for boom movement, application of brakes, swaying of the load, and wind effects on the load and boom. The stability factor of mobile cranes allows for variables including: dynamic factors caused by the crane motion and the load e.g. The stability factor should be recorded on the crane load charts. The maximum load that the crane can lift before tipping occurs is calculated by applying a stability factor to work out when tipping may occur. Stability function of load charts When the load being lifted by the crane causes the crane to become unstable and overturn this condition is called tipping. The load charts may be complex and include many conditions that should be complied with to ensure the crane can safely lift a load. On some mobile cranes there may be more than one load chart for different boom and counterweight configurations. The load chart should be available in the crane cabin for the crane operator to verify the crane is not being overloaded. Load charts Load charts, also called rated capacity charts, identify what the crane is able to lift safely. The load indicator should be capable of displaying the mass of the suspended load at all times.
This indicator assists the crane operator to stay within the load chart and rated capacity of the crane. Load indicators measure and display the mass of the load being lifted. Load indicators Load indicators should be fitted to mobile cranes with a maximum rated capacity of more than 3 tonnes.
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