SECTION 5 - HYDRAULICS
3121623
– JLG Lift –
5-5
"A" pressure line sends oil under pressure to the deviator
valve, this valve is commanded directly by the control
module to feed right side ground valve-block or to aerial
part valve-block.
Deviator valve normally (when not fed) send oil to aerial
part valve-block, so that it feeds right side ground valve-
block only when its coil is energized.
Its coil is not energized (oil to the aerial part) only when
machine is OFF or when machine is stabilized.
"B" pressure line sends oil under pressure to the double
pump valve that normally feeds the left side ground valve-
block.
Double pump valve normally (when not fed) sends oil to
left side ground valve-block, so that it send oil to the devi-
ator only when its coil is energized.
While "N" or "RABBIT" speed are selected, when some
boom manifold movement is in progress, double pump
valve is fed by the control module in order to feed also
with the second pump the boom manifold valve-block,
increasing the movement speed even without increasing
the RPM.
Which movement are speed up by this way depends on
which power system is used on that moment, diesel
engine, electric motor or lithium electric motor for lithium
machines, they are those movements that are better per-
formed with an higher oil rate, for instance telescope
opening is always carried out with both the pumps.
Double pump valve is not fed with contemporaneously
movements and is not fed at minimum speed "TURTLE".
From the three valve-blocks the outgoing oil is collected by the blow-off manifold to the tank filter.
TO THE LEFT
VALVEBLOCK
TO THE SECOND
SPEED ACTIVATION
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