Lukas PO-4 - Manual (Page 5)

5
6.1.2.2 Connection
Remove the locking cap at connection A of the valve block (13) and screw in hose connection
nipple. Connect pipe or hose to cylinder (see fig. 10).
Remark
Hose nipples and hoses are not part of the power pack's scope of supply and can be obtained from
LUKAS.
6.1.2 Power pack type PO4-4-N3-500 and PO4-4-N3-700 (see function diagram)
The version N3 includes a 3/3-way valve.
6.1.2.1 Operation (see fig. 2)
In position I (A) the cylinder extends when the pump is
switched on.
In position 0 (centre position of the operating lever) pressure
maintaining function at oil flow from P ---> T.
In position II the piston side of the cylinder is connected to
the oil tank and the cylinder is retracted by means of a return
spring.
Remark
The power pack has the same function as under 6.1.1.1
except that valve position 0 enables the pressure maintaining
function also when the motor is running.
PON4.Tif
fig. 2
6.2 Double-acting cylinders (see function diagram)
6.2.1.1 Operation (see fig. 2).
Type N4 is equipped with a 4/3-way control valve allowing
the control of double-acting cylinders.
The valve can be switched from the extended or the
retracted position into the neutral position without pressure
losses in the cylinder (positive overlap in the valve).
Each cylinder movement can be controlled by the 4/3-way
valve.
Position I (A) Extended position.
Position 0 (Centre position of the oper. lever).
Press. maintain. function at oil flow from P-->T.
Position II (B) The cylinder is hydraulically retracted.
PON4.Tif
fig. 2
6.2.1 Power pack type PO4-4-N4-500 and PO4-4-N4-700
6.2.1.2 Connection
Remove the locking cap in A and B of the valve block (13) and screw in hose connection nipple.
Connect pipe or hose to cylinder (see fig. 10).
Remark
Hose nipples and hoses are not part of the power pack's scope of supply and can be obtained from
LUKAS.