Link-Belt ATC 3250
07 May 2008
Link-Belt is keeping a mystery until the ConExpo show opens information about two new telescopic cranes that the company will unveil. In the all terrain category, the company from Lexington, KY will show off its 250-ton (220-metric ton) ATC-3250 all terrain crane that was first introduced in the fall of 2006.
The ATC-3250 is equipped with a 43.3-223.1-ft (13.2-68.0 meter), full power, seven-section, latching boom. The sections extend independently by means of one double acting, single stage hydraulic cylinder. Four pinned positions of 0%, 46%, 92%, and 100% on each section provide thirty-eight extend combinations for superior capacities when varying the extensions of the telescoping sections.
A 17.7 to 43.3-feet (5.4-13.2 meter) two-piece, lattice fly and four lattice fly extensions are available as options for additional reach. Each of the extensions is 19.7 feet (6.0 meters) and extends the fly length to 63 feet (19.2 meters), 82.7 feet (25.2 meters), 102.4 feet (31.2 meters), and 122.1 feet (37.2 meters). The 43.3-foot (13.2 meter) attachment with all four lattice extensions used in combination with the main boom reaches a maximum tip height of 358 feet (109.1 meters).
The galvaneal cab with acoustical insulation has a tilting capsule for high boom angle lifting.
Outrigger controls are also located in the operator's cab. Two electric-over-hydraulic, dual-axis levers with fine metering capability control the winches, boom hoist, and swing. Heating and air conditioning, a cabin pre-heater with a pre-settable timer, AM/FM stereo with CD i player, power front window, floodlights, and an integrated cab walk are standard.
Axial piston, constant displacement motors with final layer and third wrap indicators drive the main (front) and auxiliary / (rear) winches. The main and auxiliary grooved hoist drums contain 1,148 ft (350 m) of 0.83 in (21 mm) wire rope.
Maximum line pull for each winch is a powerful 24,504 lbs (11 114.8 kg) and the maximum line speed is 508 ft/min (154.7 m/min).
A 530 horsepower (390 kW) Mercedes-Benz engine and ZFAS-Tronicautomated, 16-I speed manual transmission deliver a top speed of 52.8 mph (85.0 km/hr). With five axles, the ATC-3250 features a 10x8x8 drive/steer configuration. This combination of power and traction allows the 3250 to tackle 61% grades. Also, a third axle lift system is incorporated that provides more inter-bridge spacing to comply with certain transportation requirements found throughout North America.
The primary steering, controlled by turning the steering wheel, varies with the speed of the crane. Below 15.5 mph (25 km/h), axles 1, 2, 4, and 5 steer in combination. As the speed of the crane increases, axle 4 and then axle 5 sequentially return to center until axle 1 and 2 become the only two axles steered. There are also five additional steering modes including independent front, combination, crab, independent rear, and a temporary crab steering mode.
The carrierhasothermobility esa conveniences like cruise control, engine compression brake, and a driveline intarder. The intarder, produced by ZF, is a hydrodynamic driveline brake that is integral to the transmission.