Twin Disc MG5111A Marine Transmission Parts Catalog

Introduction: Premium Quality Parts for Dependable Performance

The Twin Disc MG5111A marine transmission is a trusted choice for a wide range of marine vessels, delivering smooth power transfer, durable construction, and long-lasting performance. Whether for commercial or recreational use, the MG5111A is engineered to meet the rigorous demands of marine environments.

At Diesel Pro Power, we offer a complete selection of MG5111A parts, including overhaul kits, gasket sets, oil filtration parts, seals, and other essential components. Our commitment to quality, combined with fast shipping and expert support, ensures that your transmission stays in top condition with minimal downtime.

Our Selection of Twin Disc MG5111A Parts

As the largest online retailer specializing in Twin Disc replacement parts, Diesel Pro Power ensures that you have easy access to high-quality components tailored for your MG5111A transmission:

Overhaul Plate Kit – For Twin Disc MG5111A Transmission

Includes a complete set of brass friction plates and steel plates, ensuring smooth clutch engagement and reliable performance during major maintenance or repairs.

Gasket and Seal Kit – For Twin Disc MG5111A Transmission

Contains essential components including main housing gaskets, O-rings, seal rings, and auxiliary gaskets, maintaining leak-free operation and system integrity during overhauls.

Oil Filtration Parts – For Twin Disc MG5111A Transmission

High-quality oil filters and strainers designed to remove contaminants, ensuring clean lubrication and prolonging transmission life.

Seals – For Twin Disc MG5111A Transmission

Includes input and output shaft seals, crafted from marine-grade materials for superior resistance to pressure, temperature fluctuations, and environmental stress.

Additional Components Available:

• Marine Controls and Bulbs

• Mounting Hardware

• Gaskets, Seals, and O-Rings

With Diesel Pro Power’s comprehensive inventory, you can easily locate the parts you need and complete your project without delay.

Why Choose Diesel Pro Power for MG5111A Parts?

• 24-Hour Worldwide Shipping: Most orders are processed and shipped within 24 hours, ensuring quick delivery to your location.

• Extensive Inventory: We keep a vast selection of MG5111A parts in stock, ready for immediate dispatch.

• Excellent Customer Service: Our friendly, knowledgeable team is available to assist with product selection, specifications, and technical support.

• Trusted by Over 15,000 Customers: Mechanics, commercial operators, and private boat owners rely on Diesel Pro Power for all their Twin Disc parts needs.

• Easy Online Shopping: Our user-friendly website makes it simple to find and order parts for your specific engine, without leaving your desk.

Frequently Asked Questions (FAQs) about the Twin Disc MG5111A

1. What types of vessels use the MG5111A transmission?

The MG5111A is commonly used in fishing boats, offshore support vessels, workboats, and recreational boats, providing reliable power transfer and performance.

2. What essential parts are available for MG5111A maintenance?

Key components include the overhaul plate kit, gasket and seal kit, oil filtration parts, seals, marine controls, bulbs, and more.

3. What’s included in the overhaul plate kit?

A complete set of brass friction plates and steel plates, ensuring a thorough clutch rebuild and consistent performance.

4. How fast can I get MG5111A parts from Diesel Pro Power?

We offer 24-hour worldwide shipping, ensuring that your order arrives quickly and reliably.

5. Are Diesel Pro Power’s aftermarket parts reliable?

Yes! Our parts are engineered to meet or exceed OEM standards, providing long-lasting performance and durability.

6. How do I select the right parts for my MG5111A?

Our website makes it easy to find parts tailored to your engine model. For additional guidance, our customer service team is ready to assist.

7. What are signs that my MG5111A transmission needs service?

Look for fluid leaks, unusual noises, slipping gears, overheating, or reduced performance, which may indicate the need for maintenance or repairs.

8. Do you offer technical support for installation?

Absolutely! Our experienced team provides expert advice, troubleshooting support, and guidance for proper installation.

9. Can I shop for other Twin Disc transmission parts on your website?

Yes! Explore our extensive catalog of Twin Disc transmission parts, covering multiple models and applications.

10. How do I place an order for MG5111A parts?

Visit our website, browse the MG5111A parts catalog, select the items you need, and complete your order securely online. Contact us if you have any questions or need assistance.

