SECTION 5 - HYDRAULICS
3121623
– JLG Lift –
5-7
On each ground manifold oil rate is controlled through the
proportional valve managed by the control module.
Depending on the movement required, proportional valve
will open accordingly regulating the oil rate, at the same
time the relevant ON-OFF valves (one each movement)
will open feeding the relevant cylinder or drive gear
motor.
Ground manifold maximum pressure valve has to be cali-
brated as indicated on use and maintenance manual, at
200 bar with Diesel engine or 180 bar with electric motor
(185 bar for lithium machine).
When the proportional valve coil is not energized, oil flows
back to the tank.
Left side ground valve-block controls the two left side out-
riggers (n.1 and n.2), the left track drive gear motor and
the tracks widening cylinders.
Right side ground valve-block controls the two right side
outriggers (n.3 and n.4) and the right track drive gear
motor.
5.4
OUTRIGGERS
Outrigger cylinders are controlled by the cylinder valves
block that is screwed on the cylinder. When machine is
setup on outriggers, oil is kept under pressure on the cyl-
inder bottom side, against machine weight, by two
piloted one-way valves installed in series on the cylinder
valves block.
Another piloted one-way valve is installed on the stem
side.
While cylinder movements are in progress the opposite/s
one-way valves is/are piloted to open letting oil flow back
to the valveblock.
BOTTOM
ONE-WAY
VALVES
STEM SIDE ONE-
WAY VALVE
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