Because of the way they particularly work, hydraulic truck cranes are different from other crane types. Instead of using a winch in order to wind up cables to provide the lifting force, hydraulic cranes utilize oil instead. Because oil is a fluid that retains its volume, it is incompressible. Therefore, this means it is among the most ideal types 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 operator from the controls in his cab. Normally, hydraulic truck cranes utilize 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 a single engine which controls both the crane and the truck.
Other Components
Boom Telescope: The boom telescope allows the boom to extend or retract thanks to hydraulics.
Jib: Jibs are latticed structure booms..
Boom Swing: The boom swing is a large roller or ball that is connected to the carrier. It is able to 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 which helps the crane maintain its balance by using hydraulics to lift the truck.
Load Movement Indicator: In order to alert the driver that maximum weight is approaching, the load movement indicator's lights flash.
Pump: The pump is the device responsible for steering the outrigger.
Steel Cables: The steel cables are reinforced and run through the jib and the boom. They can generate up to 6350 kg or 14,000 lbs.
Boom Elevation: The boom of the crane ascends with the use of double hydraulic cylinders which can be lowered and raised.
Rotex Gear: The rotex gear is operated by hydraulics and situated under the cab. It enables the boom to swivel on this gear.