The New Liebherr LTM 1150-6.1 Unveiled at SMOPyC


As a world première, Liebherr showed for the first time during the Smopyc 2008 the new mobile crane LTM 1150-6.1.

With 66 m length the 6-axle all-terrain crane offers the longest telescopic boom in its class and thus sets a new benchmark. It reaches hook heights of up to 93 m and radii up to 76 m with the telescopic boom extensions and the double swing-away jib.

The new LTM 1150-6.1 can carry up to 15 t of counterweight with an axle load of 12 t and a total GVW of 72 t. With this configuration it can handle the majority of its crane jobs. Accordingly, the new 150 t crane offers the advantage of a real taxi crane. With this new model, Liebherr extends the concept of the "all-in cranes" up to the 6-axle mobile cranes and introduces the strongest crane of this design principle to the market.

The 6-axle carrier of the LTM 1150-6.1 has a length of only 13,5m and its turning radius of 11 m is only slightly larger than those of the 5-axle cranes of the 150 to 160 t class. This is the result of both the compact axle grouping and the active rear axle steering which was developed by Liebherr and has proven its reliability on numerous other LTM models. The steering angle of the rear axles are actively controlled depending on the driving speed. All six axles are steered, thus the need for lifting of axles for crab steering is eliminated. Five different steering programs can be activated at the touch of a button. The width of the carrier with 14.00 and 16.00 tires is only 2,75m. Besides the maximum support base of 8,3m support widths of 6,8m, 5,4m and 2,75m are available as standard.

The LTM 1150-6.1 is equipped with pneumatic disk brakes which Liebherr is the first manufacturer to have introduced to the mobile cranes sector and which offer remarkably higher braking power in comparison to the usual drum brakes. A further advantage is the good control of the brake power which optimizes stability. Furthermore they offer longer service intervals as well as an easy and fast exchange of the brake pads, which are equipped with wear indicators.

The new LTM 1150-6.1 is driven by a Liebherr turbocharged diesel V8 engine with proven databus control. This engine from the new Liebherr engine generation develops 544 hp at 1900 rpm and a torque of 1900 lb ft at 1500 rpm. The 12-speed ZF-TC-Tronic gearbox with automatic gear change and dry clutch ensures an optimized fuel consumption. As a constant brake an intarder is integrated in the gear box as standard. A torque converter allows for minimum crawler speeds during start of driving as well as for maneuvering.

The 66 m long telescopic boom consists of the heel section and five telescopic sections and is extended and retracted comfortably by the fast cycle telescoping system Telematik. Up to two lattice sections, each 7 m long, for extending the telescopic boom provide an increased heel point for the 10,8 to 19,0m long swing-away jib, which can be hydraulically adjusted between 0° and 40° under full load as an option. At its telescopic boom of 60 m length the crane can lift up to 11 t and is therefore ideally designed for the assembly of tower cranes. This capacity can be achieved also with only 15 t of counterweight as a taxi crane. At the 66 m boom the LTM 1150-6.1 offers a capacity of 7,7t. For comfortable assembly jobs a second winch and a 2,9m long assembly jib can be offered. As an alternative a boom nose is available.

The tail swing amounts to only 4,3m and the counterweight width is limited to only 2,75m up to a counterweight of 30,8t. The maximum counterweight of 46,8t is provided by attaching two slabs of 8 t each at the side.

The drive of the crane functions is diesel-hydraulic, whereas the electric "load sensing" control assures sensitive working motions. Up to four movements can be made simultaneously. The slewing gear is changeable from "open" to "hydraulically locked" as standard. Thus the movement can be optimally adjusted to the various working conditions, e.g. for sensitive assembly work or for fast lifting cycles.

The cabins for driving and crane operation offer the operator an ergonomic and comfortable working environment. For a convenient and safe access the crane cabin is equipped with an extendable foot board. To improve the visibility the cabin can be tilted up to 20° backwards. The option list for the new LTM 1150-6.1 includes air conditioning, working range limiter, outrigger force monitoring device, etc.

Source: Liebherr-Werk Ehingen GmbH

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