Lukas P 640 TG - Manual (Page 36)

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CAUTION with (quick-disconnect-system)!
As the case may be, make sure that reservoir port 'T' or 'T1' of the unit is always
equipped with a female quick-disconnect coupling.
On the other hand, the supply ports must be equipped with a male quick-
disconnect coupling.
12.3.6 Replacing the valve blocks
Replace the valve blocks if they are leaky or defective and direct repair of the valve block by
a dealer or LUKAS is no longer possible. The valve block may only be replaced when the
hydraulic unit is switched off. Electric motors must be disconnected from the power supply.
Replacing the valve blocks of the 640 units:
1. Disconnect all hoses from the valve block.
2. Loosen the fastening screws of the hydraulic
fluid reservoir and remove the fluid filler
caps.
3. Remove the hydraulic fluid reservoir.
Please ensure that the hydraulic fluid does not
become contaminated, or replace the hydraulic fluid.
4. Loosen the union nut on the piping of the
valve block and the fastening screws of the
valve block.
5. Remove this and the seal underneath it.
6. Remove the connection nipple for the piping and the
return pipe from the valve block.