Lukas P 640 TG - Manual (Page 37)

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7. Clean the fastening point and the connection nipple for the piping using a non-fibrous
cloth.
8. Screw the connection nipple for the piping and the return pipe into the valve block and
tighten.
9. Apply seal using sealant.
10. Place a new seal on the fastening point and bolt the new valve block to the unit once
again.
Please consult the spare parts lists for the necessary torques. If no torques are specified,
the screws are to be tightened in such a way that no leakage and overload of the screwed
connections can occur.
11. Reassemble the hydraulic fluid reservoir. (If necessary, replace the reservoir seal).
Please consult the spare parts lists for the necessary torques.
12. Vent the unit once the repairs are complete.
Replacing the valve blocks of the 620 units:
1. Disconnect all hoses from the valve block.
2. Loosen the fastening screw of the valve block.
CAUTION! Do not loosen the fastening screw of
the connection flange!
3. Remove the valve block.
4. Position the new O-rings at the correct points of the
connection flange.
Observe the relevant spare parts list.