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3.2
CRANE OPERATION
In order to function the crane needs a drive unit and a hydraulic pump connected to it, as well as
the necessary hydraulic equipment (such as an oil tank, filters, hydraulic pipes). All movements are
hydraulic. Different functions (turning and lifting the boom, compressing the grab, etc.) are
achieved by channelling pressurised oil with the hydraulic cylinder to the desired control valve. The
crane operator can control a number of functions simultaneously, as required.
3.3
CRANE EQUIPMENT OPTIONS
3.3.1 Basic crane models
KESLA timber handling cranes are delivered from factory as complete tested assemblies with sev-
eral options for standard equipment from which the customer can choose the most suitable one.
- Basic crane
* Controls can be mounted directly behind the tower or to its side.
* The control valves are delivered with 2 or 4 levers according to the customer's choice.
* The low control valve (= bearer foot valve) is delivered, according to the operations required, with
3 to 5 stems (for example bunk transport, stand transport, etc.). In addition, it can be either elec-
tronically or mechanically controlled.
* The hinged boom can be with 1 or 2 extensions.
* The hydraulic system can be either a one-circuit (1 pump) or a two-circuit (2 pumps) system. In
addition, the system can be implemented with either a fixed-displacement or an adjustable-
displacement pump.
27
ABOUT THE CRANE
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