1.High lifting performance, wide application range 1)Boom max. lifting capacity/radius 135t/4.6m, boom max. load moment 722tm. 2)Fixed jib max. lifting capacity 20t. 1.2.Easy transport 1)Basic machine max. transport weight only 36.2t, max. transport width only 3m. 2)Transport without removing mast and winch. 2.3.Complete self assembly/disassembly system (Optional Function) 1)Use mast for assembly/disassembly of left/right track frame, superstructure counterweight and boom. 2)Counterweight raising mechanism to achieve assembly/disassembly of superstructure counterweight, work easily and quickly. 3)Car-body and track frame, boom and turntable, turntable and counterweight, all pin shafts use hydraulic power connection, easy for assembly and disassembly. 3.4.Four sets of supporting roller added in central crawler frame, reduced the wear to track shoes, and make more stable travel. 5.Improved design of operator’s cab support to reduce the impact to the cab during transport. 6.Fine motion control of main pump flow added to make more stable operation. 7.Control system is electronic proportional pump control variable system, simple, reliable, with good fine motion performance. 8.Hoist system uses electronic control + pressure cut-off type variable motor, to avoid the second decline and improve operational safety.