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. The 21LC660 and 21LC750 are mainly designed for large industrial projects, energy, mining and PPVC construction.
The versions of 24, 36 and 48t (52,910, 79,360 and 105,820 lb) of both models have increased their maximum load capacity to 25, 37.5 and 50t (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.
“Such change does not only increase the maximum load capacity of the crane, but also improves the loads in all radius, including the jib-end load,” said Comansa.
The highly modular counterjib that was created for the 21LC1050 has also been brought over to these two cranes. It allows for up to six different configurations according to jib length. Comansa said it improves the counterjib radius of both models when they are erected with reduced jib-lengths. “Thus, when the 21LC750 crane is erected with a 50m jib (164ft), the counterjib radius is 25m instead of 31m, of the previous design,” said the manufacturer.
Comansa now offers an optional 90 m radius (295.3 ft), for special applications. This option is available for the 21LC660 and 21LC750 models. These models (except the 20t version of 21LC660) now feature a new optional hoist mechanism (132 kW/177 hp), which allows speeds of up to 300m per minute. Comansa also added the Effi-Plus system to the optional 110kW hoist mechanisms (148hp), available for all versions of such models.
To simplify and unify the range of tower sections, the 21LC750 now has the D36B as standard section. This mast is the same as that of the 21LC1050 Flat-Top and the LCL700 luffing-jib crane, and is fully compatible with the D36 mast section, which was the standard for the 21LC750 and will now be discontinued.
The 21LC660 and the 21LC750 have worked in projects in different countries such as Germany, South Korea, Canada, Angola, Singapore, Sweden, Qatar, Australia, Argentina, Hong Kong and Ivory Coast.
They are now available worldwide and are shipped with the XL-size CUBE cab as standard.