Patent ID: 7523835

Claim:
A method for determining a present value (L max ) of the capacity level of a hydraulic crane ( 1 ) provided with a lifting cylinder ( 8 ) and a processing unit ( 33 ), comprising the steps of detecting initiation of each new lifting cycle of the crane, registering a minimum value (V min ) of each lifting cycle, which represents lowest hydraulic pressure (p 1 ) on a piston side ( 8 a ) of the lifting cylinder or cylinder force (F c ) of the lifting cylinder during the lifting cycle, determining with the processing unit ( 33 ) for at least some lifting cycles, the present value (L max ) of the capacity level of the crane by taking into account a control value (V c ) corresponding to: a minimum value (V min ) registered for a previous lifting cycle, or lowest of the minimum value (V min ) registered for the previous lifting cycle and minimum value (V min ) registered for the present lifting cycle.