Due to the way they specifically work, hydraulic truck cranes are different compared to other crane types. As opposed to using a winch in order to wind up cables to provide the lifting force, hydraulic cranes use oil instead. As oil is a fluid that retains its volume, it is incompressible. Hence, 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 that moves the piston. This action is maneuvered by the driver using the controls in his cab. Typically, hydraulic truck cranes utilize a pump which has 2 gears.
Because 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 one engine which controls both the truck and the crane.
Boom Telescope: The boom telescope enables the boom to retract or extend because of hydraulics.
Jib: The jib is a latticed structure which 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 mechanisms control the swing and provide swings at varying speeds in order to revolve 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 which flash in order to alert the operator 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 14,000 lbs. or 6350 kg.
Boom Elevation: The crane's boom ascends with the use of double hydraulic cylinders which can be raised and lowered.
Rotex Gear: The rotex gear is situated underneath the cab and operated by hydraulics. It allows the boom to swivel on this gear.