Liebherr has introduced its latest all-terrain crane, the four-axle LTM 1120-4.1, which will be officially unveiled at Conexpo/Con-Agg.This 120-t model offers a maximum boom length of 66 m and a lifting capacity of 9 t.
Lattice extensions enable the new LTM 1120 4.1 to achieve hook heights of up to 94 m and radii of up to 64 m. For this, a 7-m lattice boom extension is installed as well as a 10.8- to 19-m double folding jib - which, as an option, can be hydraulically adjusted between 0° and 40°. A 2-m erection jib and a runner, which can be swung to the side, round off the equipment list.
The LTM 1120 4.1 is able to work where there is insufficient space for larger cranes. On constricted sites, in particular, Liebherr’s VarioBallast and VarioBase innovations ensure enhanced performance, flexibility and safety for this new model.
With VarioBallast, the LTM 1120-4.1 can operate with a ballast radius of 3.83 m or 4.77 m. This ballast radius can be easily reduced by 940 mm using standard, mechanically adjustable ballasting cylinders when site conditions get tight. The large ballast radius delivers higher performance and also cost benefits by reducing ballast transport, as many crane jobs can be completed using the system with fewer counterweights.
The maximum of 31 t of ballast is distributed so variably that in addition to the 12-t axle load version, uniform axle loads of 13.5-, 14.5- and 16.5-t can also be achieved. This is beneficial when driving on construction sites and in countries where higher axle loads are permitted.
A six-cylinder Liebherr diesel engine in the undercarriage, which develops 330 kW and torque of 2,335 Nm provides the LTM 1120-4.1 with all the power it needs. The engine satisfies the new stage V emissions directive and can also be built to comply with the regulations in countries outside of Europe, including Tier 4 for the US and Stage III for low regulated countries.
The ZF-TraXon gearbox transmits the power to the crane’s axles. The ECOdrive offers enhanced drive properties, thus saving fuel and minimising noise. Hillstart Aid makes starting on gradients easier.
The ECOmode for crane operations is now standard on Liebherr mobile cranes with a load-sensing control system – the crane controller calculates the perfect engine speed for the working speed selected using the control lever to avoid unnecessarily high engine speeds. This also saves fuel and makes the engine quieter.