Because of the way they particularly work, hydraulic truck cranes are different from other crane types. Rather than using a winch in order to wind up cables to provide the lifting force, hydraulic cranes use oil instead. Because oil is a type of fluid that retains its volume, it is incompressible. Therefore, this means it is one of 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 particular action is maneuvered by the driver utilizing the controls inside his cab. Usually, hydraulic truck cranes make use of a pump which has 2 gears.
As the actual crane itself is mounted on a truck, it is able to travel many distances from job to job and there is little dismantling involved. The truck crane has one engine that controls both the truck and the crane.
Other Components
Boom Telescope: The boom telescope allows the boom to retract or extend because of hydraulics.
Jib: The jib is a latticed structure that extends from the boom.
Boom Swing: The boom swing is a large ball or roller that is connected 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: The load movement indicator is lights which flash so as to warn 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 can generate up to 14,000 lbs. or 6350 kg.
Boom Elevation: The crane's boom ascends with the use of double hydraulic cylinders that could be lowered and raised.
Rotex Gear: The rotex gear is operated by hydraulics and located under the cab. It enables the boom to swivel on this gear.