Due to 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. Since oil is a fluid which retains its volume, it is incompressible. Hence, 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 operator from the controls in his cab. Normally, hydraulic truck cranes use a pump which has 2 gears.
As the actual crane itself is mounted on a truck, it is able to travel numerous distances from site to site and there is little dismantling involved. The truck crane has a single engine that controls both the crane and the truck.
Other Parts
Boom Telescope: The boom telescope is due to a specific hydraulic operation that enables the boom to retract or extend.
Jib: Jibs are latticed structure booms..
Boom Swing: Boom swings have a big roller or ball attached to the carrier. It can 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: 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 that flash in order to alert the driver that maximum weight is approaching.
Pump: The pump's purpose is to steer the outrigger.
Steel Cables: The steel cables are reinforced and run through the boom and the jib. They could generate up to 14,000 lbs. or 6350 kg.
Boom Elevation: The boom of the crane ascends with the use of double hydraulic cylinders which are capable of being raised and lowered.
Rotex Gear: The rotex gear is operated by hydraulics and located beneath the cab. It allows the boom to swivel on this gear.