Liebherr HS 8300 HD
The largest hydraulic heavy duty crane made by Liebherr up to now is the Liebherr HS 8300 HD, a 300 tonne heavy duty crane.
This unit was tested by the manufacturer in practice on a graval mining in the south of Germany. The use is as a dragline with 44 meters of boom and a 7 cubic meter bucket.
In this configuration weights the crane around 370 tonnes. The crane is powered by a Liebherr diesel engine with 750 kW / 986 hp. A nice detail are the three large coolers in the superstructure.
For the transport over the road is it required to split the superstructure with the undercarriage. The superstructure weights complete 99.9 tonnes. By removing the winches and the A-frame it can be reduced to 69 tonnes.
Here the crane was working with a 7 cubic meter bucket, fully loaded it has a 25 tonne weight. On other days the crane was tested with a shorter boom and a 14 cubic meter bucket, that has fully loaded a weight of 48 tonnes.
The undercarriage has a 6.9 meter width.
The boom sections are 2.86 meters heigh and 2.93 meters wide. The max. boom length as lifting crane is 68 meters, as a dragline 50 meters.
The undercarriage exists out of a 36.25 tonne center section, on them are directly the crawlers attached. The cabin can only be reached by the stairs on the rear.
The counterweight weights 78.3 tonnes. That exists out of a 18.3 tonne base plate with in total 12 slabs with each 5 tonnes stacked on it. The counterweight has a 7.84 meter tailswing. The counterweight must be installed with assist of an other crane. The counterweight slews 2.4 meters above the ground.
The large fairlead is moved hydraulically left and right to drum the drag rope better on the winch.
This crane is equiped with the Pactronic system, a hydraulic system to buffer energy. By lowering loads energy is stored into the buffers, that energy can partly be re-used by lifting loads. The Pactronic system suplies together with a 750 kW diesel engine about 1,250 kW. The crane is more powerfuller with this system and it reduces the fuel consumption significantly.
The Pactronic cylinders are mounted on both sides below the walkways of the superstructure.
A single track is 9.55 meters long, 1.9 meters wide (track pads 1.5 meters) and a 2.18 meter height. The mass each is 46.4 tonnes.
The crane is equiped with two 50 tonne free fall winches. Both cables do have a 46 mm diameter. The velocity of the winch is 125 m/min. The adjustment winch for the boom has a 15 tonne capacity and needs 130 seconds to adjust the boom from 15 to 84 degrees.
A very beautiful and impressive machine to see and hear!