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User’s guide VUBB
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1ZSC000562-AAL en
If oil leakage remains, the O-ring must be replaced:
3. Lower the oil level in the tap-changer by 100-150 mm.
4. Remove the bolts and washers from the top cover. See
Fig. 66.
CAUTION
Be careful not to drop any screws or other items into
the tap-changer.
Place all removed items in a box to prevent them from
falling into the tap-changer.
5. Carefully lift the cover at least 10 cm straight up before
moving it horizontally. See Fig. 67.
Be sure not to damage the bevel gear and the pipe
when lifting.
6. Replace the O-ring with a new one. See Fig. 68.
8. Refit the M12 bolts and washers to the top cover. See Fig.
66.
9. Tighten the bolts. Tightening torque 84 ±10 %.
10. Refill the oil; see Section 3.5.
If there is still oil leakage, check if the leakage is between
the bevel gear flange and the tap-changer. Follow the this
procedure:
If the leakage is in the gear box (from the tap-
changer into the gear box), contact ABB for further
instructions.
11. Be sure that the oil level in the tap-changer is lowered by
100-150 mm.
12. Loosen the hose clip on the protective tube at the bevel
gear. See Fig. 70.
7. Carefully refit the cover. Be sure to lower the cover straight
down the last 10 centimeters above the upper flange. See
Fig. 69.
Fig. 67. Procedure for lifting the cover.
Fig. 69. Procedure for lowering the cover.
Fig. 68. Replace the O-ring.
10 cm
10 cm
