Siemens GMI Series

Overhaul
Note
:
The
VS
10028
tube
will
not
require
a
spacer
.
15.5
Having
determined
the
required
number
of
washers
,
insert
hex bolt
through
lockwasher
,
trunnion
,
spacer
and
shim washers
.
Engage
bolt
into
the
vacuum
tube
stem
and
tighten
by
hand
to
snugness
.
Engage
trunnion
to
bell crank
(
both sides
)
and
tighten
hex bolt
further
until
lockwasher is
just
collapsed
.
15.6
Manually
exercise
bell
cranks
,
opening
tube
approxi
-
mately
1
/
4
to
3
/
8
of
an
inch
.
Release bell cranks
,
tube
should
snap
freely
to
the closed
position
.
The
main
contacts
should be
clearly
heard
as
they
meet
upon
closing
.
Check
to
make certain the
insulating centering
blocks
or
rings
at
the base
of
the tube
are
loose
to
permit
tube
alignment
.
It
may
be
necessary
to
repeatedly
free
the
tube
'
s
stationary
fastener
,
shift
the
tube
slightly
,
retighten
and recheck bell crank
snap
action
closing
until
full
movable
contact
freedom
is assured
.
15.7
Once
free
movement
of
the movable
contact
is achieved
,
the tube
centering
blocks
or
ring
may
be
fastened
.
Select
two
X
-
washers
from
parts
kit
and
crimp
into
grooves
at
each end
of
the trunnion
16
.
Open
Stroke
Adjustment
The
open
position
is
established
by
the
insulating
coupler
which when
adjusted
to
the
proper
length
,
and
attached
to
the bell
cranks
,
will
hold
the tube
open
at
the
proper
contact
gap
or
separation
.
In
Article
15
,
the trunnion
shaft
center
was
set at
one
half
the
required
vacuum
tube
stroke above
the
bell crank
shaft
horizontal
centerline
.
The
open
position
will
be
established
with
the trunnion
shaft
center
one
half
the
required
vacuum
tube
stroke
below the
bell
crankshaft
horizontal
centerline
.
The
adjustment
requires
the
insulating
pushrod
length
be
varied
by
turning
the threaded
pushrod
end
into
or
out
of
the
pin
coupling
the
pushrod
to
the breaker
jack
shaft
Required
trunnion
center
below bell crank
shaft
center
:
3
mm
4
mm
5.5
mm
4
mm
Engage
pushrod
to
bell cranks and
gage
trunnion
shaft
center
distance below
bell
crank
shaft
center
.
If
less than
required
,
the
pushrod
must
be shortened
,
screwed
into
the
jackshaft
pin
.
If
greater
than
required
,
the
pushrod
must
be
lengthened
by
screwing
it
out
of
the
jackshaft
pin
.
By
interactively
engaging
the trunnion
shaft
center
,
discon
-
necting
the
coupler
,
adjusting
the
coupler
,
reattaching
the
coupler
to
the bell cranks
,
and
again
gaging
the trunnion
center
,
the
required
trunnion
center
position
relative
to
the
bell crank
shaft
center
will
be achieved
.
The
gage
block
(
18
-
750
-
171
-
001
,
-
002
,
or
-
003
as
appropri
-
ate
)
,
when
held
firmly
on
the
trunnion
will
just
contact
the
lower
surface of
the bell crank
shaft
at
the
correct
open
position
(
Figure
52
)
.
Note
:
Stationary
contact
is annealed
copper
.
Thread
damage
will
occur
if
threads
are
crossed
.
Be
sure
the
bolt
can
be
fully
engaged
with
light
manua
torque
.
Fasten the
insulating
support
plate
to
the
upper
primary
stab
support
.
Use
four
hex socket
flat
head
screws
.
Clean
external
and
internal
threads
.
Apply
"
Loctite
"
Primer
T
to
the external and
internal threads
.
Apply
"
Loctite
"
threadlocker
262
to
the external
threads
.
En
-
gage
and
torque
8
-
10
ft
-
lbs
.
15
.
Trunnion and Movable
Contact
Adjustment
15.1
The trunnion is
fitted
to
the tube
'
s
movable
stem
in
concert
with
spacer
and shim washers
.
A
special
tool
consisting
of
a
threaded
shaft
and
gage
block
is
to
be
used
to
determine
the
correct
number
of
shimming
washers
.
Gaging
tool
consists
of
:
Note
:
VS
10028
Interrupter
will
not
require
a
spacer
.
Threaded
Shaft
M
12
Threaded
Shaft
M
10
Gage
Block
6
mm
:
Gage
Block
8
mm
:
Gage
Block
11
mm
:
VS
12015
requires
6
mm
gage
and stroke
.
VS
25002
requires
8
mm
gage
and stroke
.
VS
10028
requires
8
mm
gage
and
stroke
.
VS
10006
requires
11
mm
gage
and stroke
.
The
gage
will
set
the trunnion
center
at
one
half
the stroke
magnitude
above the
center
of
the bell cranks
major
pivot
.
The
gage
block
includes
allowances
for
trunnion
thickness
,
1
/
2
the stroke and radius
of
the
major
bell
crank
pivot
(
Figure
52
)
.
15.2
Torque
fastener
at
the
tube
'
s
stationary
contact
to
firm
the
tube
stationary
contact
against
the
primary
exten
-
sions
,
using
torque
shown
in
Table
7
.
The
companion
lock washer is
to
be
fully
collapsed
.
Hold tube
in
the
alignment
required
under Article
12
of
the
vacuum
tube
replacement procedure
while
tightening
this
fastener
.
15.3
Thread
gaging
shaft
,
by
hand
,
into
movable
stem
of
the
vacuum
tube
.
M
10
th
read
for VS
12015
and
VS
25002
.
M
12
thread
for
VS
10006
and
VS
10028
.
Thread
by
hand until
fully
and
firmly
seated
.
15.4
Apply
shim washers
,
approximately
7
,
spacer
and
cor
-
rect
gage
block
over
the
shaft
.
Raise
the
gage
block
until
the
gage
foot
just
bears
or
comes
within
one
washer
thickness
of
bearing
upon
the lower
surface of
the bell
crank
shaft
.
Washers
may
have
to
be removed
or
added
to
achieve
these conditions
.
The
spacer
and washers
above the
gage
block
must
be
packed
against
the
vacuum
interrupter
movable
stem
when observation
of
the
gage
foot
to
bell
crank
clearance is made
.
The
gage
foot
must
just
touch the
shaft
or
be
within
one
shim
washer thickness
of
doing
so
.
18
-
658
-
137
-
105
18
-
658
-
137
-
102
18
-
750
-
171
-
001
18
-
750
-
171
-
002
18
-
750
-
171
-
003
VS
12015
VS
25002
VS
10006
VS
10028
(
0.118
in
)
(
0.157
in
)
(
0.217
in
)
(
0.157
in
)
33
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