PIPER
COMANCHE
SERVICE
MANUAL
9-78.
Overhaul. U during
the
aboye iDSpectiCII any indication
of
startin,
motor difficulty
IS
I1Ote-d,
the
starting
lDolOr
should be removed from tbe
eqiDe
for
cle."mg
and
repair.
9-79.
R
....
cwal.
To
remove
the
startinl
motor
from
the
al1line,
first
dilcOftaect
the
&round
cable
!rom
tbe
battery
post
to prevent sbort circuitiD&.
Disconnect
the
lead
from
the
starting
motor
terminal, then
take
out the
mOWlting
bolts.
The
motor
can
then be
lifted
off and taken
to
the
bench for overhaul.
9-80.
Dllal
....
ly.
•.
Remoye
the
frame
serews
from
the
commutator end
head
and
pull
end
head
and armature
from
frame. Lilt the
btushes
and lock in
elevated
position
with brush
sprin,s.
Use
a puller to
"'-
moye
the
end head
from
the
armature.
Use
a
special
bearing puller
to
remoye the
sealed
ball
bellnng
from [be armature shaft.
b.
Remove the frame screws that
secure
the
par
aouia,
to
tbe frame.
Rem
...
bolts
and
nuts
holdinl
the
par
housinl
to the pinion hOOlain,
and
separate
the
two Wlils.
Pull
Bendix
shaft
from
pinion housing.
Do
not
lose
the
steel
.pacer
that
is
located
on
the
pinion end of
the
shaft.
Remoye reduction
par,
woodruff key and
steel
spacer
from
shaft.
c,
Tum
the Bendix pinion Wltil
it
locks
in
the
extended
pOlition.
Locate
"spirol"
pin and
use a punch to remoye. SUde
drive
assembly
off
the
shaft.
Do not attempt to disassemble the
drive
and do 110t dip
it
in
cleaning
solvent.
d.
To
remove the
roller
bearings
from
the
&ear housing.
use
an arbor
press
and the
correct
bearing
arbor.
DO
NOT
HA.'dMER
OUT.
Each
part
should be
cleaned
and
inspected
for
excessiye
wear or damage Bearings should
be
checked
for proper
clearance
and
evidence
o( roughness
or
galling. Oil and dirt
should
be
removed.
from
insulation
and the
conditicn
at
the U1sulation
checked.
9-81.
BrUlh
...
Check the
brushes
to
see
that they
slide
freely
in
their
bolders and make full
contact
on
the commutator.
If
worn to
half
their
original length or
less,
they should be replaced.
9-82.
Annatur
••
a.
Check
the commutatei' for
W1even
wear.
excessive
&lainl
or
evidence
of
excessive
arcing.
If
only Slightly
dirty,
glazed
or
discolored.
the commutator
can
be
cleaned
with 00 or 000 sand-
paper.
If
the commutator
is
rough
or
wom. it should be turned in a
lathe.
Refer to Figure 9-29b.
The
armature
shaft
should
be
inspected
for rouch
beanng
surfaces
and rough or damaged
splines.
b.
To
test
the
armatwe
for grounds, a
set
of
test
probes
connected
in
series
WIth
a llt)..volt
light
should
be
used.
Touch one probe to a ccmmutator segment
ar..d
the other
to
the armature
core
If
the
test
lamp
lights,
the armature
is
grounded and
should
be
replaced.
c.
To
test
for
shorted armature Calls, a
powler
is
used.
(Refer
to Figure 9·291:.) The arma·
ture
is
placed
en the growler and slowly
rotated
by
hand while a
Iteel
strip
is
held over the core
50
that
it
passes
over
each
armature
core
slo['
If
a
coil
is
snorted, tne
steel
strip
WIll
vibrate.
d.
A quick
check
(or
opens
cllD
be
made
by
inspecting
the
tralling
edge
(in
direction
of
ro-
tation) of the commutator
segments
for
excessive
discoloration.
This
condition
indicates
an
open
cin:uit.
ELECTRICAL
SYSTEM
ISSUED:
8118n2
3
C16
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