Because of the way they specifically work, hydraulic truck cranes are different compared to other crane types. 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 fluid which 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 pressure generated by the hydraulic pump moves the piston. This action is maneuvered by the driver utilizing the controls within his cab. Usually, hydraulic truck cranes make use of a 2 gear pump.
Since the actual crane itself is mounted on a truck, it is able to travel numerous distances from job to job and there is little dismantling involved. The truck crane has one engine that can control both the truck and the crane.
Other Components
Boom Telescope: The boom telescope enables the boom to retract or extend thanks to hydraulics.
Jib: The jib is a latticed structure that extends from the boom.
Boom Swing: Boom swings have a large ball or roller connected to the carrier. It is able to swing 360 degrees in both directions. Hydraulic mechanisms control the swing and provide swings at various speeds in order to rotate the turntable gearbox.
Outrigger: Outriggers are units that cranes will use to maintain its balance. It uses hydraulics to lift the truck.
Load Movement Indicator: The load movement indicator is lights that flash in order to warn 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 jib and the boom. They can generate up to 14,000 lbs. or 6350 kg.
Boom Elevation: The boom of the crane ascends using double hydraulic cylinders which allow for raising and lowering supplies.
Rotex Gear: The rotex gear is situated under the cab and operated by hydraulics. It enables the boom to swivel on this gear.