PIPER
COMANCHE
SERVICE
MANUAL
317
G".OUND
,
.,.
SPRING
S
BATTERY
0
'-----'GIA~OU;:lN~D:_::~==\\;:.;:;!J~~TACHOMEi'
STARTING
MOTOA
aATTl!RY
h:::;:h<iGIAOUND
1
GAOUND
STARTlNG
MOTOR
FIGURE
9-29
•.
Nc)'L.OAD
TEST
HOOKUP
FIGURE
9·291.
STAL.L.·TOIIQUE
HOOKUP
play
sbould
be
.005 to .050 of
an
iIIcb.
b.
New
brushes
should
be
properly
seated
"he.
,:wtaIUIl&by "rappin& a
strip
of
00
sandpaper
ar",,1Id the cammutator (with the
sandilll
side
OI1t)
1.25
to
1.50 tilll
••
Maximum.
Drop
brusbes
on
sandpaper
coverod Ctlllfllutator and
tum
the
.....
tuN
slowly in the direction
of
rotation.
Dust
sbould
be
blown out of the motor
after
sandina.
NOTE
Tbe
spring
tension
is
32 to 40
ouaces
with new brusb
••.
This
ten-
sion is measured with the scale hooked under the brush sprine near
the brusb and the
:eadiog
is
taken
It
right angies
to
the
line
of
force
exerted
by
the
brush spring.
c.
Check
the
position
of the plnioo to be
sure
the
unit
.,ilI.mesh
properly with
the
flywheel
ring
gear. See
spec
ifieations
for
wut
fex
correct
dimensions.
Refer
to
paralraph
9-90.
9-88.
aench T
..
t._
a. After the
starting
motor
is
reassembled,
it
sbould be
tested
to
see
that the no-load current
at a
certain
YoLta,e
is
within
specificatials
as
&iven
in
parasrapb
g...90.
To
make
this
test
I con-
neet
.s
shown in
Ficure
9-2ge. U current is too higb.
check
the
bearing ali&Mlent and
e,d
play
to
make
sure
there
is
no
bindine
or
interferencer. Two or three sbarp raps on
the
frame with a raw-
hide hammer ...
ill
often
help
to
alien
the
!leanap
and free
the
armature.
b.
If
no
difficulty
is
indicated
in
the above
test,
a
stall
torque
test
may
be made to
see
if
the
startinl
motor
is
producine
its
rated.
crankinc
power.
M:ake
test
connectiena
as
shown in
Figure
9-29f.
c.
If
torque and
cunent
..
e not within
specifications.
check
the
seatine
of
the
brushes
and
intemal
conneaions
[or hich
resistance.
If
these
cbecks
are
!Dade
and found to
be
in
IOod.
order.
replace frame and field assembly and
retest
starter.
EL.ECTRICAL.
SYSTEM
ISSUED:
8/18172
3
C18
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