SECTION 5 - HYDRAULICS
3121784
5-13
Depending on the movement required, proportional valve will open accordingly regulating the proper oil rate, than the
relevant ON-OFF valves (one each movement) will open addressing the oil to the relevant cylinder or actuator.
When the proportional valve coil is not fed, oil is sent to the drainage and then to the tank.
The maximum pressure valve has to be calibrated as indicated on use and maintenance manual at 200 bar with Diesel
engine or 180 bar with electric motor (185 bar for lithium machine).
On each cylinder an actuator is installed a couple of calibrated valves, one each direction, when movement is in progress
on one direction the opposite valve is piloted to open letting oil flow back to the manifold valve block.
When these valves are not piloted oil flow is avoided so that they keep the cylinder and actuator position against external
forces or in case of an hose damage.
Tower Boom
The tower boom is moved by one cylinder. This cylinder is equipped with an internal sensor that measures its opening
position.
Main Boom
The main boom is moved by one cylinder. This cylinder is equipped with an internal sensor that measures its opening posi-
tion.
Telescope
Telescope system is composed by two parts, the tower boom that contains the first telescope and the main boom that
contains the second telescope. They are all opened or closed together by an unique internal cylinder and a system of
ropes and pulleys.
Microswitches detect the ropes positions within the boom sections.
Jib
Jib is moved by one cylinder, while moving jib the platform is kept level thanks to the parallelogram system.
Platform Leveling
Platform levelling close circuit is composed by two cylinders, one on the platform and one on the jib. The platform is auto-
matically kept levelled while the boom is moving because of the platform cylinder is moved by connection rod cylinder.
In particular, while boom is opening, the connection rod cylinder will be closing so that its oil will be send to the platform
cylinder achieving the automatic basket levelling.
Platform Rotation
Platform rotation is carried out by the platform rotation actuator composed by two chambers, the maximum rotation pos-
sible is 62° on both directions achieving a total of 124°.
Two black arrows show the platform aligned position.
Turn Table Rotation
Turret rotation is carried out by a rotation hydraulic motor moved by a worm screw on a bearing ring.
Turret could be rotated 180° each side till a mechanical block, achieving a total rotation.
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