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70
V. ELECTRICAL
I.
Checkin/1, carbon brushes
Check
the bru,hes
and
springs
for
conditio11
Brushes
that
are worn or pilled badly, or
those which
do not
aligit with the commutator
bars
should be
replaced with
new ones, Discard
the springs if they
are weak so that
the brushes unable to rest on tl1e
commutator.
I-
Carbon brush
length
I
mm(in.)
Brush
spring tension
gram
'Z.
('leanmg commutator
-
- ~
Standard value
Repair li111it
11
-
125
5 (0.020)
(0,433-0.492)
max.
495
605
Sand off all
burrs,
copper dust or
uny
other foreign
particles with a fine emery clotlt Wip<:
it
clean before
iosrnllation..
3. Checking field coil
for
continuity
Check fo, continuity between U,e
brushes
connected
to
the field coil and starting motor cable.
lf there is
no
continuity, it is a reliable indication that
the
field coil
h:is an open
circulL
4.
Checking armature
coil
for
continuity
A shorted or grounded armamre
would
affect the proper
operation of
U,e
starting motor. The armature
is
tested
electricolly
for ground
by
placing one
test prohc
oil
the
taminaled
cort
and
the
ol..her on
the
commutalOr
bars.
If there
is
continuily.
the ::lrmature is grounded
Starting magnetic switch
TI1e starling
motor
dra\VS a
large
amount of current
as
high
as
I
OOA when cr;1,n king the
Crlg.ine.
The electromagnetic swicch
serves
lhe
purpose o
f remotely switchmg on and off the
starting moror.
-
-
A
~·
-"\
':.
/,..
.,,
.
. .
\
'
.
/
. ,
..
,~-,,-<
I-
..........
_
_
.: .
•
1'
41
" -
•
I
.
r'
v t
,1
.
I
'
·::.1
-·
~,
Fig. 5-23
(I)
Carbon brush
(2) Brush spring
(3) Commutator
.,...,.
__
_..
Fig.
S-24
Checking stator coil
Fig.
5-25
Checking armature
<.:oil
m--
m
-
: ~ :
.. · __ ....
·1
'
(Ii
~1·
.11
- - ~ ~ -
-
,
___
.
Fig.
5 26
(I)
Stopp<,-r
(2)
Slapper
holder
(3) Washer
(4)
Roller
A
(5) Contact s'J)ring
(6)
Flat
washer
(7) Plunger holde,-
(8)
i , -
shaft
(9) PIU!l#f
(II)
'
I
ll)
/
...
.....
.
(
1)
;
__
- (
Ut
i
ll
)
(I
0) Cbntact bolt
(I
1)
case
(12)
Contact plate
( 13) Yoke
(14) Chi\ bobbin
(l 5)
Coil oomp!ete
(16) Remrn spnng
(17)
Body
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