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44
Maintenance
PowlVac 38™ ARM 3000A Series 4
Vacuum Circuit Breaker
01.4IB.65131
3) Closing Spring Removal
The closing spring must be removed
in order to perform slow closing of
mechanism.
Although main closing spring removal is
not necessary for lubrication, it may be
necessary for performing adjustments
or major overhaul tasks. Furthermore,
removal of the main closing spring permits
slow closing of the mechanism and the
vacuum interrupter contacts. For details,
Ch 5 Maintenance, B. Mechanism Area,
Figure 15 Main Closing Spring Assembly
Compressed for Removal
a
c
b
d
e
a. Bolt
b. Flat Washer
c. Bracket
d. Spacer
e. Connecting Rod
Figure 16 Main Closing Spring Assembly
Installed
a
b
d
c
e
a. Bracket
b. Bolt
c. Lock Washer
d. Flat Washer
e. Spacer
The procedure for spring removal is as
follows:
1. With the main closing spring discharged
and the circuit breaker contacts open,
remove the screw at the top of the
spring rod together with the flat washer,
and lock washer.
2. Remove the horizontal bracket at the
top of the main closing spring, by
unfastening the two attachment screws.
3. Remove the spacer from below the
bracket.
4. Turn the bracket 90˚, and replace it on
the top of the spring yoke.
5. Place the spacer above the bracket with
the flat washer below it.
6. Insert screw and tighten until the
tension is taken off the connecting rods.
