Hinowa LightLift 15.70 3S, Technical Course Booklet

Page: 61 / 137

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Aerial part valveblock is fed by line “A” through deviator valve and 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 proper oil rate, then 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 165 bar with engine running at maximum speed.
Through aerial part valveblock are fed the turret rotation motor, the cylinder
for moving 1
st and 2 nd booms, the cylinder for moving the 3 rd boom, the
telescope cylinder, the jib cylinder, the basket rotation actuator and the basket
levelling circuit.
On each cylinder and actuator is installed a couple of calibrated valves, one
each direction, when a movement is in progress on one direction the opposite
valve is piloted to open letting oil flow back to the valveblock.
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.
Those valves also help contemporaneity for the main movements.
8.5.1 FIRST AND SECOND BOOMS
1 st and 2 nd booms are moved together by one cylinder through the connection
rod designed to obtain a double parallelogram system.
COUPLE OF
CALIBRATED
VALVES
CONNECTING ROD