Liebherr LTM 1200
Liebherr launched the LTM 1200-5.1 last year. The LTM 1200-5.1 has a seven-section, 72-metre-long telescopic boom that is extended fully-automatically to the required length using the TELEMATIK single-cylinder telescoping system. An optional seven-metre-long lattice jib section for extending the telescopic boom increases the base point for the 12.2-metre to 22-metre-long biparted swing-away jib.
Infinitely variable hydraulic adjustment of the swing-away jib is optionally available for the new LTM 1200-5.1. It can be luffed at between 0° and 45° under a full load. The 5.3-metre-long base section of the swing-away jib can be equipped with a pulley set, which allows it to be used as an erection jib. It is released simply from the swing-away jib located on the telescopic boom with the aid of the hydraulic swing-away jib adjustment system and then erected on the telescopic boom without the need for an auxiliary crane.
The new LTM 1200-5.1 is the world’s first mobile crane with air-operated disc brakes. A joint development between Liebherr and system partners, the air-operated brake system is integrated in the crane axles and has undergone extensive testing in practical applications. Compared to hitherto customary drum brakes, disc brakes provide a higher braking performance. Metering of the braking action and the vehicle’s directional stability during the braking operation are also optimised. Longer service intervals and shorter working times for brake pad replacement increase profitability. All brake pads are fitted with wear indicators.
The drive train of the crane chassis boasts the proven, fuel-saving LI-AS-DRIVE drive train technology together with a Liebherr diesel engine and automatic ZF-AS-TRONIC gearbox. The retarder integrated in the gearbox reduces wear on the brakes and increases braking safety. The speed control system and the automatic brake system, which maintains the preset speed even during downhill travel, increase user convenience and cost-effectiveness. The two-step transfer case enables minimum creeping speeds to be achieved during all-terrain applications and manoeuvring. The new Liebherr six-cylinder inline engine with a common rail injection system provides 370 kW/503 bhp of power and a maximum torque of 2,350 Nm. It already satisfies the latest requirements relating to exhaust emissions in accordance with the Directives 97/68/EC Stage 3 and EPA/CARB Tier 3.
The new Liebherr four-cylinder inline engine in the crane superstructure also satisfies the latest exhaust emission regulations. With a high power output of 145 kW/197 bhp and a torque of 920 Nm over the entire speed range between 1100 and 1500 min-1, the turbocharged diesel engine ensures rapid work cycles and crane movements. The hoist gear and slewing gear are steered in the closed oil circuit and operate with a particular high level of precision. The hydraulic system boasts five axial piston variable displacement pumps with servo-control and capacity control. Up to four work movements can be carried out simultaneously.
Ballasting of up to 72 tons is available for the new LTM 1200-5.1. At 2.98 metres wide, the 12-ton base slab is narrower than the width of the vehicle. Four additional 10-ton slabs extend the counterweight to 52 tons with a counterweight width of 3.75 metres. In applications requiring maximum ballasting, a 10-ton block must be suspended on the counterweight at both the right and the left. The maximum counterweight radius is 4.85 metres.
