Liebherr to Present New Mobile Crane at Intermat

At the 2009 Intermat April 20-25 in Paris, France, Liebherr will present a newly developed 385-ton mobile crane on a six-axle chassis. With its 229-foot telescopic boom, the LTM 1350-6.1 offers a 32-foot increase of boom length compared to its predecessor, the LTM 1300-6.1. The load capacity has also been greatly improved. The new Liebherr LTM 1350-6.1 with Y-suspension is the strongest six-axle crane on the market.

With especially high capacities at long extended telescopic boom, the LTM 1350-6.1 is suited for tower crane erecting work. Additional capacity improvements result from the Y-suspension, which doubles capacity in many areas. This new six-axle crane from Liebherr can thus perform work that up to now had to be handled by seven- or eight-axle models.

With the almost 256-foot-long luffing fly jib, the LTM 1350-6.1 has a maximum hoisting height of 433 feet, more than 52 feet higher than the previous model. It can therefore operate with the lattice jib in areas previously reserved for mobile cranes in higher capacity classes.

The new LTM 1350-6.1 can self-assemble the Y-suspension without a supporting crane. The suspension frames are placed on brackets at the right and left side of the telescopic boom, then pinned to the heel section of the boom. This practical concept has already proved successful on the LTM 1400-7.1.

For easy, economical counterweight transportation the counterweight frame with the luffing winch for the fly jib installed and the baseplate with counterweight blocks in position can travel as a complete package with a weight of 66 tons a low bed trailer. For crane operation, up to 154 tons of counterweight are used.

The LTM 1350-6.1 chassis is driven by a powerful eight- cylinder Liebherr diesel engine rated at 612 hp at 1,900 rpm, and with a maximum torque of 2,856 NM at 1,500 rpm. Power is transmitted to the crane axles by a 12-speed ZF TC-Tronic gearbox. For drive-off and sensitive manoeuvring, a torque converter is installed. An ‘Intarder’ wear-free hydraulic brake is installed in the gearbox for constant braking. The LTM 1350-6.1 is equipped with air-operated disc brakes, which Liebherr was the first crane manufacturer to introduce at the 2006 Intermat. Disc brakes not only provide a higher braking power but are at the same time more economical due to the fact that their operating life compared with drum brakes is higher and brake pad renewal easier and faster.

The four rear axles of the new 385-ton crane’s six-axle chassis are steered actively, dependent on road speed, by an electro-hydraulic system. This improves manoeuvrability and greatly reduces tyre wear. During crab steering, all six axles are steered and axle lift thus eliminated. Five steering programs can be selected most conveniently at a pushbutton.

The Liebherr four-cylinder inline engine on the crane superstructure develops 245 hp at 1,800 rpm, with a maximum torque of 1,145 NM at 1,500 rpm. Crane drive is diesel-hydraulic, with five variable axial-piston pumps, a servo control system and load sensing control. For maximum sensitivity the winches and the slewing gear are operated by closed circuits. Four simultaneous working movements are possible.

The well-equipped crane cabin, a new design, is located at the side of the boom and does not have to be turned to face rearwards during road travel.

The LTM 1350-6.1 features the new Liebherr LICCON2 crane control system. Compared to the previous version it offers an even higher degree of operating convenience with additional potential applications. Computing power and capacity have also been improved. The color data display on the LICCON2 monitor considerably enhances readability and clarity, so that warnings and crane utilization data are even more legible. Below the joysticks the LICCON2 is equipped with convenient touch actuation of various working functions. These include the driving and steering programmes, the axle suspension, the crane supports, adjustment of the work-area lights and the heating and climate controls.

For erecting tasks a new mobile multifunctional control and display unit is available: the Bluetooth terminal (BTT). It can be used to position the crane easily and safely on its supports. The crane driver can also attach and detach the hook block at the bumper within view by remote control of the hoist winch and the telescopic boom luffing ram through the Bluetooth connection. On the new LTM 1350-6.1 the BTT is also used for attaching the counterweight and for self-assembly of the Y-suspension.

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