MAINTENANCE AND ADJUSTMENT
speed
rises
to and above 4500 rpm; and then
read
the
voltmeter
and
ammeter
wh.en
the
Starter
is
s
pinning
.
The
l1TUI1e:t.er
should
sh.ow
th31
the
starter
is
drawing
not
more
than
50
amperes. with the voltme
ter
indicating at least
23
voUs
(al
Ihe
speed
of
at
least
4500
rpm);
if not,
estimale the c
ause
of
the trouble by
consulting
the troubleshooting guide, which
follows:
St
a
rt
er
troubleshooting
gu
ide
Symptom
Possible cause
1.
Beari
ng
s
are
di
rty
lor
need
lubrication.
2. R
ot
or
(arm
a
ture
core) is
Large
curren
t
rubbing the pole pieces.
and
low
speed
3. Grounded coil
in
the annalure
or
in the field.
4.
Short-circuH
in
the annature
coils.
1.
Magnetic switch
is
grounded
and
is
nol
working
.
Large
curronl
2. Grounded coil
in
the
armature
but no
sp
ee
d
or
in
the field.
3.
Se
ized be.nng.
1. Open-circuited coil
in
the
armature
or
in
the
field.
No
current
and
2. Broken brush pigtail.
no
sp
e
ed
3.
No
conduction between brushes
and
conunulator because
of
"high mica" condition or dirty
commutator
surface
.
Small
current
Loose coil connect
ion
in
the field.
and
low speed
Very
large
cur-
rent
and
very
Short-circuited
field
coil.
high
speed
-
The best
wa.y
of
testing me slarter is
to
run
it
under
loaded
condition
~
but
that
requires
special
testing equipment. For o
rdinary
s
e.rvicing
pur
-
pose.s,
the
n
o
~o.d
test
and
troubleshooting
guide will do.
(2) Inspection after disassembly
80
(a)
Che
ck the armature coils and commulalOr for
ground.
open
and
short.
A
ciroCuit
tester
will
se
rv
e the purpo
se
of
checking the coils and
commutator
for
gr
o
und
and
op
en.
To
check
for
short
, howeve
r,
the
"grow
l
er
"
must
be
used.
Testi
ng
armature
coils
and
commutator for
ground and open
Testing armatu
re
for
shon
with growler
(b) lnspect the commutator surface for burning
and
"high mica" condition. Surface bums
can
be
removed
by
turning
the commutator
in
a
l'the
provided
thai
ther. is enough stock
10
be
removed by machining without exceeding (h,
limit diameler [43.2 mm
(1
.
701
in_
)).
"High
mica" must
be
corrected by undercutting the
mica
between commutator segment5. Inspect
th
e
risers
and
, if
their
solder
is
found
melted,
repair them by
re-s
oldering.
Check
the
commutator
for
radial
runout
and,
as
ne
ce
ssary
,
repair
it
by
turning
in
a
lath
e.
Unit: mm (in.)
Item Standard
Re
p
air
Lim
it
limit dia.
Commutator
0.03
0.1
43.2
runout
(0
.0
0118) (0.0039)
(1.701)
-
To Next Page
Loading...
Need help?
General
