Tadano’s new 250 tonne ‘class’ AC 5.250-2 All Terrain crane is now ready for production.
Shown as a prototype at Bauma last October, the new five axle crane features a seven section 70 metre main boom topped by lattice extensions of up to 34.9 metres with up to 40 degrees of offset. A 7.1 metre insert can also be added between the boom nose and full extension to achieve the maximum tip height of 116 metres. Alternatively, a 20.9 metre three section telescopic extension can be added with a tip height of 94 metres.
The maximum capacity without ‘special equipment’ is 175.9 tonnes at three metres radius. More impressively the crane can handle 14.5 tonnes on the fully extended main boom at a radius of up to 24 metres. It can also manage 11 tonnes at a 42 metre radius on a 47 metre boom. The crane can carry a three sheave hook block or a 5.8 metre heavy duty runner on board within 12 tonne axle loads, or up to 20 tonnes of counterweight where 16.5 tonne axle loadings are permitted.
The AC 5.250-2 can lift its full 80 tonnes of counterweight in three lifts: 49.6 tonnes with a full 360 degrees at a radius of up to 6.2 metres followed by two lifts of 15.2 tonnes. The variable automatically monitored outrigger system allows asymmetrically set ups of fully retracted to 25, 50, 75 percent and fully extended positions.
Project manager Peter Kleinhans said: “Thanks to the IC-1 Plus crane control system, which comes as standard, the available radius can even be significantly increased at certain slewing angles. In addition, the fact that the counterweight can be split into a large number of elements with none weighing more than 10 tonnes ensures maximum flexibility for transportation logistics. This means that relatively small trucks can be used for transportation when required by space conditions at a work site.”
Other features include a new patented ‘Surround View’ camera system which uses six cameras to show a computer assisted diagram of the maximum possible extension lengths for the outriggers at the crane’s current location, making it easier for operators to position the crane on site.
“With Tadano Surround View, crane operators can take a look at a display in the cab to know exactly how they need to position the crane at their work site in order to extend all outriggers sufficiently and ensure that they are using the required counterweight tailswing radius. This eliminates tedious and time consuming measurements and testing when looking for a location from which to operate the crane, making the latter ready for use faster,” said Kleinhans.
Another new feature is ‘TailGuard’ active reversing assist system which uses two ultrasonic sensors to monitor the area behind the crane when backing up and works regardless of ambient light conditions. The system shows the distance from stationary and moving objects on the cab’s display monitor, plays an acoustic warning before reaching an obstacle, and will stop the crane if there is a risk of collision. The backup assist system is automatically activated the moment the crane’s reverse gear is engaged.
Tadano’s ‘Lift Adjuster’ feature which measures the boom’s deflection and adjusts the lift cylinder to compensate for the change in radius caused by deflection to eliminate the risk of load swing on pick up, will be available on the crane from next year. Finally, a hill start assist system is standard.
Operator comfort features include locating all hydraulic components away from the superstructure cab, to reduce noise, while both cabs have been designed for safe, easy entry and exit. Power comes from a single EU Stage V diesel with Eco Mode, auto start stop and is HVO fuel ready.
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