Twin Disc MG514C Marine Transmission Parts Catalog

High-Quality Parts for Exceptional Marine Performance

Diesel Pro Power offers a comprehensive selection of Twin Disc MG514C marine transmission parts, designed to ensure long-lasting performance and reliability for your vessel. From rebuilt MG514 transmissions to essential components like overhaul plate kits, bearing kits, gaskets, ring kits, plates, couplings, seals, oil pumps and filters, gauges, and oil coolers, we have everything you need to keep your MG514C running smoothly.

Whether you’re planning a complete overhaul or routine maintenance, Diesel Pro Power’s inventory has you covered. With fast shipping, competitive pricing, and expert support, you’ll get the parts you need without delay.

Rebuilt Twin Disc MG514C Transmissions: Gear Ratios and Case Configurations

At Diesel Pro Power, we offer a comprehensive selection of rebuilt Twin Disc MG514C marine transmissions, meticulously reconditioned to meet OEM standards. Each unit is thoroughly inspected, rebuilt using high-quality components, and tested to ensure reliable operation in demanding marine environments.

Available Gear Ratios and Case Types

Our rebuilt Twin Disc MG514C marine transmissions are available in various gear ratios and case configurations to suit a range of vessel requirements:

Twin Disc MG514C Marine Transmission 2.0:1 for sale – Shallow Case

Perfect for vessels requiring a balance of speed and torque, such as patrol boats and fast ferries. This shallow case design features a 6-gallon oil capacity, making it ideal for space- and weight-sensitive applications.

Twin Disc MG514C Marine Transmission 3.0:1 for sale – Shallow Case

Offers a versatile mix of speed and thrust, suitable for commercial fishing boats and mid-sized workboats. The shallow case configuration provides a compact design and 6-gallon oil capacity for efficient operation.

Twin Disc MG514C Marine Transmission 4.0:1 for sale – Deep Case

Delivers increased torque for heavier vessels, such as cargo boats and larger fishing vessels. The deep case design includes a 9-gallon oil capacity to enhance cooling and lubrication during continuous operations.

Twin Disc MG514C Marine Transmission 4.5:1 for sale – Deep Case

Engineered for applications needing high thrust at lower speeds, including trawlers and utility boats. The deep case configuration offers enhanced durability and torque capacity.

Twin Disc MG514C Marine Transmission 5.0:1 for sale – Deep Case

Provides substantial torque and excellent control for heavy-duty commercial vessels. The deep case design ensures reliable performance under high-load conditions, making it a preferred choice for demanding operations.

Twin Disc MG514C Marine Transmission 6.0:1 for sale – Deep Case

Delivers maximum torque and control for the most challenging applications, including tugboats and heavy-duty commercial vessels. The deep case configuration supports continuous heavy-load performance and long-term durability.

Deep Case vs. Shallow Case Configurations

Choosing between a deep case and shallow case MG514C transmission depends on your vessel’s operational requirements:

• Shallow Case: Compact design with a 6-gallon oil capacity, suitable for lighter vessels and applications prioritizing space efficiency.

• Deep Case: Larger design with a 9-gallon oil capacity, offering enhanced cooling, lubrication, and durability for heavy-duty applications.

Included Components in Rebuilt MG514C Transmissions

Each rebuilt transmission includes:

• Mechanical selector valve assembly (control valve)

• Pilot housing flange

• Oil pump

• Oil level gauge

• Output flange
  Note: The drive ring is sold separately.

Maintenance Recommendations for MG514C Transmissions

• Change oil and clean the filter screen every 6 months or 1,000 hours of operation.

• Use SAE 30W engine oil for temperatures between 150°F and 185°F, and SAE 40W engine oil for 185°F to 210°F.

• Maintain a pressure range of 200-227 PSI at 1800 RPM and 180°F.

• Ensure oil pump capacity is maintained at 18.7 GPM at 2500 RPM.

