Due to the way they specifically operate, 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. Since oil is a type of fluid which retains its volume, it is incompressible. Therefore, this means it is one of the most ideal kinds 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 in his cab. Usually, hydraulic truck cranes use a pump that has 2 gears.
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 a single engine that could control both the truck and the crane.
Other Parts
Boom Telescope: The boom telescope enables the boom to extend or retract because of hydraulics.
Jib: Jibs are latticed structure booms..
Boom Swing: The boom swing is a large roller or ball that is attached to the carrier. It is able to swing 360 degrees in both directions. Hydraulic mechanisms provide swings at various speeds and control the swing in order to revolve the turntable gearbox.
Outrigger: The outrigger is a unit which helps the crane maintain its balance by utilizing hydraulics to lift the truck.
Load Movement Indicator: The load movement indicator is lights that flash so as to alert the driver that maximum weight is approaching.
Pump: The pump's purpose is to steer the outrigger.
Steel Cables: Steel reinforced cables 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 with the use of double hydraulic cylinders which could be lowered and raised.
Rotex Gear: The rotex gear is operated by hydraulics and situated under the cab. It allows the boom to swivel on this gear.