Twin Disc MG5111 Marine Transmission Parts Catalog

Introduction: Proven Reliability for Marine Applications

The Twin Disc MG5111 marine transmission is designed to deliver exceptional performance and reliability for a wide range of vessels, including commercial fishing boats, workboats, offshore support vessels, and recreational craft . Engineered for smooth power transfer, durability, and long service life , the MG5111 is trusted by marine professionals around the world.

At Diesel Pro Power , we offer a complete range of MG5111 parts , from rebuilt transmissions to essential maintenance components. With fast global shipping, competitive pricing, and expert support , we ensure your MG5111 stays in top condition with minimal downtime.

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Rebuilt Twin Disc MG5111 Marine Transmissions for Sale

Our rebuilt MG5111 transmissions are meticulously reconditioned to OEM specifications , ensuring dependable performance and longevity. Each rebuilt transmission undergoes comprehensive inspection, reassembly with high-quality components, and rigorous testing.

Every rebuilt MG5111 transmission comes equipped with:

• Mechanical selector valve assembly (control valve)

• Pilot housing flange

• Oil pump

• Oil level gauge

• Output flange

Note: Drive ring sold separately.

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Essential MG5111 Parts for Maintenance and Overhaul

Overhaul Plate Kit – For Twin Disc MG5111 Transmission

Includes all brass friction plates and steel plates required for a complete clutch rebuild. Designed for durability, smooth clutch engagement, and consistent performance.

Gasket and Seal Kit – For Twin Disc MG5111 Transmission

Contains main housing gaskets, O-rings, seal rings, and auxiliary gaskets to ensure a leak-free seal and maintain system pressure during maintenance or overhauls.

Clutch Plates – For Twin Disc MG5111 Transmission

Available individually for targeted repairs, these brass and steel clutch plates ensure reliable performance and extended transmission life.

Rubber Block (Coupling) – For Twin Disc MG5111 Transmission

Absorbs vibrations, reduces stress on the drivetrain, and compensates for misalignments, ensuring quiet and smooth operation.

Seal – For Twin Disc MG5111 Transmission

High-quality input and output shaft seals and dynamic sealing solutions prevent fluid leaks and maintain internal pressure, protecting critical transmission components.

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Why Choose Diesel Pro Power for MG5111 Parts?

• Extensive inventory of MG5111 parts, including rebuilt transmissions, overhaul kits, clutch plates, seals, and more.

• Fast global shipping , with most orders processed within 24 hours.

• Competitive pricing on high-quality parts that meet or exceed OEM standards.

• Expert technical support to assist with part selection and installation guidance.

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Frequently Asked Questions (FAQs) about the Twin Disc MG5111

1. What types of vessels use the MG5111 transmission?

The MG5111 is suitable for fishing boats, tugboats, offshore support vessels, workboats, and recreational craft , offering reliable performance in various marine environments.

2. What essential parts should I keep on hand for maintenance?

Key parts include the overhaul plate kit, gasket and seal kit, clutch plates, coupling (rubber block), and seals .

3. What is included in the overhaul plate kit?

It contains all brass friction plates and steel plates required for a complete clutch rebuild.

4. How often should I replace the oil and filter in the MG5111?

Change the oil and filter every 500 hours of operation or annually , whichever comes first.

5. How do I know when to replace the coupling?

Replace it if you notice increased vibrations, noise, or visible wear and cracking during inspections.

6. Are Diesel Pro’s aftermarket parts reliable?

Yes! Our aftermarket parts are engineered to meet or exceed OEM standards , ensuring long-lasting performance and reliability.

7. How quickly can I get MG5111 parts from Diesel Pro Power?

Most orders are processed within 24 hours , with fast worldwide shipping options available.

8. What are the signs that my MG5111 needs maintenance or overhaul?

Watch for slipping gears, fluid leaks, overheating, unusual noises, or reduced performance .

9. Can Diesel Pro Power help me select the right parts for my MG5111?

Absolutely! Our knowledgeable team provides expert support and guidance for selecting the correct parts and ensuring proper installation.

10. Do you offer warranties on rebuilt MG5111 transmissions and parts?

Yes, we provide a comprehensive warranty on rebuilt transmissions and parts. Contact us for full details.

