Hydraulic truck cranes are different from other crane types because of the way they specifically work. Hydraulic cranes use oil instead as opposed to utilizing a winch in order to wind up cables to provide the lifting force. Since oil is a type of fluid which retains its volume, it is incompressible. Hence, this means it is among the most ideal kinds of fluids for pushing pistons towards the direction the force is going to be exerted.
The pressure created by the hydraulic pump 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.
The truck mounted crane could move from one location to another with little need for dismantling. The truck crane has one engine which controls both the crane and the truck.
Other Components
Boom Telescope: The boom telescope is due to a specific hydraulic operation which 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 that is attached 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 would utilize to maintain its balance. It uses hydraulics to lift the truck.
Load Movement Indicator: The load movement indicator is lights that flash so as 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 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 lowered and raised.
Rotex Gear: The rotex gear is situated under the cab and operated by hydraulics. It allows the boom to swivel on this gear.