Manitowoc has upgraded its 275-ton (250-tonne) capacity 999 lattice boom mobile crane, renaming it the MLC250.

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Key specifications largely remain unchanged, with the new MLC250 using the same #82 boom sections that provide a maximum boom length of 290 ft (88.4 m). However, a key change is the switch to open-loop hydraulics, versus the closed-loop system on the 999.


Now, every main function (aside from swing) is powered by the same two main pumps, reducing parasitic load. With fewer pumps constantly requiring power, operators will see a more robust overall hydraulic performance, along with faster engine starting in cold weather. 


Several major changes have been made to the carbody. The carbody counterweights now double as part of the upper deck and serve as a more stable walking platform, replacing the 999’s walkways that pivoted over the counterweights. 


“The model 999 has been a firm favourite with contractors in the heavy construction and energy sectors for 20 years, providing enough reach and capacity to tackle virtually any job,” said Brennan Seeliger, product manager at Manitowoc. “Feedback received through our ‘voice of the customer’ new product development process showed that users were still satisfied with its performance, but there were areas that could be enhanced to bring it in line with our newer crawlers. Following a wide range of updates, it seemed only logical to move the 999 into the MLC line-up, which shares many of those same features.”