By following these guidelines, you’ll ensure long-term reliability and optimal performance for your Twin Disc MG514C marine transmission.

 

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Essential MG514C Parts Categories

Rebuilt MG514 Transmission – For Twin Disc MG514C Transmission

Our rebuilt MG514 transmissions are expertly remanufactured to OEM standards, ensuring reliable performance and extending the life of your MG514C drivetrain. Each unit is inspected, rebuilt with high-quality components, and thoroughly tested for quality assurance.

Overhaul Plate Kit – For Twin Disc MG514C Transmission

Our overhaul plate kit includes all the brass and steel plates needed for a complete clutch rebuild. Engineered for durability and smooth engagement, this kit is essential for restoring clutch performance during transmission overhauls.

Bearing Kit – For Twin Disc MG514C Transmission

The bearing kit contains high-quality bearings designed to reduce friction, maintain alignment, and ensure smooth operation of the MG514C transmission. Precision-engineered for long-lasting performance under high-load marine conditions.

Gasket Set – For Twin Disc MG514C Transmission

Our gasket set provides everything needed to achieve a leak-free seal during maintenance or overhaul. Includes main housing gaskets, O-rings, seal rings, and auxiliary gaskets made for the unique requirements of the MG514C.

Ring Kit – For Twin Disc MG514C Transmission

The ring kit includes all the sealing and retaining rings necessary for restoring system tolerances and integrity. Ideal for use during complete overhauls, these high-quality rings ensure the MG514C continues operating at peak performance.

Plate – For Twin Disc MG514C Transmission

Our individual brass and steel plates provide a cost-effective solution for replacing specific worn or damaged plates, maintaining the clutch system’s integrity and performance without needing a full kit.

Rubber Block (Coupling) – For Twin Disc MG514C Transmission

The rubber block or torsional isolator connects the transmission output flange to the propeller shaft, absorbing vibrations, reducing stress, and compensating for misalignments. Made from marine-grade materials, ensuring long-lasting performance for the MG514C.

Seal – For Twin Disc MG514C Transmission

Our high-quality seals for the MG514C transmission prevent fluid leaks and contamination, maintaining internal pressure and protecting critical components. Engineered for durability in harsh marine environments.

Oil Pump & Filter – For Twin Disc MG514C Transmission

The oil pump and filter system ensures continuous lubrication and protects the MG514C from wear and damage by maintaining clean, contaminant-free oil. Designed for long-term, high-demand operation.

Gauges – For Twin Disc MG514C Transmission

Our gauges provide accurate monitoring of transmission parameters such as oil pressure, temperature, and system performance, helping you maintain peak operating conditions and prevent potential issues.

Oil Cooler – For Twin Disc MG514C Transmission

The oil cooler helps regulate transmission temperature, preventing overheating and extending the life of the MG514C’s internal components. Built from corrosion-resistant materials for dependable performance in marine environments.

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Marine Transmission Specifications & Applications of the Twin Disc MG514C

Overview of the Twin Disc MG514C Marine Transmission

The Twin Disc MG514C is a robust, high-performance marine transmission engineered for medium- to heavy-duty marine propulsion systems. Designed to deliver consistent torque transfer and long-term reliability, the MG514C is a popular choice for workboats, ferries, trawlers, and other commercial vessels operating under challenging marine conditions.

Featuring a rugged cast-iron housing, oil-cooled hydraulic clutch, and multiple gear ratio options, the MG514C offers the flexibility to match various diesel engines and vessel configurations. Its proven design supports both high-output commercial diesel engines and demanding duty cycles, making it a trusted component in fleets requiring durability, efficiency, and ease of service.

