery terminals
tapther
and the
positive
battery ter-
minals toaether,
c,
When
cOMeclin1 a
charier
to the battery,
cODDeet
the
charier
positive
lead to the battery
positive
terminal
aDd
the
char,er
nel'"
tive
lead
to the battery negative terminal,
d,
Never operate the alternator on open c:ircuit. Make abaalutely
certain
all
conaections
in
the
circuit
are
secure.
e.
Do not short
across
or "owuI
""y
of
the terminals OD the alter-
aator
or
repletor.
L
Do
not attempt
to
palari:e
the alternator.
9-46.
Te.t
And
Maintenance
Of
Alternatar.
(O.lc
..
".,
.y)
9-47.
In.pectlon. Even though the
alternator
is
consttucted
to
give
lon&
periods
01
trouble-lree
service,
a regular inSpeetiOD procedure should
be
followed to obtain. the
maximum
life
from
the
altemator.
The frequency
01
inspection
is
determined
laraely
by
the
type
01
operatinl
conditions.
High speed operation, high temperatures,
..
d
dust
""d
dirt
all
incre
..
e the
.ear
01
brushes,
slip
riDls and bearinlS.
At
regular
intervals,
inspect
the terminals for
corrasioa
and
loose
cOftDections, and the
.irinllor
Irayed
insulation.
Check
the
mOUDlinl
bolts
lor
tightness,
and the belt lor alillllment.
proper tension and wear.
Belt
tension should be
adjusted
in
accordance
with
enpae
manufacturer'S
recommendations.
When
tighteniDI
belt
tnaion,
apply
pressute
against
the
stator
laminations
be~
tween the end frames. and not
against
either
end frame.
Noise
from
an
alternator
may
be
caused
by
.om
or
dirty
bearings,
loose
mounting bolts, a
loose
drive pulley, a
delective
diode, or a
delective
st.'or.
9-48.
Di.a
•••
tnltly. After extended periods of operation. or
at
time
of
engine overhaul. the alter·
nator
may
be removed
from
the
aireraft
for a
thoroulh
inspection
and
cleaaJnI
of
all
parts.
The
altemator
consists
of four main components - the two end frames. the
stator
and the rotor.
To
disassemble
the alternator, take out
the
lour thru-bolts, and
separate
Ihe drive end
Irame
and
rotor
assembly
from
the
stator
assembly by Pryinl aparr with a screwdriver
al
the
stator
slot.
A
mark
will
help locate the
parts
in
the
same
position
duriDg assembly.
The
lit betw
..
n
stator
and frame
is
n.ot
tight. and the two can be
separated
easily.
Note that the
separation
is
to
!>e
made between
the
stator
Irame
""d
drive el!d frame. Alter
disassembly,
place
a
piece
of tape
over the slip
rinl
end frame
bearinl
to prevent entry of dirt and other
loreil"
material. and
also
place
a piece of
tape
over the
shaft
on the Slip riD, end. U brushes are to be re-used.
clean
with
a
soft
dry
cloth.
CAUTIOH
Use
pressure
sensitive
tape
and not friction
tape
which would
leave
a
gummy
deposit on
the
sbalt.
3
89
ELECTRICAL
SYSTEM
ISSUED:
8118172