Johnson Crane Hire has acquired a Liebherr LR 1750 750 tonne lattice boom crawler crane, which is the only one of its kind in Africa.
“This added capacity will not only open up numerous opportunities for special heavy lift operations, but will give access to other markets such as the energy sector,” Yaman, general manager of Johnson Crane Hire’s Heavy Lift division says.
Yaman says the Liebherr LR 1750 being a crawler crane offers the major advantage of being able to pick up a load and travel with it. “This is in contrast to the conventional truck-mounted or ringertype crane which has limited mobility and cannot walk with the load, and is of particular importance on long-term projects, or projects where there are numerous lift locations,” he says.
Another advantage which will have cost saving implications for customers is the flexibility the massive machine offers in terms of being able to move while fully assembled and rigged from one location to the next. This eliminates the need for multiple mobile cranes on one site. In addition, the ability to carry a load from the first lift location to a second position where it will be placed removes the need for additional transportation between lift locations on site.
The behemoth LR 1750 has the further benefit of being able to handle higher lifts and heavier loads to further radii than any other crane currently available locally. The machine is equipped with additional driving gears with four drive motors on the crawler tracks which facilitates smoother travel, even in poor underfoot conditions.
It is equipped with a 245 tonne machine counterweight and an additional 195 tonne central ballast counterweight. When used for lifts requiring its maximum capacity, the crane is fitted with a 400 tonne super-lift counterweight which is mounted on a suspended super-lift tray.
The Liebherr LR 1750 lattice boom crawler is equipped with a 133 metre main boom, however when in luffing fly-jib configuration it has a main boom length of 84 metres, a luffing fly-jib length of 70 metres and is able to reach a height of 150 metres. With tracks 1.5 metre wide and the use of specialised crane mats ground pressures are substantially reduced and the crane can perform single lifts up to a height of 130 metres. It is powered by a Liebherr eight cylinder turbo-diesel 400 kW engine and can travel at a maximum speed of 1.65 km per hour.
“The crawler crane, being specifically designed for heavyduty industrial applications, is ideally suited for applications in power stations, refineries and petro-chemical plants, minerals processing and smelter plants, large civils and bridge construction sites and the assembly of wind power plants,” Yaman says.