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Key Specifications of the Twin Disc MG514C

• Type: Heavy-duty marine transmission with hydraulic multi-disc clutch

• Horsepower Rating (Approximate):

• Continuous Duty: Up to 875 HP @ 1800 RPM

• Intermittent Duty: Up to 1,000 HP @ 2300 RPM

• Maximum Input Speed: 2500 RPM

• Reduction Ratios Available:

• 2.00:1

• 2.50:1

• 3.00:1

• 3.50:1

• 4.00:1

• Input Housing: SAE No. 0 or SAE No. 1

• Flywheel Compatibility: 18", 14"

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

• Cooling System: Oil-to-water heat exchanger standard

• Lubrication System: Internal pressure-fed lubrication

• Oil Capacity: Approximately 25–30 quarts

• Dry Weight: 1,500–1,900 lbs (depending on configuration)

• Mounting Options: Available in straight and down-angle versions

• Rotation Compatibility: Bi-directional input (for LH and RH rotating engines)

• Optional Features:

• Trolling valve

• PTO (hydraulic or mechanical)

• Electronic shift readiness

• Flexible or rigid mount compatibility

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Common Marine Applications for the MG514C

The Twin Disc MG514C is engineered for commercial vessels that operate under moderate to high load profiles and require smooth propulsion response. It is commonly installed in:

• Commercial Fishing Trawlers: Offers durability and consistent gear engagement under load

• Ferries and Crew Boats: Supports medium- to high-speed operation with smooth shifting

• Tugboats (Medium Duty): Reliable torque handling and support for hydraulic systems via PTO

• Patrol and Government Vessels: Fast clutch response for maneuverability and mission readiness

• Supply Boats and Utility Vessels: Built to withstand continuous operations and heavy workloads

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Most Common Engine Models Paired with the Twin Disc MG514C

The MG514C is frequently paired with mid- to high-horsepower marine diesel engines across several manufacturers. It is especially well-suited for vessels using engines in the 700–1,000 HP range:

Cummins Marine Engines

• Cummins KTA19-M3

• Cummins QSK19 (medium output)
  These high-performance engines are often used in commercial and offshore support applications alongside the MG514C.

Caterpillar Marine Engines

• Caterpillar 3406C / 3406E

• Caterpillar C18 (light to medium duty ratings)
  The torque profile of these Caterpillar engines matches well with MG514C’s gear capacity and reduction range.

John Deere Marine Engines

• John Deere 6135SFM85 (high ratings)
  A capable pairing for high-demand commercial vessels requiring responsive gear transitions.

Detroit Diesel Marine Engines

• Detroit Diesel 8V92TA

• Detroit Diesel Series 60 (marine variants)
  Common in refits and mid-sized commercial fleets, these engines are often matched with MG514C gearboxes.

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Advantages of the Twin Disc MG514C

• Wide Gear Ratio Selection: Allows for flexible propulsion setups based on vessel needs

• Oil-Cooled Clutch System: Enhances longevity under continuous or variable load operations

• PTO Compatibility: Powers hydraulic winches, pumps, and deck gear for multipurpose vessels

• Durable Construction: Cast iron housing and heavy-duty internals built for marine longevity

• Bi-Directional Operation: Supports both port and starboard installations with ease

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Ideal Use Cases for the MG514C

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Additional Resources

 Practical Guide To Servicing Your Twin Disc MG514C Marine Gear

Introduction

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• Overview of the Twin Disc MG514C Marine Gear

• Key Specifications and Features

• General Maintenance Recommendations

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1. Safety Precautions for Twin Disc MG514C Marine Gear

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• Personal Protective Equipment (PPE)

• Safe Handling and Maintenance Practices

• Hazard Identification and Mitigation
  

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2. Installation Guide for Twin Disc MG514C Marine Gear

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• Pre-Installation Checklist

• Tools and Equipment Required

• Mounting Procedures

• Alignment Procedures

• Initial Lubrication

• Final Inspection and Testing
  

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3. Operating Instructions for Twin Disc MG514C Marine Gear

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• Start-up Procedures

• Gear Shifting Instructions

• Recommended Operating Practices

• Monitoring Performance During Operation
  

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4. Maintenance Schedule and Procedures for Twin Disc MG514C Marine Gear

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• Routine Maintenance Schedule

