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3) Boom system
The boom system consists of main boom, three extending
booms and extension cylinders.
The two cylinders are of a double acting type. The counter
balance valve makes the cylinders operate at constant speed
regardless of the suspended load.
4) Control Valve
The Hiab 320T-3 stiff boom crane is equipped with
4-function control valve which is for main controls of
the crane (slewing, derrick, winch, extension). This valve is
equipped with built-in main relief and port relief valves shown in
the hydraulic diagram. The relief valves makes that the crane
can not lift in excess of the designed load chart.
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