... mmOperating SystemHydraulic Electronic Control operationSpare PartsDiesel tools, Oil Seal, Welding machine etcProduct FeatureFor sand production ... . An integral hydraulic system includes hydraulic oil tanks, hydraulic pump, hydraulic valve manifold, solenoid valve, hydraulic ... as : cutter suction dredger , bucket chain dredger , underwater pump dredger , self- propelled dredger , gold panning dredger , ...