QY50B Hydraulic mobile crane Product Description With 4 axle specialties chassis, Steyr WD615.67A engine conforms to Euro II, 5 section type "U" main boom (40.1m), 2 section boom jib (15.1m), dual independent winch system, swing system with free-sliding, air conditioners for drive-room and crane carrier, hydraulic oil radiator, PAT system, mechanical control, equip 5th outrigger, payload 50 ton.