18 to 20 tonnes
The 21LC335, 21LC550 and 21LC660 cranes with a maximum load capacity of 18 tonnes have been optimised to load up to 20 tonnes. 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.
24 to 25 tonnes
In the case of the 24-tonne 21LC550, the maximum load capacity is increased to up to 25 tonnes. In addition, the load chart has been optimised. Similar to the 18-tonne 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, in the case of the 21LC550 25t, the replacement of the hoist cable has increased the drum capacity from 640 to 720 metres in the standard 65 kW motor and optional 110 kW motor, and from 1,450 to 1,580 metres in the optional 110 kW motor with a high-capacity Lebus drum.
New 21LC450 20t and 25t
When assessing the modifications to be implemented in the 21LC400 18t model, the R&D team of Linden Comansa saw the opportunity to greatly improve this crane. The result is a new model, the 21LC450 crane with 20 and 25-tonne versions, versus the previous 12 and 18-tonne 21LC400 crane.
To achieve such an obvious improvement, not only have the hoist cable and trolley/hook assembly been modified, but the slewing part of the 21LC400 has also been replaced (turntable, slewing ring and cat-head) with a newly designed unit, which is common to the slewing part of the 21LC550 25t. 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 two tonnes more than its predecessor, also with an improved load chart. For example, with its 50-metre range, the 21LC450 can load up to 10 tonnes on the tip, while the maximum load capacity of the 21LC400 was less than 9 tonnes.
The maximum load capacity is increased in the 21LC450 25t by 7 tonnes, when compared with the 21LC400. This crane has a tip load capacity of 2,600 kg (2,860 kg with PowerLift, which comes as standard) and can load up to 25 tonnes, up to a reach of 20.6 metres and with a 40 metre jib-length.
In addition to the two versions of the 21LC400, the 21LC550 with a 12-tonne maximum load capacity has also been retired from the catalogue, as currently Linden Comansa offers better alternatives to the market.