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Recommended Renewal Parts and Replacement Procedures
PowlVac
®
STD Vacuum Circuit Breaker
IB-60201
Figure 30 Lower Contact Block Setting
q. Remove the nut from the bell crank
mounting bolt and remove the bell
cranks (Figure 31).
r. Reinstall the operating yoke to the
lower end of the vacuum interrupter.
s. Insert the pin through the operating
yoke and the lower primary
disconnecting devices.
Figure 31 Bell Crank Removal
t. Set the height of the operating yoke
by using gauge 100B774. With the
long arm of the gauge against the
lower surface of the upper primary
disconnecting devices, the lower
surface of the pin should touch the step
of the gauge. Alternate the gauge from
side to side while adjusting the height
of the operating yoke in increments of
½ turn to achieve best fit (Figure 32).
u. Remove the pin and reassemble the bell
cranks.
Figure 32 Operating Yoke Setting
v. Lubricate the pin with a liberal coat of
Rheolube 368A. Insert the pin through
both the bell cranks and the operating
yoke, and place a new X-washer in
the groove of the pin. Tighten the
X-washer by squeezing the two open
ends together with pliers. It may
be necessary to align the operating
yoke and bell crank holes to allow pin
insertion. This can be accomplished
by applying a downward force to the
lower contact block just sufficient to
overcome the force of the vacuum.
CAUTION
CAUTION
!
Do not force the lower contact block down
farther than required to align the pin, bell
cranks, and operating yoke as damage to
the vacuum interrupter bellows and loss of
vacuum may result.
