Lukas CU 4DVV - Manual (Page 12)

12
Controlling double-acting hydraulic equipment
The double-acting hydraulic equipment is actuated by 4 or 8 (on the CU 4DW) control
levers on the drive side. The CU 4DW control table corresponds to two CU 2DV control
units mounted on a larger control table. Operating the CU 4DW control table is analogue to
that of the CU 2DV.
On the operator side , on the left, there are two smaller valve switching levers next to the
control levers (the black and red control lever ends), that are for de-pressurising before
uncoupling the anchor cylinder (control lever with red lever end) and the traversing
cylinder. Lifting cylinders can also be connected here if a DUO movement cylinder is not
used, or if one will only be used at a later time.
Proceed as follows if there is system pressure on the right-hand side and the connection
hoses cannot be coupled:
1. Connect the power pack,
2. create readiness for operation of the power pack (depends on the type)
3. Move the switching levers for pressurisation on the right-hand side to the pressure
position,
4. Set both control levers to lowering/retraction for three seconds (see illustration below)
This depressurises the system on the right on the operator side and the hoses can then be
coupled.
Pressure, or residual pressure in the supply circuit on the right of the control desk can be
created by actuating the <Lifting/Extending> control lever without connected end units. The
<Lifting/Extending> function contains the hydraulic load-holding function in order to hold the
load in its position by the system pressure. The pressure dissipates when moving downwards.