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MTW to debut powerful AT

12 April 2010
Manitowoc is to present the ‘world’s most powerful six-axle all terrain crane’ at Bauma 2010, the Grove GMK6400.
The 400t capacity all terrain has a maximum main boom length of 60m and a maximum tip height of 136m.
The Grove GMK6400 all terrain crane can be equipped with a mega wing lift capacity-enhancing attachment, which Manitowoc said allows the crane to offer ‘significant lift capabilities’, which are up to 35% stronger than similar cranes.
The mega wing lift attachment provides extra support to the boom. It is equipped with a self-rigging system that mounts on the chassis and connects to the boom. When the boom is in working position, the mega wing lift attachment extends laterally to stiffen the boom.
Grove’s GMK6400 all terrain crane operates using a single engine for both travelling and crane operations, which reduces weight and improves fuel economy. This is a Mercedes OM 502 Tier 4i eight-cylinder engine that produces 405kW at 1,800rpm, powering a ZF AS Tronic 12 transmission.


MTW to debut powerful AT


“Our engineers discovered that smaller engines, which are typically used to power lift operations in the superstructure, use more fuel when they operate at the higher RPM needed for actions like slewing, telescoping and luffing,” said Neil Hollingshead, Manitowoc’s global product director for all terrain and rough terrain cranes.
“Using a larger, single engine operating at lower RPM, as featured on the GMK6400, is actually more fuel efficient.”
This is coupled with a MegaDrive hybrid drive system for travelling at lower speeds. This gives the crane more efficient fuel consumption, a lower centre of gravity and longer lasting parts, Manitowoc said. MegaDrive powers the crane when it is accelerating to speeds of approximately 20km/h, and then the conventional drive takes over. MegaDrive activates when decelerating below a similar speed.
Manitowoc added MegaDrive gives better traction on poor surfaces for easier on-site manoeuvre, especially when combined with Grove’s Megatrak independent suspension system.
“We’ve concentrated on all aspects of owning and operating cranes, particularly the issues our customers care about, including fuel efficiency, versatility, reach and productivity,” said Hollingshead.
“Above all, we focussed on strength. Customer feedback told us not to compromise the load chart for a few extra metres of boom. We followed that advice, and when customers see the charts, there are clear advantages over other cranes in this class. This crane is a new design and we believe it sets new standards in heavy lifting for six-axle all terrain cranes.”



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