Liebherr-Werk Ehingen in Germany presented its new LTM 1750-9.1 all terrain crane (announced in IC July 2011, page 23) during its customer days event in June 2012. The 750 tonne capacity machine sits between the 500 tonne LTM 1500-8.1 and 1,200 tonne LTM 11200-9.1.
A particular feature of the latest nine-axle unit is its ability to carry its complete telescopic boom on public roads. The wide-range of axle load limits around the world was a consideration in the design, said Liebherr.
With its 52 metre telescopic boom, the telescopic boom Y-type guying system, and a range of lattice jibs, the crane can achieve a height under hook of 154 m and outreach to 112 m. The luffing fly jib can be extended in 3.5 m increments, out to 91 m. Luffing the lattice jib, up to 62 m long, can, as an option, be carried out hydraulically, which means that it can also be adjusted under load.
A special auxiliary jib, with a capacity of 56 tonnes, is also available for operation on the telescopic boom, at the fixed jib, and at the luffing jib. There are individual load capacity tables for this jib in the LICCON load moment limiting system.
The LTM 1750-9.1 travels with its full telescopic boom, the front outrigger supports, an auxiliary one at the rear, and complete hoist gear, at a gross weight of 108 tonnes, with an axle load of 12 tonnes, Liebherr said.
When the LTM 1750-9.1 arrives on site with its telescopic boom and the front outrigger supports, it can fit the rear supports itself, without the need for an auxiliary crane, with the aid of the optional additional support at the rear of the vehicle.
Power in the carrier of the LTM 1750-9.1 is from an eight-cylinder Liebherr diesel engine, rated at 450 kW and 2,856 Nm torque.