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The MG-5085 Series marine transmission is designed for marine propulsion applications requiring compact installation, dependable hydraulic clutch operation, and multiple reduction-ratio options. Available in MG-5085 SC shallow-case and MG-5085 A down-angle configurations, the series supports a wide range of recreational and commercial vessel duty cycles. Diesel Pro supplies replacement and service parts for Twin Disc MG-5085 marine transmissions, including components for maintenance, clutch service, lubrication systems, sealing systems, controls, and transmission overhaul. Browse available MG-5085 parts online or contact our team for assistance identifying the correct component for your transmission. Routine maintenance and overhaul of the MG-5085 can involve clutch, sealing, lubrication, control, and driveline components. Correct part selection should be based on the MG-5085 variant, reduction ratio, serial number, and existing component information. Friction plates, steel plates, clutch components, gasket sets, seals, and related overhaul parts are used to service internal MG-5085 assemblies. Worn clutch components can affect engagement and power transfer, while deteriorated seals and gaskets can contribute to transmission oil leakage. Replacement gaskets, O-rings, shaft seals, and related sealing components help maintain oil retention throughout the MG-5085 transmission. Seal selection should be confirmed using the specific transmission configuration and component location. The MG-5085 lubrication system supports clutch operation and internal component protection. Standard MG-5085 equipment includes an oil strainer, while transmission configurations may also incorporate additional oil filtration and cooling equipment. The MG-5085 uses a mechanical control valve as standard equipment, with other control arrangements available depending on transmission configuration. Output, coupling, control, and related driveline components should be matched to the specific installation before replacement. The MG-5085 Series includes two principal configurations: the MG-5085 SC shallow-case transmission and the MG-5085 A down-angle transmission. Both versions are designed around the same transmission family but use different reduction-ratio ranges and installation geometry. The MG-5085 SC uses a shallow-case configuration intended for marine installations where transmission geometry and shaft-line positioning favor a shallow-case arrangement. Available MG-5085 SC reduction ratios: The MG-5085 A uses a down-angle configuration for marine propulsion installations requiring a different relationship between the engine, transmission, and propeller shaft line. Available MG-5085 A reduction ratios: Because the MG-5085 SC and MG-5085 A do not share every reduction ratio, the transmission model and ratio should always be verified before ordering internal components or replacement transmission parts. The MG-5085 Series has a published maximum Pleasure Craft rating of 433 kW (580 hp) at 2300 RPM for selected ratios. Maximum allowable input speed is 3200 RPM. Actual allowable input power depends on reduction ratio and duty classification. Power ratings decrease for certain higher reduction ratios. Engine power, operating hours, vessel duty cycle, transmission ratio, and propulsion-system compatibility must therefore be evaluated together when determining the correct MG-5085 application. Published standard equipment for the MG-5085 SC and MG-5085 A includes components designed for integration into marine propulsion systems. The published dry weight with standard equipment is approximately 120 kg (265 lb) for the MG-5085 SC and 123 kg (271 lb) for the MG-5085 A. The MG-5085 Series can be configured with additional equipment according to propulsion-system and vessel requirements. Published factory options for the MG-5085 SC and MG-5085 A include: The MG-5085 can serve marine propulsion systems operating under different duty classifications, from pleasure craft to continuous-duty commercial vessels. Transmission selection should be based on the vessel's operating profile rather than horsepower alone. Pleasure Craft ratings are intended for qualifying planing-hull recreational applications with limited annual operating hours and relatively little operation at full engine throttle. Long-range pleasure cruisers, charter sportfishing vessels, and patrol vessels may fall under different duty classifications. Light Duty MG-5085 applications can include qualifying fire boats, sportfishing charter boats, patrol vessels, and selected thruster installations. Intermediate Duty applications can include ferries, fishing boats, crew boats, displacement yachts, and selected bow or stern thruster installations. Medium Duty applications can include mid-water trawlers, crew and supply boats, ferries, and some inland towing vessels. Continuous Duty operation is intended for applications with little variation in engine speed or power, including fishing trawlers, towboats, tugboats, and ocean-going