Hydraulic truck cranes are different compared to other crane types because of the way they particularly work. Hydraulic cranes use oil rather than using a winch in order to wind up cables to provide the lifting force. Since oil is a fluid which retains its volume, it is incompressible. Hence, this means it is amongst the most ideal types of fluids for pushing pistons towards the direction the force is going to be exerted.
The pressure created by the hydraulic pump moves the piston. This action is maneuvered by the driver using the controls within his cab. Typically, hydraulic truck cranes use a 2 gear pump.
Since the actual crane itself is mounted on a truck, it can travel many distances from job to job and there is little dismantling involved. The truck crane has one engine that could control both the crane and the truck.
Other Components
Boom Telescope: The boom telescope allows the boom to extend or retract thanks to hydraulics.
Jib: The jib is a latticed structure that extends from the boom.
Boom Swing: The boom swing is a big ball or roller that is connected to the carrier. It can swing 360 degrees in both directions. Hydraulic mechanisms provide swings at varying speeds and control the swing in order to revolve the turntable gearbox.
Outrigger: The outrigger is a unit that helps the crane maintain its balance by utilizing hydraulics to lift the truck.
Load Movement Indicator: The load movement indicator is lights that flash in order to alert the driver that maximum weight is approaching.
Pump: The pump is the device responsible for steering the outrigger.
Steel Cables: The steel cables are reinforced and run through the boom and the jib. They are able to generate up to 6350 kg or 14,000 lbs.
Boom Elevation: The boom of the crane ascends utilizing double hydraulic cylinders that allow for lowering and raising materials.
Rotex Gear: The rotex gear is operated by hydraulics and located underneath the cab. It allows the boom to swivel on this gear.