Wolffkran is adding a new model to its Wolff Pack portfolio of tower cranes: the WOLFF 6523 Clear. The new 224 tonne class flat top tower crane is based on Wolffkran’s 6031 Clear, one of the company’s best-selling cranes, but comes with a newly designed and patented jib and, if specified, the new WOLFF High-Speed-Positioning-System (HiSPS) – which premiered at Bauma 2022 .
For optimised assembly and operation the redesigned jib now has bottom chord connections that use bolts and the jib sections, including the rope swivel traverse, are mounted on the front with a mandrel and wedge connection. In the top chord the pins are now inserted into the pear-shaped holes to enable easier assembly without a hammer, says Wolffkran.
Sensors on the trolley and hook block, together with a control unit, enable the load to be transported free of load sway by detecting the rope’s movements and automatically adjusting the movement and speed of the crane to it.
Since the trolley adjusts its position automatically via the hook block not only is the wind impact eliminated but it also prevents a diagonal pull on the load making pushing the load by hand and pulling the hook manually easier and safer, Wolffkran claims.
“This new development also provides advantages during crane operation,” said Dr. Mohamed Abouelezz, head of product management and business development at Wolffkran. “Thanks to the smooth jib transitions, trolleys equipped with lateral guide rollers run more steadily and smoothly along the jib. This makes it easier to finely position the load, even without using the High-Speed-Positioning-System.”
The new WOLFF 6523 Clear is equipped with a 45 kw hoist winch. It lifts a maximum of 8.5 tonnes in two-fall operation with a jib length of 30 metres and 12.5 tonnes in four-fall operation with a reach of 21.5 metres. At a maximum jib length of 65 metres, the WOLFF 6523 Clear has a tip load capacity of 2.3 tonnes in normal operation and 2.5 tonnes with the activated WOLFF Boost function. The jib can be extended from 30 to 65 metres in 2.5-metre increments.
The crane comes with a combined UV 20/TV 20 tower connection which allows it to be mounted freestanding on a 2.0 x 2.0 metre tower of up to 69 metres. Using a 2.9 x 2.9 metre tower it can operate at 106 metres without tie-ins. The crane can be transported on four trucks or in five containers. Featuring a tried-and-tested design, the cabin and switch cabinet are located on the driver’s cab station, which is connected to the rotating frame, making assembly easy.
The WOLFF 6523 Clear will primarily be sold in Germany (D), Austria (A), and Switzerland (CH) – although a version with a maximum payload of 10.5 tonnes in two-fall operation as well as an US version are being planned. The WOLFF 6523 Clear can also be specified with plastic fibre rope to replace the steel rope 1:1.
