Manitowoc MLC250 lattice boom crawler crane replaces the 999 in the 275-ton class. Updates include a switch to open-loop hydraulics from the closed-loop system on the 999. Every main function (aside from swing) is powered by the same two main pumps, reducing parasitic load.
The engine remains the same, the Cummins QSL9, but it is a more efficient version delivering 340 horsepower at 2,100 rpm.
Major changes to the carbody include counterweights that 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. Taking inspiration from the MLC100 and MLC150, the MLC250 has fabricated steel component enclosures with swing-open doors (rather than the fiberglass gullwing doors of its predecessor), which improves compartment access and mobility around the crane. The upper platform is reached via new steps mounted onto the undercarriage.
A wider standard cab has an optional 20 degrees of hydraulic tilt. The legacy EPICsystem is replaced with the Manitowoc Crane Control System (CCS). The CCS features a full-color graphic display and dual-axis electronic joysticks.
Key specifications largely remain unchanged, with the MLC250 using the same #82 boom sections that provide a max boom length of 290 feet.