Description
Twin Disc DD-6557SC Transmission Gearbox
The Twin Disc DD-6557SC (also referenced as MG-6557SC) is a heavy-duty marine transmission gearbox featuring a straight/standard-case design, integrated Power Take-Off (PTO) capabilities, and typical dry weights around 966 lbs.
Key Technical Specifications Twin disc dd 6557sc transmission gearbox for sale
- Configuration: Straight output case (SC)
- Approximate Dry Weight: 966 lbs (438 kg)
- Available Ratios: Commonly found in configurations like 1.74:1, 1.75:1, and 2.03:1
- Physical Dimensions: Approximately 32″ Length x 28″ Width x 35″ Height
- Shift and Control: Electric shifting with mechanical backup options and electric/mechanical trolling valve provisions
- Options: Equipped with PTO capability
Applications and Support
- Designed for commercial and heavy-duty marine inboard diesel engine setups.
- Parts, overhauls, and service support can be coordinated globally through authorized Twin Disc distributor networks.
The Twin Disc DD-6557SC (MG-6557SC) marine transmission was manufactured with the following complete range of nominal gear reduction ratios
Standard Factory Ratios
- 1.07 : 1
- 1.30 : 1
- 1.50 : 1
- 1.66 : 1
- 1.74 : 1(Commonly found on MTU 12V-2000 builds)
- 1.97 : 1
- 2.04 : 1(Often cataloged as 2.03:1 depending on the exact gear-tooth count build)
- 2.45 : 1
- 2.82 : 1
- 2.93 : 1
Power Ratings (Maximum Input Capability)
- Intermediate Duty: Maximum 867 kW (1,163 hp) @ 2,100 RPM.
- Application Profiles: It is heavily utilized on commercial semi-displacement hulls, medium-speed vessels, or high-output installations like commercial sportfish charter boats, lobster/crab boats, and passenger ferries
