When Linden Comansa designed the LC2100 series of flat-top tower cranes, the goal was a crane that could operate on industrial, mining, infrastructure, and public works projects. Over the last few months, the crane manufacturer’s R&D team has worked to optimize various models of this series, and bring them to the tower-crane market.
Models 21LC335, 21LC550, and 21LC660 cranes, with a maximum load capacity of 20 tons, have been optimized to handle loads up to 22 tons. This improvement is mainly due to the fact that the trolley/hook assembly has been strengthened, and the hoist cable has been modified to the compact type with improved mechanical characteristics.
In the case of the 26-ton Model 21LC550, the maximum load capacity is increased to up to 27 tons. In addition, the load chart has been optimized. Similar to the 20-ton capacity cranes, these improvements are due to the fact that the 21LC550 now features a newer and lighter trolley/hook assembly than the previous model, and the hoist cable has been replaced with a compact and more resistant system.
In addition, for the 27-ton Model 21LC550, the replacement of the hoist cable has increased the drum capacity from 2,100 to 2,362 ft. in the standard 65 kW motor and optional 110 kW motor, and from 4,757 to 5,183 ft. in the optional 110 kW motor with a high-capacity Lebus drum.
When assessing the modifications to be implemented in the 21LC400 20-ton model, the R&D team saw the opportunity to greatly improve this crane. The result is a new model, the Model 21LC450 crane with 22 and 27-ton versions, versus the previous 13- and 20-ton Model 21LC400 crane.
To achieve such an improvement, not only have the hoist cable and trolley/hook assembly been modified, but the slewing part of the 21LC400 (turntable, slewing ring and cat-head) has also been replaced with a newly designed unit, which is common to the slewing part of the 21LC550.
To this end, not only is the crane strengthened, but modularity and interchangeability of elements between the new 21LC550 25t and 21LC450 are also facilitated. In addition, most jib, counter-jib and tower sections of the 21LC450 are identical to those of the 21LC400, which allows companies that own both models to swap sections as needed.
When compared with the 21LC400 18t, the 21LC450 20t has a maximum load capacity of 2.2 tons more than its predecessor, also with an improved load chart. For example, with its 164-ft. range, the 21LC450 can load up to 11 tons on the tip, while the maximum load capacity of the 21LC400 was less than 10 tons.
The maximum load capacity is increased in the 21LC450 25t by 8 tons, when compared with the 21LC400. This crane has a tip load capacity of 5,732 lbs. (6,305 lbs. with PowerLift, which comes as standard) and can load up to 27 tons, up to a reach of 67 ft. and with a 141-ft. jib-length.
In addition to the two versions of the 21LC400, the 21LC550 with a 12-ton maximum load capacity has also been retired from the catalogue, as currently Linden Comansa offers better alternatives to the market..