Lukas Compact Units - Manual (Page 24)

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7. When you refit the reservoir, exchange the reservoir seal and fasten the securing bolts
(for tightening torque, see spare parts list).
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8. Also replace the seal ring of the drain plug and fit it as specified in the spare parts list.
9. Add the new hydraulic fluid to the reservoir through the filling plug.
10. Finally, the unit must be vented as described in the chapter entitled "Start-up"
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