SECTION 5 - HYDRAULICS
3121623
– JLG Lift –
5-13
Third Boom
Third boom is moved by one cylinder, this cylinder is equipped with an internal sensor that measures its opening position.
While lifting third boom, when it's going to reach its end of the stroke, in order to achieve a smoother machine handling,
movement is automatically hydraulically decelerate by reducing the opening of proportional valve.
Telescope
Telescope system is composed by three parts, the third boom that contains a first telescope and a second telescope, they
are all opened or closed together by an unique internal cylinder and a system of ropes and pulleys.
A microswitch is in charge to detect an eventual anomalies about the ropes positions.
More details about ropes system and their maintenance are indicate on use and maintenance manual.
Jib
Jib is moved by one cylinder, while moving jib the basket is kept level thanks to the parallelogram system.
Basket Leveling
Basket levelling close circuit is composed by two cylinders, one on the basket and one on the third boom connection rod,
basket is automatically kept levelled while third boom is moving because of the basket cylinder is moved by connection
rod cylinder.
In particular, while third boom is opening, the connection rod cylinder will be closing so that its oil will be send to the bas-
ket cylinder achieving the automatic basket levelling.
Of course is possible to adjust basket levelling acting on its joystick.
Basket Rotation
Basket rotation is carried out by the basket rotation actuator composed by two chambers, the maximum rotation possible
is 62° on both directions achieving a total of 124°.
Two black arrows show the basket aligned position.
Turret 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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