Comansa Upgrades Models 21LC660 And 21LC750

The design of new solutions for the 21LC1050 Flat-Top tower crane, launched two months ago (September 2018), allowed COMANSA’s R&D team to apply some of these developments to two of the manufacturer’s most successful cranes. Thus, models 21LC660 and 21LC750, mainly designed for large industrial projects, energy, mining and PPVC construction, improve their performance significantly.

The versions of 24, 36 and 48 tonnes (52,910, 79,360 and 105,820 lb) of both models have increased their maximum load capacity to 25, 37.5 and 50 tonnes (55,120, 82,670 and 110,230 lb). This improvement is achieved thanks to the use of a compacted wire rope, of smaller diameter, and an optimized design of the now lighter trolley-hook set. During the design of the 21LC1050, space restrictions at construction sites that exist in some countries due to regulation were taken into account. That is why a highly modular counterjib was created for such model, which allows up to six different configurations according to the jib length. As a novelty in terms of jib length, COMANSA now offers an optional 90 metre radius (295.3 ft), for special applications.

Models 21LC660 and 21LC750 (except the 20t version of 21LC660) now feature a new optional hoist mechanism (132 kW - 177 hp), which allows speeds of up to 300 metres per minute (984 ft/min). COMANSA also added the Effi-Plus system to the optional 110 kW hoist mechanisms (148 hp), available for all versions of such models. This system, which was already implemented in the other motors of both models, increases the hoist speed almost 15% with light loads. These two mechanisms greatly improve the productivity of the crane, especially when working at large heights. Both motors can have wire rope capacity of 720 or 1,570 metres (2,360 and 5,150 ft), which allows these cranes to work with heights under hook of up to 785 metres (2,575 ft).