Hot Sale Nico DD-6557DC, 3.93:1 , Transmission / Gearbox / Twin Disc Only US$ 32.500.00. A heavy-duty, deep-case marine gearbox designed for high-performance diesel propulsion systems. This transmission is manufactured through a global partnership between Twin Disc and Hitachi Nico Transmission.
Nico DD-6557DC, 3.93:1 , Transmission / Gearbox / Twin Disc Specifications
- Model Designation: DD-6557DC (Deep Case variant of the MG-6557 series)
- Gear Reduction Ratio: 3.93:1
- Housing Size: SAE Bell Housing #0 (Alloy housing construction)
- Dry Weight: 512 kg (1,126 lbs)
- Oil Capacity: 18 Liters
- Minimum Oil Pressure (Cruising): 2.5 MPa
- Shift Mechanism: Electric shift control equipped with a mechanical backup valve
Standard Equipment & Engineering Features
- Clutch Design: Hydraulically actuated, wet multiple-disc oil-lubricated clutches.
- Equal Power Rating: Same torque capacity and reduction ratios through both forward and reverse directions.
- Input Couplings: Compatible with 14-inch or 18-inch torsional input couplings.
- Filtration System: Standard integrated oil strainer and oil filter assembly.
- Cooling System: Integral raw water heat exchanger mounted directly to the transmission housing.
Performance & Compatibility Estimates
Based on standard Twin Disc MG-6557 series documentation, the baseline transmission line is rated to handle power scales ranging from 533 to 1,342 kW (715 to 1,800 hp) depending on the service duty cycle:
- Continuous Duty: Optimized for commercial vessels operating around 1,600–1,800 RPM.
- Pleasure Craft / Light Duty: Rated up to 2,100 RPM maximum input speed
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