GE POWER/VAC GEK 86132A - Page 17

16
.
MECHANICAL
ADJUSTMENTS
16.1
.
GENERAL
The
ML
-
18
Mechanism
has
been
designed
for
extended
intervals
between
maintenance
.
In
most
cases
only
the
wipe
and
gap
adjustments
will
require
re
-
setting
throughout
the
life
of
the
circuit
breaker
.
14
,
9
.
MOTOR
REPLACEMENT
With
the
breaker
open
and
the
closing
spring
discharged
,
remove
auxiliary
switch
as
described
above
but
do
not
disconnect
leads
.
Move
switch
toward
side
of
mechanism
far
enough
to
clear
motor
and
tie
there
temporarily
,
Disconnect
motor
leads
and
remove
the
“
C
"
ring
retaining
the
charge
linkage
arms
to
the
motor
output
shaft
.
Remove
the
long
bolt
and
spacer
securing
the
motor
to
the
mechanism
mid
-
plate
.
Remove
the
two
socket
head
cap
screws
securing
the
motor
to
the
mechanism
top
plate
,
Disengage
the
motor
output
shaft
from
the
charge
linkage
arms
and
withdraw
motor
.
To
install
the
new
motor
,
reverse
the
above
procedure
.
14.10
.
“
Y
”
RELAY
REPLACEMENT
Before
removing
the
“
Y
”
relay
,
make
sure
all
leads
are
marked
with
terminal
locations
.
Next
,
disconnect
all
leads
and
remove
the
two
fasteners
securing
the
“
Y
”
relay
’
s
shock
absorbing
mounting
bracket
to
the
mechanism
rear
plate
.
Withdraw
relay
and
bracket
.
Remove
fasteners
securing
relay
to
mounting
bracket
.
Reverse
above
procedure
to
install
new
relay
.
15
.
RENEWAL
PARTS
It
is
recommended
that
sufficient
renewal
parts
be
carried
in
stock
to
enable
the
prompt
replacement
of
any
worn
,
broken
or
damaged
parts
.
A
stock
of
such
parts
minimizes
service
interruptions
caused
by
breakdowns
,
and
saves
time
and
expense
.
When
continuous
operation
is
a
primary
consid
-
eration
,
more
renewal
parts
should
be
carried
,
the
amount
depending
upon
the
severity
of
the
service
and
the
time
required
to
secure
replacements
.
Renewal
parts
which
are
furnished
may
not
be
identical
to
the
original
parts
,
but
they
will
be
interchangeable
.
A
separate
Renewal
Parts
Bulletin
is
available
from
your
local
GE
Sales
office
by
asking
for
GEK
90218
.
15.1
.
ORDERING
'
INSTRUCTIONS
1
.
Always
specify
the
complete
nameplate
data
of
both
the
breaker
and
the
mechanism
.
2
.
Specify
the
quantity
,
catalog
number
(
if
listed
)
,
reference
number
(
if
listed
)
,
and
description
of
each
part
ordered
,
and
the
parts
bulletin
number
.
3
.
Standard
hardware
,
such
as
screws
,
bolts
,
nuts
,
washers
,
etc
.
is
not
listed
in
this
bulletin
.
Such
items
should
be
purchased
locally
.
4
.
For
prices
or
information
on
parts
not
listed
in
the
Renewal
Parts
Bulletin
,
refer
to
the
nearest
GE
office
,
:
16.2
.
WIPE
ADJUSTMENT
Wipe
is
the
additional
compression
of
a
preloaded
spring
,
used
to
apply
force
to
the
vacuum
interrupter
contacts
and
to
provide
opening
kick
-
off
force
.
An
indicator
is
provided
on
the
wipe
spring
assembly
with
graduations
given
in
0.050
inch
on
which
the
wipe
is
indicated
directly
.
See
Figure
8
.
Improvement
in
the
accuracy
of
the
wipe
measurement
may
be
obtained
by
using
a
feeler
gauge
between
the
top
of
the
wipe
indicator
and
the
erosion
disk
.
The
difference
in
readings
recorded
on
each
pole
with
the
breaker
closed
and
open
will
be
the
contact
wipe
.
After
adjustment
the
wipe
should
be
0.155
-
0.180
inch
.
To
adjust
the
primary
contact
wipe
,
close
the
breaker
and
proceed
as
follows
:
1
.
Loosen
but
do
not
remove
the
two
screws
(
9
,
Fig
.
8
)
holding
the
interrupter
clamp
.
2
.
Check
that
the
interrupter
clamp
is
loose
,
A
light
pry
at
the
clamp
half
-
junction
may
be
required
to
loosen
the
wedging
action
of
the
clamp
.
:
.
,
t
3
.
Hold
the
hexagon
projection
(
6
,
Flg
.
8
)
at
the
bottom
of
the
operating
rod
insulator
(
1
inch
wrench
)
and
loosen
the
adjacent
locknut
(
3
/
4
inch
wrench
)
.
Refer
to
(
4
,
Fig
.
8
)
,
Adjust
by
rotating
the
operating
rod
insulator
.
The
thread
is
1
/
<
2
*
13
and
each
turn
will
give
about
0
,
078
inch
change
in
prittfary
wipe
.
Screw
the
operating
rod
insulator
toward
the
inter
-
rupter
to
increase
wipe
.
4
.
After
setting
the
contact
wipes
on
each
phase
,
torque
the
operating
rod
locknut
(
9
,
Fig
.
8
)
to
40
-
50
foot
pounds
while
preventing
the
operating
rod
insulator
(
7
)
from
turning
.
Tighten
the
clamp
screws
(
6
)
to
8
-
10
foot
pounds
and
trip
the
breaker
open
.
This
procedure
prevents
accidental
twisting
of
the
interrupter
’
s
operating
rod
by
loading
the
contaOts
with
the
wipe
springs
and
forcing
relative
rotation
to
occur
at
the
clamp
interface
.
After
adjustment
,
remeasure
the
wipe
dimensions
,
If
the
wipe
settings
are
within
the
required
limits
,
there
is
an
adequate
contact
closing
relationship
between
the
poles
.
13
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