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Crane boom radius4/8/2023 The resulting increase in the radius can be substantial and is often sufficient to over pressurize the luff rams and to activate the overload protection (if fitted) which may prevent the crane moving into the required position. The operator may not get sufficient hook height to clear the base of the load over the tray body. In this configuration, only the outer boom can be raised. To handle a high load of near crane capacity, the inner boom must be vertical (or near to vertical), and the outer boom pointing down, with the hook above the centre of the load. You would need a crane rated at 6 tonne metres or better to do the job BUT it is important to consider the physical size of the load you are lifting. But with high or long slung loads, this calculation can lead to an embarrassment! If we say that we need to lift 2 tonne at 3 metres, we would look for a 6 tonne metre crane. Caution: Heavy (in close) lifts have a complication.
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