... operation valve, etc. One drum for lifting purpose, another drum for OPEN/CLOSE of the Grab.Work load300Ton for each drumSpeed30m/min @300Ton ... (2nd layer), 60m/min @150Ton (2nd layer)Drum Capacity for CableL1000m x 4pcs ( total 2 layers)Cable spesificationDia. ... disk brakeBand Brake holding load400Ton for each drum (2nd layer, static)Disk Brake holding load100Ton for lifting drum (2nd layer, static) ...