Recently, marine power system equipments (including 2 sets of controllable pitch propellers, 2 units of propulsion gearboxes and tunnel thruster) and 2 units of dredger pump gearboxes, manufactured by Nanjing High Accurate Marine Equipment Co., Ltd (鈥淣GC Marine Company鈥), a wholly subsidiary of Nanjing High Accurate Transmission Equipment Manufacturing Co., Ltd (鈥淣GC鈥) were installed in 8000m3 鈥淴inghangjun 2鈥 hopper dredger and passed the sea trial. After a series of tests, like over load test, engine-propeller combined adjusting test, navigation speed test, dredging test, it is proved NGC products were running at good condition. The clients and surveyor gave very high opinions to our products.The dredging pump gearbox of 鈥淴inghangjun 2鈥 is typed as NB1050, which is designed with welded vertical offset arrangement (input side is on top, output side is in bottom) and double speed, therefore, the switch from dredging to rain bowing condition can be done via the shifter. The gearbox is equipped with cooler and lubrication system. The switch of different conditions (different ratios) can be done by hand or remote control. The output power of low speed is 1100Kw, and the output speed is 217r/min, which is suitable for dredging; and the output power of high speed is 3300Kw, and the output speed is 337r/min, which is suitable for rain bowing. The diameter of CP propeller is 4370mm, the diameter of middle shaft is 280mm, and the shaft diameter of propeller is 360mm, which is able to satisfy the local control, ECR control and wheel house control, with angle locking function to each ...