– The screws and nuts are tightened in the factory and
correct tightening is marked with a collared sign. No further
tightening operations are foreseen during the operating life
of the circuit-breaker.
However, following any maintenance interventions, should
it be necessary to re-tighten the screws or nuts, it is
recommended to always replace the screws and nuts and
to keep to the values indicated in fig. 11.
– Check the main actuator lever roller bearing lubrication (see
details A of fig. 12): it is advisable to lubricate with a few
drops of SAE 80W/90 type oil, using a special oiler.
Proceed as follows:
– remove the circuit-breaker screen
– charge the operating mechanism spring and lubricate the
right-hand bearing (circuit-breaker seen from the front - see
fig. 12)
– close the circuit-breaker and lubricate the left-hand bearing
(circuit-breaker seen from the front- see fig. 12).
Fig. 11
15 Nm
25 Nm
10 Nm
10 Nm
25 Nm
12 Nm
7
Checking tightness of the screws
23
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