Due to the way they particularly work, hydraulic truck cranes are different compared to other crane models. Instead of utilizing a winch in order to wind up cables to provide the lifting force, hydraulic cranes use oil instead. As oil is a kind of fluid which retains its volume, it is incompressible. Thus, this means it is among the most ideal kinds of fluids for pushing pistons towards the direction the force is going to be exerted.
The hydraulic pump generates a pressure that moves the piston. This action is maneuvered by the driver using the controls in his cab. Typically, hydraulic truck cranes use a 2 gear pump.
Because the actual crane itself is mounted on a truck, it is able to travel many distances from site to site and there is little dismantling involved. The truck crane has one engine which could control both the truck and the crane.
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 large ball or roller which is connected to the carrier. It is able to 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: Outriggers are units that cranes will utilize to maintain its balance. It uses hydraulics to lift the truck.
Load Movement Indicator: The load movement indicator is lights which flash in order to warn the operator that maximum weight is approaching.
Pump: The pump is the mechanism responsible for steering the outrigger.
Steel Cables: Steel reinforced cables run through the boom and the jib. They are able to generate up to 14,000 lbs. or 6350 kg.
Boom Elevation: The boom of the crane ascends using double hydraulic cylinders which allow for lowering and raising supplies.
Rotex Gear: The rotex gear is situated beneath the cab and operated by hydraulics. It enables the boom to swivel on this gear.