ZX hoists mounted on a double girder trolley are available with a single scrolled hoist drum in all capacities up to 32 tonnes and in all capacities up to 80 tonnes with a double scrolled hoist drum.
A double scrolled hoist drum costs more than a single scroll drum but provides true vertical lift and equal trolley wheel loads. The equal wheel loads reduce the cost and size of crane girders such that the overall crane solution with a double scrolled hoist is the most economic at larger capacities and the true vertical lift is a big advantage in some applications. Hoists in this range are on the ZX6, ZX8 or ZX10 chassis with either 2, 4, 6, 8, 12 and 16 falls of rope and multiple brake/motor/gearbox/drum diameter combinations to provide a very large number of speed, duty and height of lift options.