... 3 chains 3. ISO9001 Certified Manufacturer PU200 pontoon undercarriage for amphibious excavator, 3 chains track, fit to 18-20ton ... of Undercarriage, mm1820Pontoon SizeWeight of Pontoon, kg8000Length of Pontoon, mm8400Width of Pontoon, mm1700Height of Pontoon, mm1700Number of Compartments3DOOSAN hydraulic motors, ... √Steel Materails of Track Rollers√ PU200 Pontoon Chassis for amphibious excavator