The current Liebherr MK series now available in the United States includes the MK 73-3.1E, MK 88-4.1E, MK 120-5.1E and MK 140-5.1E models. All are hybrid-powered and can operate silently when connected to site power, an increasingly important advantage for sustainable, low-impact construction in populated areas. and infrastructure upgrades. Their largest model, the MK 140-5.1, has a reach of more than 200 feet and a hook height of up to 309 feet, and it’ s fully operational in less than 30 minutes.
In New England, SL Chasse Steel, based in Hudson, New Hampshire, took delivery of its own Liebherr MK 88-4.1 to serve mid-rise projects in space-constrained areas of the state and in Massachusetts.
“ The MK 88-4.1 has exceptional versatility and rapid deployment capabilities,” said Stephen L. Chasse, president of SL Chasse Steel.“ The key advantage is its ability to be positioned close to a building and operate in tight spaces where a standard mobile crane cannot.”
That capability is especially valuable for the company’ s work on four- to six-story timber-frame residential buildings using prefabricated panels where every inch of street space counts.
SL Chasse’ s MK 88-4.1 features a 99-foot standard hook height, 193-foot maximum hook height and a 4,850- pound capacity at a 147-foot radius. It’ s powered by Liebherr’ s hybrid system, allowing electric or diesel operation, and offers the same 30-minute setup advantage that’ s quickly redefining what’ s possible on urban sites.
Long History Liebherr’ s history with mobile construction cranes dates back over half a century. The concept first emerged in 1961, when the company introduced fasterecting cranes of the former KA series mounted on a truck chassis, a combination that laid the groundwork for today’ s MK line.
The current MK series now available in the United States includes the MK 73-3.1E, MK 88-4.1E, MK 120-5.1E and MK 140-5.1E models. All are hybrid-powered and can operate silently when connected to site power, an increasingly important advantage for sustainable, low-impact construction in populated areas.
The MK cranes are purposebuilt for urban environments, where narrow streets, congested sites and strict noise limits challenge conventional lifting equipment. Because
8 January 9, 2026 www. contractorshotline. com