GE AM-4.16-250-6 - Repair and Replacement; Interrupters, Contacts, and Bushings

GEI
-
88761
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
the
operating
mechanism
should
be
dis
-
assembled
,
cleaned
,
and
repacked
with
G
.
E
.
lubricant
D
50
H
15
as
described
under
LUBRICATION
.
3
.
The
stationary
primary
contact
fingers
(
3
)
Figure
23
,
should
be
disassembled
and
the
silver
-
plated
pivot
area
of
the
contact
and
contact
support
cleaned
and
lubricated
with
G
-
E
lubricant
D
5
CH
47
.
4
.
The
breaker
and
operating
mechanism
should
be
serviced
as
described
for
every
2
,
000
operations
and
properly
adjusted
before
being
put
back
into
service
.
Remove
toe
side
brace
(
5
)
,
and
pole
pieces
(
3
&
6
)
.
To
remove
toe
upper
interrupter
support
(
10
)
remove
toe
assembly
bolt
(
1
)
,
and
toe
bolted
connection
(
2
)
Figure
20
be
-
tween
toe
upper
interrupter
support
and
toe
blowout
coil
.
Remove
toe
assembly
bolt
(
16
)
Figure
18
to
remove
toe
lower
brace
(
8
)
.
Remove
toe
lower
interrupter
support
(
14
)
by
removing
toe
assembly
bolts
(
15
)
and
toe
connection
nut
(
8
)
Figure
20
.
At
this
point
,
toe
side
shields
(
5
)
Figure
20
,
and
toe
arc
runner
assemblies
(
4
&
6
)
can
be
removed
.
2
.
3
.
4
.
5
.
6
.
7
.
Further
disassembly
of
both
toe
upper
and
lower
arc
runner
assemblies
can
be
done
by
removing
toe
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
8
.
18
.
Reassemble
toe
interrupter
in
toe
reverse
order
.
The
following
items
should
be
noted
during
re
-
assembly
:
REPAIR
AND
REPLACEMENT
This
section
covers
the
proper
method
of
removing
and
replacing
those
parts
of
toe
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
.
1
.
The
fins
of
toe
arc
chute
sides
should
be
equally
spaced
and
aligned
before
bolting
together
.
The
front
edge
(
along
the
runner
)
of
toe
two
arc
chute
sides
should
be
paraUel
and
in
line
.
2
.
The
gap
between
toe
fins
at
toe
rear
of
toe
arc
chute
sides
measured
at
least
1
"
inf
rom
toe
back
end
of
toe
arc
chute
(
See
Figure
21
)
should
be
1
/
64
"
to
3
/
32
"
.
3
.
Check
to
insure
that
electrical
connections
to
toe
blowout
coils
are
tight
.
4
.
When
reassembling
the
arc
runner
as
-
semblies
,
check
that
the
spacers
are
cor
-
rectly
installed
.
5
.
Before
bolting
toe
upper
supports
in
place
,
make
certain
that
the
upper
arc
runner
assembly
is
tight
against
toe
arc
chute
side
so
that
toe
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
toe
arc
chute
on
the
breaker
as
described
under
INTERRUPTER
REMOVAL
AND
REPLACEMENT
,
page
16
.
Refer
to
toe
section
on
IN
-
ARC
CHUTE
(
To
inspect
or
replace
blow
-
out
coils
and
arc
runners
)
:
With
toe
breaker
open
and
the
closing
springs
in
toe
blocked
position
,
remove
toe
box
barrier
(
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
foUows
:
NOTE
:
When
disassembling
toe
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
collect
and
identify
these
items
so
they
can
be
reassembled
correctly
.
1
.
Remove
the
caps
and
assembly
bolts
(
7
,
9
,
11
,
&
13
)
Figure
18
.
20
Courtesy of store.ips.us