-26-
(B-138)
(B)
It
no distortion test set i s au.ilable, the
&}ring
tension should be
17
to
19
ozs.; except when coils
are
connected
in
parallel without
a
1000
ohm
shunt. Urder this latter corxlition the tension should be
13
to
15
ozs.
'l'o
adjust, loosen the spring
arm
mounting �mt
ard
position the spring
arm.
Then tighten the JJIOU.I!ting nut. Rehook the
arma
ture lever spring.
SELECTOR
ARJ.{ OPERATIR1 SCREW ADJUSTMUT
(Figure
46)
See Note (A)
With the selector magnet energized
and
the selector cam sleeve
rota
ted
so that the armature lever is opposite
an
indent of its cam, there should
be a
clearance of
.003"
to
.006•
between the selector
arm
operating screw
and
tbe
selector
arm
.
'lo
adjust, loosen the sel.ector
arm
operatiJ:..g screw lock
nut
aDd
position the screw; then
ti&hten the
lock nut.
SEI:BCTOR
ARll
SPRING TENSION (Figure
47)
See lote (A)
Unhook
tae selector
8l"'ll
atop
detent a:triD&•
With the
ll"JJI&ture
lewr
on a
.high
part
ot i
t
a
cam ,
hook
an
8
oz.
scale
over the
end
ot
tbe
l
o
cld.Dg
wedge
and.
pull
parallel to the selector
arm
spring.
It
should require
1-l/4
to
1-3/4
ozs. to start the selector
arm moving.
Replace the detent spring.
STOP
LEVER
ECCEH'miC
�REW ADJUSTMENT
(Figure 48)
See
Note (A)
The stop lever
an
the range finder assebly should overtravel the
latching face of the trip latch by not .more than
.006•.
To adjust, loosen the
stop lever eccentric screw lock nut
and
position the screw; then tighten the
nut,
making
certain that the tightening of the nut does not disturb the
adjustment.
'l'RIP
LATCH SPRIID COMPRESSION
(Figure 48)
See Note (A)
When measuring this requirement, ·the r�e tinder assemb.q should
be
held
in
a horizontal
posi.
tion.
�
the push end
of
an
8
oz. scale, held
in a
vertical. position, to the trip latch, as near
to
the stop
lever
as possi ble. It
should require
1
to
1-1/2
ozs. , when pushing
upward, to
start the trip latch
moving.
STOP 1&VER
SPRING TENSION
(Figure 38)
S
e
e Note (A)
MOTE: Be
sure that the
atop
lever
eccentric
has been
adj
us
ted bet
are
check
ing
this requirement.
With the trip latch plunger held operated, hook
an
8
oz.
scale
on the
erd ot the stop lever of the range
t
in
d
er
assembl1'
am.
pull
horizontal.l7 at
right angles to
the
stop lever. It should require
3/4
to
1-1/4
ozs.
to start
the
laver
moving.
REPLACE
THE RANGE FIND!R .ASSEMBLY, TAKING CARE TO
AVOID
JAIOLING THE
TRIP LATCH
PLUNGER
AGAINST TH
E
ARMATURE TRIP-OFF SCREW WHm RDIOUH'l'IHG
(See
Figure
49)
*
*
*
(A)
'l'h.ese requiranenta should be checked with the range finder asseJIIb.q
ranaved.
(J")
-J
N
J::a
(J")
N
