... manufacturing and supplying kinds of dredging equipment, i.e. amphibious excavators, swamp excavators, swamp undercarriages, long reach boom ... of upperstructure and undercarriage.1. PU200 Pontoon Chassis for amphibious excavators2. Doosan travel motor, 3 chains 3. ISO9001 ... Certified Manufacturer PU200 pontoon undercarriage for amphibious excavator, 3 chains track, fit to 18-20ton ...