Hydraulic truck cranes are different compared to other crane models due to the way they particularly operate. Hydraulic cranes use oil instead as opposed to using a winch in order to wind up cables to provide the lifting force. As oil is a fluid which retains its volume, it is incompressible. Thus, this means it is amongst the most ideal kinds of fluids for pushing pistons towards the direction the force is going to be exerted.
The hydraulic pump generates a pressure that moves the piston. This particular action is maneuvered by the operator using the controls in his cab. Typically, hydraulic truck cranes make use of a 2 gear pump.
Since the actual crane itself is mounted on a truck, it could travel numerous distances from job to job and there is little dismantling involved. The truck crane has one engine which controls both the crane and the truck.
Other Parts
Boom Telescope: The boom telescope is due to a specific hydraulic operation that allows the boom to retract or extend.
Jib: The jib is a latticed structure that extends from the boom.
Boom Swing: The boom swing is a big roller or ball which is connected to the carrier. It is able to swing 360 degrees in both directions. Hydraulic devices provide swings at varying speeds and control the swing in order to rotate the turntable gearbox.
Outrigger: Outriggers are units that cranes would utilize 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 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 could generate up to 6350 kg or 14,000 lbs.
Boom Elevation: The crane's boom ascends using double hydraulic cylinders which allow for raising and lowering materials.
Rotex Gear: The rotex gear is operated by hydraulics and located underneath the cab. It enables the boom to swivel on this gear.