Order Twin Disc MG5111A Parts Today

Choose Diesel Pro Power as your trusted supplier for Twin Disc MG5111A marine transmission parts. With fast shipping, expert support, and a commitment to quality, we make it easy to keep your transmission running smoothly.

Browse our selection today and experience the Diesel Pro Power difference.

Marine Transmission Specifications & Applications of the Twin Disc MG5111A

Overview of the Twin Disc MG5111A Marine Transmission

The Twin Disc MG5111A is a heavy-duty marine transmission engineered for medium to high-horsepower propulsion systems in commercial and industrial marine environments. As an evolution of the proven MG5111, the MG5111A features an 8° down-angle output configuration that simplifies shaft alignment in vessels with restricted engine room clearance. This makes it particularly popular in patrol boats, crew boats, ferries, and offshore supply vessels where space efficiency and torque performance are essential.

Built with a cast-iron case, oil-cooled hydraulic multi-disc clutch, and multiple reduction ratios, the MG5111A is designed to deliver long-lasting performance under continuous-duty cycles. Its compatibility with SAE No. 1 and No. 2 housings ensures integration with many mid- to high-horsepower diesel engines in the 400–575 HP range.

Key Specifications of the Twin Disc MG5111A

• Type: Marine transmission with down-angle output and hydraulic 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 cooling optional

• Lubrication System: Internal oil pump with pressure-fed lubrication

• Oil Capacity: Approximately 10–12 quarts

• Dry Weight: Approximately 525–625 lbs

• Mounting Configuration: 8° down-angle output

• Rotation Compatibility: Bi-directional input (left-hand or right-hand engine rotation)

• Optional Features:

• Mechanical or hydraulic PTO

• Trolling valve for precise maneuvering

• Flexible or rigid mounts

Common Marine Applications for the MG5111A

The MG5111A is optimized for vessels that need high torque, compact packaging, and smooth propulsion in continuous- or high-intermittent-duty environments. Typical use cases include:

• Crew and Supply Boats: Ideal for offshore service fleets where quick shift response and minimal maintenance are critical.

• Passenger Ferries and Tour Vessels: Smooth, quiet operation for high-cycle vessels that require low-vibration engagement.

• Patrol and Pilot Boats: High reliability and fast maneuverability in demanding public sector and private operations.

• Fishing Boats (Mid-Sized): Suited for trawlers and gillnetters operating in coastal or near-offshore zones.

• Utility Vessels and Workboats: Used in a variety of roles including line handling, crew transfer, and harbor support.

Most Common Engine Models Paired with the Twin Disc MG5111A

The MG5111A is typically mated with diesel engines in the 400–575 horsepower range. Its down-angle configuration, compact footprint, and SAE No. 1 or 2 compatibility allow it to integrate with many modern marine engines:

Cummins Marine Engines

• Cummins QSM11

• Cummins ISC 8.3
  These Cummins platforms offer robust mid-range horsepower and are commonly found in patrol boats and service vessels paired with MG5111A gearboxes.

Caterpillar Marine Engines

• Caterpillar 3126 / C7 (high ratings)

• Caterpillar C9
  Well-suited for ferry and utility applications where reliable down-angle integration is required in tight engine rooms.

John Deere Marine Engines

• John Deere 6090SFM85

• John Deere 6135SFM85
  Used in high-torque, mid-speed workboats and pilot craft, these engines pair efficiently with the MG5111A in continuous operation roles.

Detroit Diesel Marine Engines

• Detroit Diesel 6V92

• Detroit Diesel 8V92 (light-duty ratings)
  Common in refits and legacy platforms, these two-stroke engines remain relevant in older fleets supported by MG5111A down-angle retrofits.

Advantages of the Twin Disc MG5111A

• 8° Down-Angle Output: Simplifies engine installation and shaft alignment in compact hulls or shallow bilges.

• Smooth Hydraulic Clutch: Multi-disc oil-cooled clutch provides consistent, vibration-free engagement.

• Wide Ratio Options: Available gear reductions allow for vessel-specific thrust optimization.

• Heavy-Duty Build: Designed for continuous-duty operation in harsh marine environments.

• Strong Aftermarket Support: Diesel Pro Power stocks parts and kits for full overhaul and service.

Ideal Use Cases for the MG5111A