Liebherr's Long-Boom Three-Axle Mobile Crane

Liebherr's LTM 1060-3.1 mobile crane is a 66-ton machine that has a 157-ft. long telescopic boom - the largest boom in the three-axle range from Liebherr.

Ballast Concept

At a total weight of 39.6 t and with a 13.2-t axle load, it includes a 6-t ballast, 16.00 tires, eddy current brake, 6'x6' drive and a hook block. At an axle load of 13.2 t, a special ballast plate configuration was implemented in the design. Depending on the crane equipment and the required vehicle payload, the ballast carried may be 4.1 t, 4.7 t, 5.4 t or 6.1 t.

To increase the load capacity, 8 t of additional ballast is available so that the machine can be used with a maximum ballast of 14 t. To accommodate countries without the 13.2-t axle load restriction: The LTM 1060-3.1 drives at approx. 16.5 t per axle with maximum ballast.

Travel Gear Technology

The 31-ft. long chassis is just 8.4-ft. wide, with the 445/95 R 25 (16.00 R 25) tires. The turning radius measured over the driver's cab is just 25 ft. and the ballast radius remains within 11.6 ft. A support width of 21 ft. is achieved with single telescoping sliding beams. Where space is tight, a reduced support width of 15 ft or 7.5 ft. can also be used. The crane is leveled automatically during the support process.

The machine has an air activated disk brake that offers greater braking force that remains consistent even at high brake temperatures, compared to conventional drum brakes. The longer service life durations also contribute to efficiency. The disc brakes are equipped with wear indicators.

The active, speed-dependent rear axle steering system is used in the new LTM 1060-3.1. This reduces tire wear considerably. The driver has five different steering programs available that can be selected for a variety of driving situations.

The six-cylinder Liebherr in-line engine in the chassis achieves 270 kW / 367 HP and reaches a maximum torque of 1700 Nm. The force is transferred to the crane axles via the 12-speed ZF-AS-Tronic  gear box. A two-stage distributor gear permits minimal creep speeds in maneuvering mode. The machine has an anti-lock braking system.

Long telescopic boom

The six-part 157-ft. long telescopic boom on the LTM 1060-3.1 is telescoped in and out via rapid action Telematik telescoping system. With the 31-ft. to 52-ft. long swing-away jib, the machine achieves hoisting heights up to 207-m. and boom radii up to 157-ft. The swing-away jib can be attached at an inclination of 0°, 20° or 40°. For work in two hook operation, a second hoist gear, a 8-ft. assembly jib and a rooster sheave is available.

Load Sensing and LICCON2

In the hydraulic system, the electric load-sensing control ensures accurate work operations. Up to four movements can be actuated simultaneously. Depending on the requirements for the lifting task of the crane driver, the slewing gear can be easily switched from "open" to "hydraulic locked".

The Liebherr LICCON2 crane control is used in the LTM 1060-3.1. A mobile, multifunctional control and display unit - BTT Bluetooth terminal - is provided for upgrade functions. The crane driver has the option of attaching and removing the hook block on the crane bumper with visual contact via remote control of the hoist winch and the luffing cylinder of the telescopic boom.

The Liebherr LICCON2 mobile crane control offers the option of conversion into a complete remote control system for the crane. Other than the relevant software on the crane, all that is required is a console with two master switches, which the existing BTT plugs into. The console can also be used for other cranes with LICCON2 controls programmed for remote control operation.


Source: Crane & Rigging Hotline

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