Because of the way they specifically work, hydraulic truck cranes are different from other crane models. Instead of using a winch in order to wind up cables to provide the lifting force, hydraulic cranes use oil instead. As oil is a kind of fluid which 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 generates a pressure which moves the piston. This action is maneuvered by the operator using the controls within his cab. Normally, hydraulic truck cranes utilize a pump that has 2 gears.
As the actual crane itself is mounted on a truck, it can travel many distances from site to site and there is little dismantling involved. The truck crane has a single engine that controls both the truck and the crane.
Other Parts
Boom Telescope: The boom telescope is due to a specific hydraulic operation which enables the boom to extend or retract.
Jib: Jibs are latticed structure booms..
Boom Swing: Boom swings have a big roller or ball attached to the carrier. It is able to swing 360 degrees in both directions. Hydraulic mechanisms 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's purpose is to steer the outrigger.
Steel Cables: The steel cables are reinforced and run through the jib and the boom. They are able to generate up to 14,000 lbs. or 6350 kg.
Boom Elevation: The crane's boom ascends using double hydraulic cylinders that allow for raising and lowering materials.
Rotex Gear: The rotex gear is operated by hydraulics and located beneath the cab. It allows the boom to swivel on this gear.