Liebherr LTM1160/1200/1220: boom and carrier editions

Boom sections, carrier width and separate crane engines

These Liebherr cranes have separate power sources for road travel and lifting. In the September 2006 LTM 1160-5.1 document, the carrier uses a six-cylinder D846 A7, while the superstructure uses a four-cylinder D934S A6. The upper engine drives the crane's hydraulic pumps; its power figure is not the carrier's road-engine rating.

This is also why a later LTM 1160-5.2 sheet cannot identify the engine arrangement of this 5.1. The model suffix is part of the machine's identity. LTM 1160-5.1, TD 162.01.US09.2006.

The 1160-5.1's Telematik boom has a base and five telescoping sections. A figure counting only the moving sections is different from a count including the base. The same document separates basic counterweight from an additional counterweight package.

Its second hoist is optional, for two-hook work or jib operation while leaving the main rope reeved. A photograph of an installed jib alone does not establish that the second hoist is fitted.

The LTM 1200-5.1 keeps the D934S A6 upper engine in this original document, but its boom has a base and six telescoping sections. Its longer boom and different counterweight schedule explain why sharing the carrier engine does not make its lifting chart interchangeable with the 1160's. Both drawings show a carrier width of 9 ft 10 in with 16.00 R25 tyres, increasing to 10 ft 2 in with the optional 20.5 R25 tyres.

The much larger dimensions across the outrigger drawing describe support positions, not road transport width. LTM 1200-5.1 equipment and dimension drawings.

On the 1200's road steering system, rear-axle behaviour changes with speed. The document also distinguishes hydraulically lockable Niveaumatik suspension from the steering circuits. Those are separate systems to identify during a carrier inspection; an outrigger levelling control is not a road-suspension adjustment.

The optional extra driven axle changes the drive arrangement without making the lifting setup equivalent to a different counterweight or boom combination.

The April 2013 LTM 1220-5.2 sheet identifies LICCON2 load monitoring, an upper cab that tilts rearward, and separate AdBlue reservoirs for carrier and crane engines. Its listed upper-engine torque is 841 lb-ft, rather than the earlier 1,140 lb-ft entry. That older number is retained separately, with the manufacturer document and edition attached to its replacement.

The electrical specification is two batteries of 170 Ah each, not a 170-amp alternator. Its load-chart notes require deduction of hook and block weights and measure radius from the slewing centre. Headline lifting capacity therefore cannot serve as a load allowance at an arbitrary radius. LTM 1220-5.2, TD 211.00.US04.2013.