1ZSE 5492-124 en, Rev. 6 | Maintenance guide UCG 29
4.1 Dismantling the boards
Dismantle the boards from the frame by removing the six
screws and the locking washers from each board (Fig. 16).
Punch the guide pins with a 4 mm mandrel. Note that the
guide pins are placed high on one board and low on the other
board in order to make the boards non-reversible.
When mounting, use new locking washers and guide pins.
Lift away the boards in the lifting eye, see Fig. 7 with fixed
contacts and transition resistors from the contact-mechanism
(Fig. 17). The boards, which are made of insulating material,
shall be wiped with rags.
Locking
washer
Guide
pin
Screw
Board
Fig. 16. Contact replacement, dismantling the boards.
4.2 Dismantling the moving main contacts
Dismantle the moving main contacts according to Figs.18
and 19. Take away split pins, washers and springs in both
ends of shafts 1–3. There is one shaft for each pair of
contacts.
Notice that the outer end of the outer phase have
washers with a larger diameter, see Fig. 18.
Do the same for the contacts on the opposite side.
Pull out shaft 1. Take care of the silver washers. Do the same
with shaft 3. Punch out the middle shaft 2 by means of a
5mm mandrel of brass. Shaft 2 must then be passed through
the holes for shafts 1 or 3 and remain there until new contacts
are mounted.
Repeat the procedure for the contacts on the opposite side.
Fig. 17. Contact replacement, boards lifted away.
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