Liebherr continued to follow its development plan with the chassis as well – familiar but ready for the future. The LTM 1110-5.2 is based on the LTM 1110-5.1 with LICCON2 control system, which was first unveiled in 2019. That model was also developed and built to be pioneering. VarioBase®Plus, ECOmode and ECOdrive, a quick-change system for ballast slabs and load charts for different wind speeds are just some of the features of this innovative crane concept.
“The main innovation in the drivetrain on the LTM 1110-5.2 is the first ever use of the TraXon gearbox with the new DynamicPerform clutch module,” explains Martin Dony, an engineer in the Design and Development of Crane Chassis Department. “The wet starting clutch transfers the engine power using integral discs which are cooled by an oil system. This means that multiple starting procedures, even on gradients, and permanent, zero wear manoeuvring is possible without the clutch overheating or suffering wear.” On page 85 in the section entitled “Simply explained”, Martin Dony tells us more about the background to the wet starting clutch for the TraXon DynamicPerform gearbox system and how it works. Josef Schick, Trial Department Manager, continues delightedly: “All the development challenges were overcome. We can safely say that there are worlds of differential between a dry clutch and the new wet starting clutch! The close collaboration with ZF and intense testing means that the gearbox version is now ready for widespread use.” And there is a minor addition to the drivetrain – the emissions treatment system on the diesel engine with SCR catalytic converter and particulate filter has now been certified for both Europe and the USA. This is a major advantage, particularly for international crane contractors.
Our engineers have also added a new feature to the active rear axle steering – the signal transfer to the sensors has been significantly improved. This reduces the number of failures and increases the level of availability. A plus point for greater economy – the hydraulic switching of the active rear axle steering has been improved so that it reduces fuel consumption.