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Marine Transmission Specifications & Applications of the Twin Disc MG5111

Overview of the Twin Disc MG5111 Marine Transmission

The Twin Disc MG5111 is a medium-duty marine transmission built for consistent performance in commercial and industrial marine applications. It delivers a balance of horsepower handling, reliability, and installation flexibility for workboats, ferries, patrol vessels, and offshore service craft. Designed for continuous-duty operation, the MG5111 provides smooth hydraulic clutch engagement and long service life under harsh marine conditions.

This model is engineered to work with marine diesel engines in the 400–600 horsepower range and supports both straight and down-angle output configurations. With multiple gear ratios, SAE No. 1 or 2 housing compatibility, and optional PTO and trolling valve configurations, the MG5111 is a reliable solution for marine professionals seeking a durable and serviceable transmission.

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Key Specifications of the Twin Disc MG5111

• Type: Marine transmission with hydraulic multi-disc clutch

• Horsepower Rating (Approximate):

• Continuous Duty: Up to 450 HP @ 1800 RPM

• Intermittent Duty: Up to 575 HP @ 2300 RPM

• Maximum Input Speed: 2500 RPM

• Reduction Ratios Available:

• 1.51:1

• 1.93:1

• 2.48:1

• 2.96:1

• 3.52:1

• Input Housing: SAE No. 1 or SAE No. 2

• Flywheel Compatibility: 14", 11.5"

• Clutch Type: Hydraulically actuated, oil-cooled multi-disc clutch

• Cooling System: Oil-to-water heat exchanger standard; oil-to-air cooler optional

• Lubrication: Pressure-lubricated system with internal oil pump

• Oil Capacity: Approximately 10–12 quarts depending on configuration

• Dry Weight: Approximately 500–600 lbs

• Mounting Options: Available in straight or down-angle output

• Rotation Compatibility: Supports both left-hand and right-hand engine rotation

• Optional Features:

• Hydraulic or mechanical PTO

• Trolling valve for slow-speed operation

• Flexible or rigid engine mounting

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Common Marine Applications for the MG5111

The MG5111 is frequently used in light- to mid-duty commercial and offshore support vessels where a dependable, cost-effective, and serviceable marine transmission is required. Typical applications include:

• Commercial Fishing Boats: Inshore and coastal vessels that require steady propulsion under varying load conditions.

• Pilot and Patrol Boats: Smooth shifting and responsive torque handling in mission-critical harbor and coastal enforcement vessels.

• Crew Boats and Supply Vessels: Reliable for continuous operation in Gulf and offshore energy service sectors.

• Tour Boats and Small Ferries: Dependable for passenger-carrying vessels requiring high uptime and smooth operation.

• Research and Survey Craft: Performs well in applications involving frequent engine cycling and maneuvering.

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Most Common Engine Models Paired with the Twin Disc MG5111

The MG5111 is typically paired with marine diesel engines producing 400–600 horsepower. Its flexible housing options and gear ratios make it compatible with several leading engine brands.

Cummins Marine Engines

• Cummins QSM11

• Cummins ISC 8.3
  These engines are common in patrol craft, survey boats, and mid-size supply vessels, offering excellent torque for MG5111 integration.

Detroit Diesel Marine Engines

• Detroit Diesel 6V92

• Detroit Diesel 8V92TI
  Frequently installed in legacy fleets and refits, these two-stroke engines work well with MG5111 transmissions in workboats and tugs.

Caterpillar Marine Engines

• Caterpillar 3116 / 3126 (high ratings)

• Caterpillar C9 / C12
  These Cat engines are often matched with MG5111 transmissions for coastal ferries, research vessels, and commercial fishing applications.

John Deere Marine Engines

• John Deere 6090SFM85

• John Deere 6135SFM85
  Used in high-performance utility boats and pilot craft, these engines align well with the MG5111’s hydraulic clutch and ratio range.

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Key Advantages of the MG5111 Transmission

• High Torque Handling: Designed for marine engines in the 400–600 HP range, ideal for medium-duty commercial propulsion.

• Hydraulic Clutch Performance: Oil-cooled multi-disc clutch offers reliable, smooth shifting under full load.

• Flexible Output Options: Straight and down-angle configurations for easier shaft alignment and installation.

• Gear Ratio Versatility: Multiple gear reductions allow customization based on propeller sizing and hull dynamics.

• Aftermarket Friendly: Easily serviced with parts and rebuild kits from Diesel Pro Power.

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Ideal Use Cases for the MG5111