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37
IB-65100
Maintenance
Figure 18
Main Closing Spring Assembly
Compressed for Removal
Figure 19
Main Closing Spring Assembly
Installed
a
a
d
c
b
b
a. Connecting
Rod
b. Flat
Washer
c. Bracket
d. Bolt
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,
see
Ch 5 Maintenance,
B. M
ECHANISM
A
REA
,
4)
Slow Closing of Mechanism
.
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.
7. With a slight rocking motion of the
main closing spring assembly, the
connecting rods (Figure 18, a) can now
be unhooked from the spring yoke pins
and the main closing spring assembly
can be removed.
Note:
Care should be taken on reassembly
to ensure correct location of the flat
washer, lock washer and spacer
(Figure 19).
a. Spacer
b. Flat
Washer
c. Lock
Washer
d. Bolt
e. Bracket
a
b
c
d
e
c
e