vessels. Identifying the transmission as an MG-5085 is only the first step when selecting replacement components. The MG-5085 SC and MG-5085 A have different configurations and reduction-ratio options, and component requirements can also vary by serial number and installation. Before ordering MG-5085 parts, check the following information: Providing complete transmission information can help distinguish similar components and improve part-selection accuracy. Routine MG-5085 inspection should include transmission oil condition and level, leakage, operating temperature, shift engagement, unusual noise, and vibration. Changes in transmission behavior should be investigated before continued operation under heavy load. These symptoms can result from several different conditions. Hydraulic pressure testing, internal adjustments, torque specifications, and overhaul procedures should follow the appropriate service documentation for the specific MG-5085 configuration. Correct marine transmission selection involves more than matching engine horsepower to a published rating. Engine characteristics, reduction ratio, propeller load, shaft system, flexible coupling, vessel duty cycle, and torsional behavior all affect propulsion-system compatibility. A torsional vibration analysis may be required when engineering or repowering a propulsion system. Proper torsional compatibility helps protect the engine, transmission, coupling, shafting, and other drivetrain components from damaging vibration. Diesel Pro provides marine transmission parts organized by model, helping vessel owners, mechanics, shipyards, and fleet operators locate service components for MG-5085 transmissions and other marine gear applications. The MG-5085 SC is the shallow-case configuration, while the MG-5085 A is the down-angle configuration. The two versions also have different available reduction ratios, so the complete model designation should be verified when ordering parts. Published MG-5085 SC reduction ratios are 1.05:1, 1.22:1, 1.42:1, 1.76:1, 1.96:1, and 2.33:1. The installed ratio should be confirmed from the transmission identification information before ordering ratio-specific components. Published MG-5085 A reduction ratios are 1.05:1, 1.22:1, 1.47:1, 1.72:1, 2.04:1, and 2.43:1. These ratios differ from several of the ratios available for the MG-5085 SC. The MG-5085 Series has a published maximum rating of 433 kW (580 hp) at 2300 RPM for qualifying Pleasure Craft applications and applicable ratios. Permitted input power changes according to ratio and duty classification. The published maximum input speed for the MG-5085 Series is 3200 RPM. Engine and transmission compatibility must also satisfy the appropriate power rating, reduction ratio, and duty classification. Provide the complete MG-5085 model designation, serial number, reduction ratio, existing part number when available, and information about the required component. Identifying whether the transmission is an MG-5085 SC or MG-5085 A is especially important. Yes. Published MG-5085 ratings cover Light Duty, Intermediate Duty, Medium Duty, and Continuous Duty applications in addition to Pleasure Craft service. The correct rating depends on operating hours, load factor, vessel application, engine speed, and reduction ratio. Duty classification determines the allowable transmission input power for a specific operating profile. A transmission operating continuously under load cannot automatically use the higher horsepower rating published for limited-hour Pleasure Craft service. Browse available parts for Twin Disc MG-5085 SC and MG-5085 A marine transmissions at Diesel Pro. Confirming the complete model, serial number, and reduction ratio before ordering helps ensure that clutch, gasket, seal, lubrication, control, and overhaul components match the transmission being serviced. For parts assistance, contact Diesel Pro at 888-433-4735 within the United States or 305-545-5588 for international inquiries during regular business hours.
Twin Disc MG MG5085 Marine Transmission Parts
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Parts Available for Twin Disc MG-5085 Marine Transmissions
Clutch and Overhaul Parts for Twin Disc MG-5085
Gaskets and Seals for Twin Disc MG-5085
Oil System Components for Twin Disc MG-5085
Control and Driveline Components for Twin Disc MG-5085
MG-5085 Marine Transmission Specifications
MG-5085 SC Shallow-Case Transmission
MG-5085 A Down-Angle Transmission
MG-5085 Power Ratings and Input Speed
Published Duty Ratings
Standard Equipment for Twin Disc MG-5085
Available MG-5085 Configuration Options
Marine Applications for Twin Disc MG-5085
Pleasure Craft Applications
Light and Intermediate Duty Applications
Medium and Continuous Duty Applications
How to Identify the Correct MG-5085 Parts
Maintenance Considerations for Twin Disc MG-5085
Common Signs an MG-5085 May Need Service
MG-5085 Propulsion System Compatibility
Why Order MG-5085 Parts from Diesel Pro?
Frequently Asked Questions About Twin Disc MG-5085
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