Comansa’s 21LC550 is evolving into two new flat-top crane models.
The 21LC series now includes the 21LC600 and the 21LC650 models, which deliver 20 and 25 tonne maximum load, and may be assembled with ranges of 30 to 80 metres with configurations every 5 metres. This allows a maximum point load of up to 4.95 tonnes. Both models incorporate an optional boom configuration that allows the total range to be extended to 85 metres at the tip.
Compared to the 21LC550 flat-top crane, load capacities are on average 16 per cent higher for the 21LC600 and 23 per cent higher for the 21LC650.
The new cranes have a shorter, modular counter-jib, ranging from 24.4 to 16.4 metres and have up to five possible configurations. The counter-jib concept was previously included in the 21LC750, 21LC1050 and 21LC1400 models and offers greater adaptation to the work configuration in reduced spaces.
Another new feature is the improved access to the turntable and the rotating part. The cathead has been redesigned to facilitate the passage of lifting cables, including a welded ladder that allows access to the highest part without the need for the cab platform. Access to the cab platform is now direct via the turntable thanks to the folding ladder, which helps to prevent falls while working on the upper level and also improves transportability.
As a standard feature, both crane models offer a double trolley (DT) system with automatic changeover, and incorporate the optional availability of single trolley (ST), which simplifies maintenance work, while increasing load capacity in short boom lengths.
The height, which is self-supporting with a built-in base, can reach up to 85.8 metres. As well, the tower sections are 2.5 square metres for both models.
Comansa has also introduced a new climbing cage incorporated on the new flat-top cranes.
The J3A-11, which follows the concept of the J3-20, delivers greater length and distance between rollers, a savings in scale recovery time, thanks to the auxiliary hoist included, which can also be transported in standard containers or trucks.
For the lift engines, the standard for the 20-tonne versions is 50 kW, while for the 25-tonne version it is 65 kW.
The 110-kW engine is optional for both versions, with a speed of up to 290 metres per minute and maximum capacities of 1,570 metres of cable.
The Effi-Plus technology, fitted as standard, significantly increases lifting and lowering speeds for light loads, shortening working cycles without increasing power or consumption.
Comansa cranes’ modularity allows certain boom sections to be interchangeable within the 21LC-crane series, which enables rental companies to reduce their stock, optimizing their investments, as they can order these new cranes with a shorter boom length if they have previous cranes of the same series in stock.
Both models come standard with the CUBE cab in its L version, with the XL available as an option. The CUBE’s design is safer, more comfortable and provides operators with total visibility of the load and workspace, so they can carry out operations more easily, thanks to the digital control technology incorporated.
The 21LC600 and 21LC650 Flat-Top tower cranes can be used for the construction of residential and commercial buildings, as well as power plants, mining, bridges and other high-commitment infrastructure.