Liebherr has launched a 60t-class AT with 50m boom, which surpasses its predecessor, the LTM 1060/2, by 8m. It can lift 900kg to 36m radius with 10.7t counterweight. Hook height is approximately 50m.
Although called the LTM 1070-4.1, its 70t rated capacity is only over the rear and maximum counterweight of 14.5t. With standard counterweight of 10.7t, the LTM 1070-4.1 lifts 51t at 3m radius and 11m of boom. By comparison, the LTM 1060/2 can lift 51t 360° around the crane with 12t of counterweight and 11m of boom. It can lift 1.1t to 38m radius. Hook height is approximately 42m.
Still, Liebherr says it increased the load capacity between 10% and almost 30%. The crane also features a 16m long biparted swing-away jib that can be put into fitting position hydraulically by means of a cable remote control, and can be operated at 0, 20, 40, and 60 degree inclination. An optional extra is the hydraulic variation of the swing-away jib from 0 to 60 degrees. This is designed to enable stepless luffing under full load.
Says Liebherr: ‘The LICCON system interpolates automatically the load capacities for any telescopic boom and swing-away jib angle. By fitting of a rope pulley set or a hook crossbeam, the base section of the swing-away jib is transformed into a 3.2m long erection jib, which is also inclinable up to 60 degree. If the customer opts for the hydraulic variation of the swing-away jib, the erection jib is also luffed hydraulically.’
The new crane weighs 48t and has a 10.7t counterweight. Additional 3.8t counterweights are also available.
The oviform telescopic boom uses Liebherr’s Telematik system for automatic interlocking.
The 270kW/327HP displacement drive with Liebherr turbocharged diesel engine and the ZF automatic transmission with torque converter are controlled by a CAN bus drive management.
Three further Liebherr system busses (LSB) are installed for additional control functions. The company explains: ‘The retarder, eddy current brake, speed controller, suspension, rear-axle steering, outrigger system, and the entire vehicle lighting are controlled by microprocessors. Also the sensors on the crane superstructure such as length sensors, slewing sensors, angle sensors, hoist limit switches, proximity switches and master switches are equipped with micro controllers and are interconnected by bus technology. The reliability of all components is ensured by a continuous self-test routine.’
700 LTM 1060/2s have been sold between 1999 and 2004.
