... : colored steel shingles Functions:1) For sand dredging , river maintenance,etc2) Reliable hydraulic system3) Fresh water engine cooling ... operate and maintain11) Transport by road , rail or sea12) The dredger is mainly used in the coastal , river, channel , reservoir , to ... the quality of the main parts: Diesel engines, generators, gear boxes, dredge pumps, Hydraulic system.1) 12 months manufacturing ...