GE AM-4.16-250-9 - REPAIR AND REPLACEMENT

r
GEK
-
41902
Magne
-
blast
Circuit
Breaker
D
.
Every
20
,
000
operations
or
Approximately
Every
Five
Years
-
Whichever
comes
first
:
1
.
The
breaker
should
be
given
a
general
inspection
and
overhaul
as
required
,
,
All
excessively
worn
parts
in
both
the
mechanism
and
breaker
should
be
re
-
placed
.
Such
wear
will
usually
be
indicated
when
the
breaker
cannot
be
adjusted
to
indicated
tolerances
.
This
overhaul
and
inspection
is
more
detail
-
ed
and
will
require
disassembly
of
mech
-
anism
and
breaker
operating
parts
.
2
.
All
roller
and
needle
bearings
in
die
operating
mechanism
should
be
dis
-
assembled
,
cleaned
,
and
repacked
with
G
.
E
.
lubricant
D
50
H
15
as
described
under
LUBRICATION
.
Remove
the
side
brace
(
5
)
,
and
pole
pieces
(
3
&
6
)
.
2
.
3
.
To
remove
the
upper
arc
runner
assem
-
bly
(
4
)
Figure
20
,
remove
assembly
bolt
(
1
)
Figure
18
.
Remove
the
assembly
bolts
(
15
)
Figure
18
to
remove
the
lower
brace
(
8
)
.
4
.
Remove
the
lower
interrupter
support
(
13
)
by
removing
the
assembly
bolts
(
14
)
and
the
connection
nut
(
8
)
Figure
20
.
5
.
0
}
At
this
point
,
the
throat
shields
(
5
)
Figure
20
,
and
the
lower
arc
runner
assembly
(
6
)
can
be
removed
.
6
.
The
stationary
primary
contact
fingers
(
3
)
Figure
23
,
should
be
disassembled
and
the
silver
-
plated
pivot
area
of
the
contact
and
contact
support
cleaned
lubricated
with
G
-
E
lubricant
3
.
Further
disassembly
of
both
the
upper
and
lower
arc
runner
assemblies
can
be
done
by
removing
the
various
screws
and
assem
-
bly
bolts
(
not
illustrated
)
as
shown
in
Figure
19
.
The
arc
chute
sides
(
6
)
Figure
19
,
can
also
be
separated
for
inspection
after
removing
assembly
bolts
(
2
&
4
)
Figure
7
.
and
D
50
H
47
.
8
.
The
breaker
and
operating
mechanism
should
be
serviced
as
described
for
every
2
,
000
operations
and
properly
adjusted
before
being
put
back
into
service
.
4
.
18
.
Reassemble
the
interrupter
in
the
reverse
order
.
The
following
items
should
be
noted
during
re
-
assembly
:
REPAIR
AND
REPLACEMENT
1
.
The
fins
of
the
arc
chute
sides
should
be
equally
spaced
and
aligned
before
bolting
together
.
The
front
edge
(
along
the
runner
)
of
the
two
arc
chute
sides
should
be
parallel
and
in
line
.
This
section
covers
the
proper
method
of
removing
and
replacing
those
parts
of
the
breaker
subject
to
damage
and
wear
that
may
require
repair
or
replacement
at
the
installation
.
IMPORTANT
:
UPON
COMPLETION
OF
ANY
REPAIR
WORK
,
ALL
BREAKER
AND
MECHANISM
ADJUSTMENTS
MUST
BE
.
CHECKED
.
STALLATION
,
paying
particular
attention
to
AD
-
JUSTMENTS
and
FINAL
INSPECTION
.
;
•
2
.
The
gap
between
the
fins
at
the
rear
of
the
arc
chute
sides
measured
at
least
1
"
in
from
the
back
end
of
the
arc
chute
(
See
Figure
21
)
should
be
1
/
64
"
to
3
/
32
"
.
3
.
Check
to
insure
that
electrical
connections
to
the
blowout
coils
are
tight
.
4
.
When
reassembling
the
arc
runner
as
-
semblies
,
check
that
the
spacers
are
cor
-
rectly
installed
.
5
.
Before
bolting
the
upper
supports
in
place
,
make
certain
that
the
upper
arc
runner
assembly
is
tight
against
the
arc
chute
side
so
that
the
gap
between
the
throat
insulation
(
7
)
Figure
19
,
and
the
arc
chute
sides
(
6
)
is
a
minimum
.
6
.
Make
certain
that
the
electrical
connections
(
2
&
8
)
Figure
20
are
tight
.
Reassemble
the
arc
chute
on
the
breaker
as
described
under
INTERRUPTER
REMOVAL
AND
REPLACEMENT
,
page
16
.
Refer
to
the
section
on
IN
-
I
-
ARC
CHUTE
(
To
inspect
or
replace
blow
-
out
coils
and
arc
runners
)
:
With
the
breaker
open
and
the
closing
springs
in
the
blocked
position
,
remove
the
box
barriers
(
7
)
Figure
8
.
The
interrupter
can
now
be
re
-
moved
as
described
under
INTERRUPTER
RE
-
MOVAL
AND
REPLACEMENT
page
16
.
To
disassemble
the
interrupter
after
it
has
been
removed
from
the
breaker
,
proceed
as
:
follows
:
NOTE
:
When
disassembling
the
arc
chute
and
its
components
some
small
washers
,
spacers
,
etc
.
,
will
be
found
that
cannot
be
identified
in
these
instructions
.
Care
should
be
taken
to
coUect
and
identify
these
items
so
they
can
be
reassembled
correctly
.
1
.
Remove
the
assembly
bolts
(
7
,
9
,
11
,
&
13
)
Figure
18
.
I
I
!
:
ti
1
I
1
/
j
U
}
11
20
h
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