Twin Disc MG 521 Marine Transmission Parts

-
Select Parts Category

Twin Disc MG521 Marine Transmission Reb uilt Transmissions & Parts Catalog

Introduction: Premium-Quality Parts for Smooth, Reliable Marine Performance

The Twin Disc MG521 marine transmission is renowned for its robust construction, smooth power transfer, and long-lasting reliability. It’s designed to meet the demands of a wide range of marine applications, including fishing boats, tugboats, workboats, and offshore supply vessels.

At Diesel Pro Power, we provide a comprehensive selection of MG521 parts, including rebuilt transmissions, overhaul plate kits, gasket sets, plate kits, rubber blocks, and oil pump and filter assemblies. Our commitment to exceptional quality, fast shipping, and expert support ensures your MG521 transmission remains operational with minimal downtime.

Rebuilt Twin Disc MG521 Marine Transmissions for Sale

Our rebuilt Twin Disc MG521 marine transmissions are meticulously reconditioned to meet and exceed OEM specifications, ensuring smooth, reliable operation and long-lasting durability. Each rebuilt unit undergoes complete disassembly, thorough inspection, precision reassembly using high-quality components, and rigorous testing to ensure optimal performance under real-world conditions.

Every rebuilt MG521 transmission comes equipped with essential components, including:

Mechanical selector valve assembly (control valve) – For precise, responsive gear shifting and reliable power transfer.
Pilot housing flange – Ensures secure, stable mounting between the transmission and engine.
Oil pump – Maintains continuous oil flow, providing critical lubrication to reduce friction and extend component life.
Oil level gauge – Facilitates easy monitoring of fluid levels, promoting regular maintenance.
Output flange – Provides a secure connection to the propeller shaft, ensuring efficient and reliable power transfer.

Note: Drive ring is sold separately. All rebuilt MG521 transmissions are sold with a refundable core deposit. See details for more information.

Twin Disc MG521 Marine Transmission 2.0:1 for Sale

The 2.0:1 ratio strikes an excellent balance between speed and torque, making it a versatile choice for commercial fishing boats, mid-sized workboats, and recreational vessels. It offers efficient cruising performance while maintaining adequate thrust for typical operational conditions. Vessels that require smooth maneuverability combined with fuel efficiency benefit greatly from this ratio. It’s ideal for operations where moderate load and quick responsiveness are essential.

Twin Disc MG521 Marine Transmission 3.0:1 for Sale

The 3.0:1 ratio provides enhanced pulling power, delivering superior torque for vessels that handle heavier loads, such as utility vessels, offshore supply boats, and larger fishing vessels. This ratio is ideal for applications where strong propulsion is needed for towing, hauling, or operating in challenging conditions with variable loads. The 3.0:1 ratio ensures a balance between dependable thrust and manageable speed for operators needing both power and versatility.

Twin Disc MG521 Marine Transmission 3.5:1 for Sale

The 3.5:1 ratio offers even greater torque, making it suitable for larger workboats, trawlers, and vessels engaged in demanding operational conditions. This ratio excels in scenarios where enhanced control and strong power delivery are essential, such as rough seas, heavy payloads, or continuous operations. Vessels equipped with the 3.5:1 ratio benefit from improved handling and stability while maintaining reliable fuel economy and power output.

Twin Disc MG521 Marine Transmission 4.0:1 for Sale

The 4.0:1 ratio delivers maximum torque and exceptional control, making it the go-to choice for tugboats, large cargo vessels, offshore support craft, and other heavy-duty marine operations. This ratio excels in situations where powerful, steady propulsion is required for maneuvering in ports, towing large loads, or maintaining position in strong currents. Its high torque output ensures smooth and confident operation under even the most demanding marine conditions, providing peace of mind and superior performance for vessel operators.

Our Selection of Twin Disc MG521 Parts

Overhaul Plate Kit – For Twin Disc MG521 Transmission

Our overhaul plate kit includes all the brass friction plates and steel plates needed for a complete clutch rebuild, restoring smooth engagement and consistent transmission performance. Designed to withstand high loads and continuous use, this kit ensures long-term operational efficiency.

Gasket Set – For Twin Disc MG521 Transmission

A complete gasket set featuring main housing gaskets, O-rings, seal rings, and auxiliary gaskets. These components ensure a leak-free seal, maintaining system pressure and integrity during maintenance or overhaul. Manufactured from premium materials for durability in harsh marine environments.

Plate Kit – For Twin Disc MG521 Transmission

A selection of individual brass and steel plates for targeted clutch repairs. Ideal for addressing specific wear or damage, this kit offers a cost-effective solution for maintaining smooth clutch performance.

Rubber Blocks (Couplings) – For Twin Disc MG521 Transmission

The rubber block, also known as a torsional isolator, connects the transmission output flange to the propeller shaft. It effectively absorbs vibrations, reduces stress on drivetrain components, and compensates for misalignments caused by hull flex or engine movement. Made from durable, marine-grade materials for long-lasting performance.

Oil Pump and Filter – For Twin Disc MG521 Transmission

The oil pump and filter assembly ensures consistent lubrication and filtration of transmission fluid, reducing wear on internal components and extending transmission life. The oil pump maintains continuous oil flow under demanding conditions, while the filter removes contaminants for optimal system performance.

Why Choose Diesel Pro Power for MG521 Parts?

24-Hour Worldwide Shipping: Orders are processed and shipped quickly to minimize vessel downtime.
Extensive Inventory: We carry a comprehensive selection of MG521 parts in stock and ready to ship.
Expert Customer Support: Our team provides guidance on product selection, installation, and maintenance.
Over 15,000 Satisfied Customers: Trusted by marine operators and mechanics worldwide for quality parts and reliable service.
Easy Online Shopping: Our user-friendly website makes it simple to browse, select, and order parts from the comfort of your home or office.

Frequently Asked Questions (FAQs) about the Twin Disc MG521

1. What types of vessels use the MG521 transmission?

The MG521 is used in a variety of vessels, including fishing boats, tugboats, offshore supply vessels, workboats, and recreational vessels.

2. What essential parts should I have on hand for MG521 maintenance?

Essential parts include the rebuilt gear, overhaul plate kit, gasket set, plate kit, rubber blocks, and oil pump and filter.

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

A complete set of brass friction plates and steel plates, designed to restore smooth clutch engagement and reliable performance.

4. How fast can I get MG521 parts from Diesel Pro Power?

We offer 24-hour worldwide shipping, ensuring fast delivery to your location.

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

Yes! Our parts are engineered to meet or exceed OEM standards, providing dependable performance and longevity.

6. How do I know which parts I need for my MG521?

Our website makes it easy to find parts specific to your engine. For additional guidance, our expert support team is available to assist.

7. What are signs that my MG521 transmission needs maintenance?

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

8. Do you offer technical support?

Absolutely! Our knowledgeable team is available to provide expert advice, troubleshooting support, and installation guidance.

9. Can I purchase parts for other Twin Disc transmissions?

Yes! We offer a wide selection of parts for other Twin Disc models, all available through our online store.

10. How do I place an order?

Visit our website, browse the MG521 parts catalog, select your items, and complete your order online. Contact us if you have any questions.

Order Twin Disc MG521 Parts Today

Choose Diesel Pro Power as your trusted supplier of Twin Disc MG521 marine transmission parts. With fast shipping, expert support, and quality you can rely on, we make it easy to keep your MG521 running smoothly.

Explore our catalog today and place your order with confidence. For assistance, contact us at 888-433-4735 (US) or 305-545-5588 (International) during business hours (8 a.m. to 5 p.m. EST, Monday–Friday).