Single-rope self dumping crane grab for the loading and transportation of bulk material and loose earth by crane. Automatic grabbing with the closing and opening mechanism of the clamshell bucket. The opened clamshell bucket is lowered onto the loading point, where its shells close and take up the bulk material automatically when lifted. When lowered again the shells are opened by the automatic mechanism and emptied. Simple, rugged construction, service-proven with numerous satisfied customers. High operational reliability and safety and easy to operate.