Wolffkran has introduced a replacement model for the WOLFF 6015 clear tower crane. The new WOLFF 6020 clear flat-top tower crane has been completely overhauled to meet the demands of complex construction sites. Major improvements include an increased tip load capacity and numerous design details integrated on the WOLFF clear crane models. The unit will be available to customers in September 2017.
Two versions of the crane will be offered — the 6-ton WOLFF 6020.6 clear and the 8-ton WOLFF 6020.8 clear — with three different tower connections per version. “Compared to its predecessor, the 6-ton version can lift 2 tons instead of 1.5 tons at the tip at a 60-meter jib radius, while the tip load capacity of the 8-ton version was increased from 1.5 tons to 1.8 tons,” said Gerd Tiedtke, product manager at Wolffkran. Like the WOLFF 6015 clear, both versions are designed for a pure two-fall operation.
The new 28kw hoist winch Hw 628.1 FU on the WOLFF 6020.6 clear allows for even faster working times with partial load speeds of up to 108 m/min. The 8-ton version relies on the tried and tested 45 kW hoist winch Hw 845 FU.
Wolffkran engineers redesigned the trolley by replacing the rollers with wheel flanges used by rollers without wheel flanges and a new guide roller on the jib, which optimizes the run of the trolley. The connection of the lower belt of jib has also been redesigned to optimize the transfer of forces on the jib. This allows for the use of smaller bolts, which makes the assembly easier.
The new WOLFF 6020 clear also offers customers more flexibility. Since counterweights are no longer included as standard in the basic crane package or the jib extensions, crane owners can use counterweight blocks from existing WOLFF cranes, or buy these separately as required. In terms of variability, the 6020 clear is available with three different tower connections. It can therefore be connected to the narrow UV 15 tower system (external dimension of 1.5 m × 1.5 m) as well as to the wider towers TFS 20 and UV 20 (both 2 m × 2 m).
“Inspired by customer feedback, we have fitted the counter jib with transport aids in the form a special support structure to securely hold up to three jib sections on the counter jib during transport,” Tiedtke said. Further, the counter jib has been fitted with new railings that are suitable for attaching safety harnesses thus improving the safety for technicians working on the counter jib.
The WOLFF 6020 clear now also features the support beams for the easy positioning of the bracing rods that were introduced to the clear models several years ago and considerably facilitate assembly of the counter jib. A maintenance crane with a lifting capacity of up to one ton is optionally available to support maintenance work on the hoisting drive unit.
Compared to the WOLFF 6015 clear, the WOLFF 6020 clear features even more galvanized parts, such as railings, platforms and covers, as well as specially coated bolts to prevent corrosion. The modern slip ring system – a long standing standard in WOLFF cranes – at the transition point between the tower and the jib permits the trouble-free transmission of electrical signals.
“The electronic overload protection with WOLFF Boost, the latest generation of frequency inverters in the hoist drive, the anti-collision interface, the hoisting gear with automatic power reduction as well as the telecommunication system WOLFF Link are technical features that can only be sourced together from Wolffkran,” he added.
