GE AK-50 Series - Page 19

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
3
.
Remove
the
closing
spring
assembly
by
removing
the
upper
and
lower
spring
pins
(
1
,
31
)
.
4
.
Remove
the
right
hand
bearing
side
plate
(
20
)
,
and
the
side
plate
shims
(
18
)
if
present
,
by
removing
four
mounting
bolts
(
19
)
,
thus
allowing
the
main
closing
crank
(
25
)
to
be
removed
.
5
.
Remove
the
closing
handle
(
22
)
by
removing
two
set
screws
threaded
in
same
hole
.
imum
distance
from
the
center
of
rotation
of
the
ratchet
wheel
(
17
)
.
This
measurement
should
be
made
while
operating
the
closing
handle
during
the
four
spring
charging
operations
and
before
the
closing
springs
are
reassembled
.
3
.
The
ratchet
pawls
(
21
)
should
operate
They
freely
throughout
the
closing
strokes
,
should
engage
the
ratchet
wheel
teeth
near
the
end
of
each
counterclockwise
and
clockwise
stroke
of
the
closing
handle
with
a
definite
clicking
sound
,
indicating
a
free
non
-
binding
operation
,
the
clicking
sound
is
detected
,
the
closing
handle
should
have
a
minimum
overtravel
of
1
/
2
in
.
or
3
1
/
2
degrees
,
measured
at
the
end
of
each
handle
stroke
.
6
.
Remove
the
front
escutcheon
by
removing
four
screws
holding
it
to
the
front
frame
center
support
.
7
.
Remove
the
handle
return
spring
(
29
)
by
unhooking
either
end
of
the
spring
.
8
.
Disconnect
the
top
end
of
each
pawl
spring
After
4
.
The
groove
pin
(
14
)
in
the
front
of
the
ratchet
wheel
assembly
(
16
)
must
be
assembled
in
a
manner
that
will
allow
Nylok
screw
(
15
)
to
be
tightened
securely
.
A
clearance
of
1
/
64
to
1
/
32
in
.
should
exist
between
the
front
of
the
groove
pin
and
the
rear
surface
of
the
Nylok
screw
head
.
Other
adjustments
to
the
closing
and
operating
mechanisms
,
such
as
complete
contact
and
latch
adjustments
,
may
be
made
by
following
the
pre
-
viously
described
instructions
for
the
AK
-
50
,
-
75
and
-
100
breaker
mechanisms
.
(
7
)
.
pin
(
24
)
,
thus
allowing
(
23
)
and
pawl
assembly
9
.
Remove
the
roll
the
closing
handle
shaft
(
23
)
to
be
removed
.
10
.
Remove
the
ratchet
wheel
(
17
)
and
its
assembly
(
16
)
by
removing
Nylok
*
screw
(
15
)
and
thrust
bearing
(
12
)
.
If
shims
(
13
)
are
present
they
must
also
be
removed
.
11
.
Remove
front
bearing
plate
(
9
)
by
removing
three
mounting
bolts
(
10
)
accessible
from
the
front
of
the
breaker
.
The
mechanism
is
now
completely
disassembled
,
of
the
subassemblies
removed
during
the
above
operation
be
further
disassembled
in
the
field
.
Replacement
sub
-
assemblies
should
be
obtained
from
the
factory
.
12
.
To
reassemble
the
mechanism
,
reverse
the
procedure
described
above
.
NOTE
:
When
reassembling
the
mechanism
the
adjustments
listed
below
should
be
checked
at
the
appropriate
time
of
reassembly
,
appropriate
time
for
each
adjustment
is
in
-
dicated
in
the
adjustment
text
.
Adjustments
(
Fig
.
15
)
It
is
not
recommended
that
any
i
)
FIELD
SWITCH
FIELD
DISCHARGE
CONTACTS
DISCHARGE
RESISTOR
r
\
The
FIELD
WINDING
wvwvw
Frequent
adjustments
to
the
mechanism
should
If
the
mechanism
has
been
not
be
required
,
disassembled
,
it
will
be
necessary
to
check
the
following
adjustments
:
Fig
.
16
(
415
A
845
)
Typical
connection
diagram
AKF
MECHANISM
(
Fig
.
17
)
The
Type
AKF
breakers
are
two
-
pole
breakers
with
field
discharge
contacts
placed
in
the
center
pole
.
When
this
breaker
is
opened
,
the
field
discharge
contacts
close
,
thus
connecting
an
ex
-
ternal
discharge
resistor
across
the
field
of
the
generator
or
motor
.
When
the
breaker
is
closed
,
the
field
discharge
contacts
are
opened
.
See
Fig
.
16
for
a
typical
circuit
connection
.
1
.
It
may
be
necessary
to
add
shims
(
13
)
to
reduce
the
end
play
of
the
ratchet
wheel
shaft
(
16
)
.
An
end
play
of
0.010
to
0.020
of
an
inch
is
recommended
.
Shims
should
be
obtained
from
the
factory
.
2
.
It
may
be
necessary
to
add
buffer
stop
shims
(
27
)
to
the
buffer
stop
(
26
)
to
provide
a
clearance
of
1
/
64
to
1
/
32
inch
between
the
pawls
(
21
)
and
the
buffer
stop
,
when
the
pawls
are
touching
the
ratchet
wheel
teeth
extending
a
max
-
*
Trade
-
mark
of
Republic
Steel
Corp
.
19
Courtesy of NationalSwitchgear.com