Liebherr: Latest design built on experience

The Liebherr LTM 1110-5.1 mobile crane has become the LTM 1110-5.2 as it has three completely new features – the crane control system, the driver’s cab and the gearbox. First unveiled at Bauma 2019, the Liebherr 110 tonne crane features the new driver’s cab also unveiled at the trade show in prototype form, Liebherr’s new LICCON3 crane control system and also the recently announced ZF TraXon DynamicPerform gearbox. The oil-cooled multi-disk clutch is also new. 

LICCON3 crane control system 

This is now the third generation of the LICCON (Liebherr Computed Control) control system and features the time-tested control features, but has a completely new software package and programming language as well as a faster databus, more storage space and more computing power. Nikolaus Münch, Head of the Control System Department at Liebherr in Ehingen, explains: “During the development of the new control system, it was important to us that crane operators, who are familiar with Liebherr cranes, would be able to get used to the new control system quickly and easily. At the same time, we must be future-proof as the progress currently being made in microelectronics is immense. Complex applications, such as VarioBase, which require a great deal of performance data, can now be developed more frequently in the future. The current LICCON2 control system is reaching the limits of its capacity.” 

The similarities with the current control system are wide-ranging. Time-tested hardware components, such as the BTT remote control terminal, have been included. The touchscreen function on the new large display in the superstructure cab means that it is now easier to control. The way in which the information is shown has also been revised and simplified. In addition, LICCON3 cranes are also prepared for telemetry and fleet management systems as standard. In the future, crane contractors will be able to view and evaluate all the relevant data using the MyLiebherr customer portal. 

Driver’s cab 

Liebherr has developed the modern design of the new driver’s cab in collaboration with designer Jürgen R. Schmid, Design Tech, Ammerbuch (Germany). The modern design features include the new multifunction steering wheel, side roller blind on the driver’s door, improved instruments and modules as well as new displays. Options, such as the central locking system with remote key, the cool box and tyre pressure monitoring system deliver additional comfort. For better working conditions a completely new, modern automatic heating and climate control system in both the driver’s and operator’s cabs has been added as well as a sun sensor that detects strong sunshine and automatically adjusts the heating settings. In addition to the standard radio with hands-free facility, a double DIN radio with extended functions is available as an option.

Nikolaus Münch believes that the revised lighting system is another highlight: “LED technology is a real plus as a result of its long service life. It will last for many more hours of service and also provides better lighting.” The lighting packages for the crane cabs, the superstructure, the rear of the vehicle, the front headlights and the telescopic boom and lattice jibs have been improved and now feature LEDs. 

ZF TraXon DynamicPerform gearbox 

The innovative DynamicPerform clutch module delivers almost zero wear starting and manoeuvring for the modular ZF TraXon gearbox without overheating. The new clutch module transmits the engine power via an oil-cooled plate pack that runs in oil. The friction heat generated when starting is dissipated in the clutch oil and supplied to the vehicle’s cooling system via an oil/water heat exchanger. Due to the higher energy and power consumption, together with a calculation model, permanent and almost wear-free manoeuvring is made possible. An implemented clutch protection function also prevents overheating of the clutch and the associated increased wear or destruction of the clutch in extreme load cases. 

Liebherr was ZF’s partner in the development of the TraXon DynamicPerform and its integration in the drivetrain of mobile cranes. Josef Schick, Head of the Testing Department at Liebherr, says: “As a result of the close collaboration with ZF and a very intensive phase of testing, the new gearbox version is now ready for widespread use. The cooling performance of the DynamicPerform clutch module has been significantly increased yet again by means of improvements to various hardware components. The model has also been refined for calculating the disc temperature. Vehicle tests in a refrigeration chamber at temperatures as low as minus 40 degrees have confirmed that DynamicPerform works very well even in extremely low temperatures. We have managed to solve all the initial problems. Overall we can safely say that there are worlds of differential between a dry clutch and the new wet starting clutch!” 

Initially, Liebherr plans to install DynamicPerform in its 5-axle mobile cranes on a step by step basis. On mobile cranes with six or more axles, Liebherr intends to continue to use the ZF 12-speed TraXon Torque gearbox with starting converter.