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The demands of Liebherr’s new 5-axle crane in the lower lifting capacity range were high and, in part, contradictory – it had to be lightweight so that it could be driven anywhere. But it also had to have a long telescopic boom, and of course it also had to be able to hoist heavy loads! Somehow our designers and structural engineers managed to do it – although the new LTM 1110-5.1 is such a lightweight construction that its gross weight is just 48 tonnes with axle loads of less than 10 tonnes, its 60 metre telescopic boom and maximum ballast of just 29 tonnes enable it to exceed the performance of its rivals on the market.
Mobile cranes can drive on the public roads in most countries with a 12 tonne axle load. That is one of the basic design objectives for any mobile crane. But the fact is that less is often more or better, for example when applying for permits and licences for specific routes. Bridges with weight limits, restricted driving in city centres and daytime-dependent regulations also cause hurdles. And in some countries the legislators actually demand a maximum axle load of 10 tonnes. And the new LTM 1110-5.1 can do it all. And it can do it particularly well because it can switch between different axle load versions quickly. Our solution is centred around “quick-change ballast”. Ballast slabs are no longer screwed to the slewing platform, but instead are bolted in such a clever way that they can be fitted and removed in a matter of moments.
But sometimes we can use more – wherever higher axle loads are permitted and driving on site with lots of ballast. The new 110 tonne crane can do that well, too, because it delivers uniform axle load distribution in these situations with the telescopic boom lowered and therefore secured.
Improved performance due to VarioBase® Plus
A powerful quick-erection crane carries lots of ballast with an axle load of just 12 tonnes. That enables it to tackle a large proportion of crane jobs without requiring additional ballast transport, making it particularly economical. For the new LTM 1110-5.1, that means up to 13.4 tonnes of counterweight – an outstanding value in the 5-axle class.
Familiar and time-tested – the VarioBase® variable support base generates higher lifting capacities in the areas above the outriggers. However, our engineers went a step further with the new 110-tonne crane – the rear outriggers have a doublestage design and achieve a support width of 8.3 metres. Although that is only 0.65 metres more than at the front on each side, the increase in performance over the rear outriggers is enormous, for example an increase of 29 per cent with a 12-tonne axle load configuration. We call the combination of the trapezoidal and variable support base VarioBase® Plus.
The new gearbox with an oil-cooled multi-disc clutch is pioneering.
TraXon DynamicPerform – manoeuvring made easy
The new ZF-TraXon gearbox is used to transfer the power to the crane's axles. As with its predecessor, the AS-Tronic, the 12 gears are changed automatically. ECOdrive is a new feature. The additional eco mode delivers enhanced drive properties which both save fuel and reduce noise. Meanwhile, Hillstart Aid makes starting on gradients easier.
The “DynamicPerform” version of the TraXon gearbox with an oil-cooled multi-disc clutch is used on the new LTM 1110-5.1, its first outing on a mobile crane. The new module prevents the clutch from overheating and therefore enables prolonged, wear-free manoeuvring, even if it creates high friction energy. The new gearbox enhances starting and manoeuvring actions to the same level of a gearbox with a torque converter.
“For our heavy crane vehicles with up to five axles, we believe that we will enjoy massive benefits from the fact that we supported ZF in the development of the TraXon DynamicPerform and its integration into mobile crane drivetrains. The new gearbox is pioneering”, says Mikica Rafailovic, Chassis Design Department Manager at Liebherr. He has been with Liebherr and involved in the development of technologies for the substructure of mobile cranes for 41 years and has played a leading role in several groundbreaking innovations such as the hydro-pneumatic Niveaumatik suspension, active rear axle steering and the single-engine concept with a mechanical shaft for powering the superstructure.
- Wet discs guarantee long term, wear-free manoeuvring.
- Cooling oil circuit prevents overheating and downtimes.