A 250 tonne capacity all terrain crane on five axles is new from Liebherr in Germany.
The manufacturer describes its LTM 1250-5.1 as “the most powerful 5-axle mobile crane on the market.” It was unveiled to around 3,000 people at the Customer Days event in week 25 at the wheeled and crawler mounted mobile crane factory in Ehingen, Germany.
It succeeds the LTM 1220-5.2 and is the third model with a single engine design. Load capacity is 15 to 20 % greater than its predecessor and it has the same 60 metre boom length. Lattice extensions can increase hook height to 110 m. A 50 m fixed jib is available and the 12.2 to 22 m folding jib can be extended in 7 m sections to 36 m. Another option is hydraulic adjustment up to 45 degrees under full load. Some of the sections can also be used on the 200 and 220 tonne capacity models.
Other features include the VarioBase variable outrigger system and Eco mode to save fuel. VarioBallast is a new feature that allows operation with two ballast radii, of 5.58 m or 4.78 m. For operation in confined spaces the ballast radius can be reduced by 800 mm using mechanically swivelling ballasting cylinders. Maximum ballast is 88 tonnes with a maximum width of 6.3 m. The 1 tonne base plate and the next 10 tonne ballast plate are the same width as the vehicle. Width is 4.1 m with up to 68 tonnes of ballast.
Power is from a 400 kW six-cylinder Liebherr diesel engine in the carrier to Stage IV / Tier 4f emissions regulations. It drives via a 12-speed ZF-AS-Tronic automated manual gearbox. For low speed manoeuvring on site there is a two-stage low range gear. For braking there is an intarder integrated in the gearbox. An additional Telma eddy current brake is also an option.
For crane operations, the hydraulic pumps in the superstructure are powered via a mechanical shaft from the engine in the carrier below. High efficiency of a mechanical shaft and low engine speed in the chassis engine “ensure the economy of the new concept in terms of fuel consumption,” the manufacturer said.