Liebherr Delivers MK 140 Plus, Its 1,000th Mobile Construction Crane, To Hanyš-Jerábnické In The Czech Republic
An 8-tonne (8.8-U.S.-ton) Liebherr MK 140 recently became the 1,000th mobile tower crane the manufacturer has delivered. Already the most powerful in the MK series, the crane included an optional 10% load increase system that upgraded its model name to MK 140 Plus.
The new owner is Hanyš-Jeřábnické práce, s.r.o., the largest crane service provider in the Czech Republic, which numbers a MK 110 among the more than 90 Liebherr cranes in its fleet. Hanyš plans to use the MK 140 Plus to install roof air conditioners and roof terrace pools.
“I’m confident that the crane will bring in more orders and make our work even more efficient,” says company founder and owner Rostislav Hanyš. “When it comes to working at heights, this crane takes up much less space than any conventional type. If we’re in a city centre, we only have to have enough space for the crane’s extended outriggers and we can reach heights of up 56 metres (184 feet) over buildings. It’s one of the great things about working with this crane.”
Quick Jobs In Confined Areas
“MK-series cranes are often called upon when short-term lifting work is required and conventional mobile cranes aren’t an option because of the space they need to handle projecting edges of angular buildings,” says Jan Hloušek, the head of tower cranes customer service at Liebherr-Stavební stroje CZ. “The crane is perfect for jobs in urban areas and work on tall structures, such as steel framed warehouses.”
The five-axle MK 140 and its vertical tower can be set up right next to a building, taking up little space on the worksite. It can be transported, assembled, and operated by just one person in taxi crane fashion. Liebherr says that the MK 140 can travel to and perform tasks at several construction sites in a single day.
“The MK 140’s sensitive drives and intelligent assistance systems make operation safe and precise,” says crane operator Pavel Dobrý. “It’s operated by winches instead of hydraulics—a reliable solution in my opinion.” Dobrý also touts the crane’s smooth handling and comfortable operator’s cab, which can climb to the top of the tower or any vantage height along the way.
Hanyš-Jeřábnické’s MK 140 Plus came with all options, including differential locks between both front and back axles, an extra hook camera, an extended jib, more ballast, heating and air conditioning, a drinks cooler, a heated seat, and a high-resolution colour display. The privately held company currently owns more than 90 Liebherr cranes and has been in operation for 30 years.
Two VarioJib Modes
Alone among the MK series, the heaviest model MK 140 has a three-section, telescopic tower with solid-wall construction. Its specifications depend on the VarioJib mode the operator selects for the crane. The high-capacity trolley mode yields a maximum hoist height of 39.9 metres (131 feet) and lets the near-horizontal jib slew above or beneath obstacles. The luffing mode allows the crane to raise lighter loads by elevating its jib. This mode affords a hook height of up to 94.4 m (310 ft) in the maximum luffed position of 70 degrees.
In trolley mode, the crane can hoist up to 8 t. It can reach a radius of 58.5 m (192 ft), at the end of which it can lift 1.9 t (2.1 U.S. t). Luffing mode allows for a maximum radius of 65 m (213 ft) with additional lattice jib heads, along with a 1.7-t (1.9-U.S.-t) lift capacity at the tip. The operator can switch between operating modes in minutes, according to the manufacturer, and the hook camera can be used on either the trolley or the jib head. Liebherr offers extra ballast weight for special applications.
The MK 140’s travel motor, a 536-horsepower (400-kilowatt) six-cylinder Liebherr diesel engine, can propel it down the road at up to 50 mph (80.5 km/h). The crane weighs 60 t (66 U.S. t) and has a transport length of 16 m (52.5 ft) with its 60-m (197-ft) jib on board.
At the worksite, the operator can choose among five steering programs and call upon the MK 140’s active rear axle steering to manoeuvre into position even where space is limited. The crane’s outriggers can be extended only on one side for 270-degree, half-sided support when there’s not enough room for a standard, two-sided deployment.
During operation, the crane uses site power or an onboard diesel generator to drive its tower and jib. An optional radio remote control lets the user ballast and operate the crane from any position. The two-line MK 140 adheres to the European EN 14439 safety standard for tower cranes. It can remain erected on site for multi-day jobs if allowed to weathervane.
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Source: Liebherr