Because of the way they specifically work, hydraulic truck cranes are different from other crane models. Rather than using a winch in order to wind up cables to provide the lifting force, hydraulic cranes use oil instead. As oil is a type of fluid which retains its volume, it is incompressible. Thus, 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 hydraulic pump creates a pressure which moves the piston. This action is maneuvered by the driver utilizing the controls within his cab. Typically, hydraulic truck cranes make use of a 2 gear pump.
Because the actual crane itself is mounted on a truck, it can travel numerous distances from site to site and there is little dismantling involved. The truck crane has one engine which controls both the truck and the crane.
Other Components
Boom Telescope: The boom telescope is due to a particular hydraulic operation which allows the boom to extend or retract.
Jib: The jib is a latticed structure that extends from the boom.
Boom Swing: Boom swings have a large roller or ball attached to the carrier. It can swing 360 degrees in both directions. Hydraulic devices provide swings at varying speeds and control the swing in order to rotate the turntable gearbox.
Outrigger: The outrigger is a unit that helps the crane maintain its balance by using hydraulics to lift the truck.
Load Movement Indicator: In order to warn the operator that maximum weight is approaching, the load movement indicator's lights flash.
Pump: The pump is the mechanism responsible for steering the outrigger.
Steel Cables: Steel reinforced cables run through the jib and the boom. They are able to generate up to 6350 kg or 14,000 lbs.
Boom Elevation: The crane's boom ascends utilizing double hydraulic cylinders which allow for raising and lowering materials.
Rotex Gear: The rotex gear is operated by hydraulics and situated beneath the cab. It enables the boom to swivel on this gear.