(j)
-.J
"'
.r:..
w
......
- 25-
(B-138)
adjusting wrench.
To do this, insert the adjusting wrench in the hole above
the end of the adjusting arm and rotate the wrench.
Tighten the bracket and
adjusting arm mounting screws.
SELEX::TOR MAGNET BRACKl!.'T ADJUSTMENT
(Figures
41 A
and
B)
See Note
(A)
NOTE:
When making this adjustment the selector arm should be kept in the
MARKING position.
With the selector.magnet energized, the clearance between the
selector arm operating sere\� and the se2ector ann should be
.004"
to
.00611
greater when the armature lever is on a
peak
of its cam than when the armature
lever is opposite an indent on the cam.
(A)
To adjust, de-energize the magnet and rotate the selector cam sleeve
m1til the armature lever is resting on a
peak
of the armature lever
cam. Holding the cam sleeve
in
this position, turn the main shaft
to a point where it moves the armat ure lever the greates t distance.
(B)
(C)
With
the selector magnet still de-energized, loosen the selector
magnet
bracket mounting screws and, by means of its adjusting screy;,
rotate the selector magnet bracket so that the annature just touches
the
pole-faces; then turn the adjusting screw an additional one
tenth of a turn counter-clockwise.
'!his will press the annature
firmly against the magnet cores.
(\'ihile making the one- tenth of
a
turn adjustment, be careful to avoid lost motion due
to
loose
fitting �crew threads.)
With the
selector magnet energized, measure the clearance
between
the selector
arm
operating screw and the selector arm and if
there
is no clearance, back off
the
selector
ann
o
pe
rat
in
g
screw to pro
vide at least
.00
6
11
c learance.
Then
rotate the
selector cam
sleeve
so that the armature lever is opposite an indent of its
cam
and
again
measure the clearance between the selector ann operating screw
and the selector
arm.
If the difference in the two c learances ex
ceeds
.00
6
11,
the
selector
magnet bracket adjusting sc rev1 should be
turned clockwise.
If the difference in the clearance is less than
.00411,
tum the sc rev. counterclockwise.
Tighten the selector magnet
bracket mounting screw s.
ARMATURE LEVER
SPRING TENSION ADJUsrMENT (Figure
41)
See Note
(A)
Unhook
the armature
l
ev
er spring from its s pring arm and
rotate the
main ehe.ft until the armature l ever is on a
high
part
of its
cam
.
W
i
t
h
a
32
oz. seale hooked in
its spring
eye,
pull
the spring to its positi on length.
It
should r
e
quire the foll�ng tensions:
(A)
I.f
a
distortion
test set is
available, the spring
tension should
be
set at the optimum value within the li.mi ts of
13
to
24
ozs.
*
*
*
(A)
'lhese requirements should be checked with the range finder assembly
removed.
