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47
Recommended Renewal Parts and Replacement Procedures
01.4IB.50032C
c. Measure and record the height of the
opening springs.
d. Relieve the tension on the opening
springs by removing the locknuts
and the hex nuts found on top of
the opening springs. During this
operation hold the circuit breaker open
by inserting a large screwdriver or a
similar tool under the pin connecting
the opening spring rod to the jackshaft
levers and over the spacer that contacts
the open position stop bolt, then
apply pressure upward. The jackshaft
will rotate to the vacuum interrupter
“contact touch” position when the
tension is relieved from the opening
springs and the pressure on the tool
holding the circuit breaker open is
relaxed (Figure 16).
Figure 16 Tension Relieved on Opening Springs
e. If present, loosen the set screw holding
the operating yoke to the operating pin.
Remove the X-washer from one end of
the vacuum interrupter operating pin
and remove the pin (Figure 17). The
X-washer can be opened by squeezing
the two projecting tabs with pliers.
Discard the X-washer after removal.
Figure 17 Operating Pin Removal
f. Remove the four socket head screws,
two on each side which holds the
sliding contact finger assemblies
downward.
g. Unscrew and remove the operating
yoke at the lower end of the vacuum
interrupter.
h. Loosen, but do not remove the two
bolts through the upper contact block.
i. Loosen, but do not remove the four
bolts connecting the vertical connector
bars above the vacuum interrupter
to the upper primary disconnecting
devices.
j. While supporting the vacuum
interrupter, remove the two bolts
connecting the upper contact block to
the vertical connector bars.
Note:
Depending upon the rating of the
vacuum interrupter to be replaced,
it may be necessary to remove the
vertical connector bars from one side
of the assembly to gain adequate
clearance for removal of the vacuum
interrupter assembly.
