The new Tadano AC 5.250L-2 all terrain crane, which will be introduced at bauma 2025, is equipped with a 79-m-long main boom. The maximum system length of 109 m makes this compact, five-axle machine an ideal choice for urban applications, for example for lifting air conditioning units over obstructions onto tall buildings. It is also suitable for the assembly of large tower cranes. All available main boom extensions from 5.8 to 30 m are self-erecting.
“Our AC 5.250L-2 is also top of the class when it comes to load moment, which at up to 736 mt is one of the best on the market,” said Tadano project manager Peter Kleinhans. This high load moment is achieved with a working radius of 7 m, a 13.5-m-long main boom and a load weight of 105.2 t. In addition, Tadano offers an optional heavy-lift attachment for even heavier loads up to 138.7 t on the short boom with additional sheaves.
Economical use as a taxi crane
Like the basic AC 5.250-2 model, the ‘main boom long version’ also features excellent transport configurations. The crane with 10 x 6 drive can be moved on cost-effective 16-in steel wheels on public roads while complying with the 12-t axle load limit with a considerable amount of equipment, including a 32-t Vario hook block and outriggers with a total weight of less than 60 t, transport brackets for extensions, and up to 250 kg of equipment in the rear box.
In compliance with the 16.5-t axle load limit with a total weight of exactly 82.5 t, the AC 5.250L-2 can even be driven on public roads with a 10 x 8 drive on 16-in steel wheels. It can not only carry a 32-t hook block, outriggers and a 12-m extension including transport brackets, but also 20 t of counterweight and up to 500 kg of equipment in the rear box.
The AC 5.250L-2 can pick up its maximum counterweight of 80 t in three lifts: 49.6 t with a radius of up to 6.8 m at a full radius of 360° and two 15.2-t with a radius of up to 13 m, divided into 10 and 5.2 t for hanging on the right and left of the basic package. If required, the counterweight can be divided into smaller pieces. For example, the 5.5-t base plate can be picked up from a distance of up to 23 m in a full radius.
“Thanks to the standard IC-1 Plus crane control system, the possible radius can be increased considerably in certain areas of the slewing angle,” said Mr Kleinhans. Maximum flexibility in transport logistics is also ensured by the division of the counterweight, with no element weighing more than 10 t. This means that smaller trucks can be scheduled for transportation if space conditions on the construction site require it.
IC-1 Plus and Surround View systems
The IC-1 Plus crane control system determines the maximum load capacity of the crane in real time for each boom position depending on the slewing angle of the superstructure. As such, the crane can always use the maximum available capacity – especially when lifting over the outriggers. These outriggers can be extended asymmetrically in five positions of 0, 25, 50, 75 and 100 percent.
The Surround View camera system is also available as an option for the AC 5.250L-2, making it easier for the operator to optimally position the crane on the construction site. This system uses six cameras to display the maximum possible extension widths of the outriggers at the crane’s current position in a computer-aided display.
“With Tadano Surround View, the crane operator can see on a display in the cab exactly how he needs to position the crane on the construction site in order to extend all outriggers sufficiently and ensure the required slewing radius. This eliminates the need for tedious and time-consuming measuring and trial-and-error when searching for a location, so that the crane is ready for use more quickly,” explained Mr Kleinhans. The system also helps to better recognise pedestrians and cyclists on the way to the construction site when turning.
Comfortable workplace
All noise-emitting hydraulic components are positioned away from the upper cabin to ensure it is quiet. The spacious cabs offer a high level of operating comfort and pleasant working conditions. Safety is guaranteed by well-placed access steps, attachment points for the driver’s personal safety equipment and a step that can be extended from the undercarriage for safe and convenient entry and exit to the upper cab.
The optional pendant light and a load view camera enhance greater safety during operation. These can be mounted alternately on the boom head and on the extensions so that one system can be used for all configurations. When lifting over interfering edges with an extension, the repeater, which is also available, is recommended for mounting on the boom head to enable a wireless connection to the camera in such cases.
The diesel engine with 530 hp output and a maximum torque of 2,600 Nm provides decent propulsion and strong lifting performance. It is HVO compliant, meeting the current EU Stage V requirements. Thanks to Eco Mode, the engine only delivers as much power as the crane needs at any given time. The corresponding calculations are made via the IC-1 crane control system, which also includes a fuel-saving start/stop function. This switches off the crane engine at the touch of a button without deactivating the control software – and the hill start assist, which is fitted as standard, ensures stress-free driving when starting off and manoeuvring on inclines.
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