• Lubrication Guidelines and Oil Specifications

• Inspection Checklist for Key Components

• Cleaning and Storage Tips
  

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5. Troubleshooting Common Issues for Twin Disc 514C Marine Gear

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• Identifying Common Symptoms and Diagnosing Problems

• Step-by-Step Solutions for Common Failures

• When to Seek Professional Assistance
  

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6. Component Overview and Replacement Procedures for Twin Disc MG514C Marine Gear

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• Detailed Description of Major Components

• Guidelines for Disassembly and Assembly

• Replacement Procedures for Critical Parts

• Recommended Torque Specifications
  

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7. Technical Specifications for Twin Disc MG514C Marine Gear

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• Detailed Specifications for Gears, Bearings, and Housing

• Oil Capacity and Type Recommendations

• Temperature and Pressure Ranges
  

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8. Parts List and Identification for Twin Disc MG514C Marine Gear

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• Complete Parts List with Diagrams

• How to Identify and Order Replacement Parts

• Tips for Ensuring Compatibility
  

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9. Rebuild and Overhaul Instructions for Twin Disc MG514C Marine Gear

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• Detailed Steps for Gear Overhaul

• List of Recommended Tools and Replacement Kits

• Quality Assurance After Overhaul
  

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10. Storage and Preservation Guidelines for Twin Disc MG514C Marine Gear

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• Long-Term Storage Instructions

• Corrosion Prevention Tips

• Preparing the Gear for Reuse
  

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FAQ for Twin Disc MG514C Marine Gear

Disclaimer: For more detailed procedures, measurements, and specifications, always refer to the OEM service manual.

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Why Choose Diesel Pro Power for MG514C Parts?

• Extensive inventory of Twin Disc MG514C parts, including all essential maintenance components.

• Fast order processing and global shipping, with most orders shipped within 24 hours.

• Competitive pricing and reliable aftermarket parts that meet or exceed OEM standards.

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

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Shop with Confidence

Maintaining your Twin Disc MG514C transmission is easy with Diesel Pro Power’s comprehensive selection of parts and fast, reliable service. Place your order online today, and rest assured that your parts will ship quickly, keeping your vessel operating at peak performance.

Frequently Asked Questions (FAQs) about the Twin Disc MG514C

1. What is the Twin Disc MG514C marine transmission used for?

The MG514C is designed for commercial fishing boats, trawlers, offshore supply vessels, and other marine applications requiring robust performance, reliable power transfer, and long-term durability.

2. What are the available gear ratios for the MG514C?

Diesel Pro Power offers rebuilt MG514C transmissions in gear ratios of 2.0:1, 3.0:1, 4.0:1, 4.5:1, 5.0:1, and 6.0:1, with deep case or shallow case configurations to suit various vessel requirements.

3. What is the difference between the deep case and shallow case MG514C transmission?

A shallow case has a 6-gallon oil capacity and is more compact, ideal for lighter applications or limited-space installations. The deep case features a 9-gallon oil capacity and is designed for continuous, high-load operations, providing enhanced cooling and lubrication.

4. What parts are included in the rebuilt MG514C transmission?

Rebuilt MG514C transmissions include the mechanical selector valve assembly, pilot housing flange, oil pump, oil level gauge, and output flange. Note: The drive ring is sold separately.

5. How often should I change the oil and clean the filter screen in my MG514C transmission?

It is recommended to change the oil and clean the filter screen every six months or after 1,000 hours of operation, whichever comes first.

6. What type of oil should I use in my MG514C transmission?

Use SAE 30W engine oil for operating temperatures between 150°F and 185°F, and SAE 40W engine oil for temperatures between 185°F and 210°F.

7. What are the key maintenance parts for the MG514C transmission?

Essential parts for maintenance include the overhaul plate kit, gasket set, ring kit, bearing kit, plates, rubber block, seals, oil pump & filter, gauges, and oil cooler. These ensure continued reliability and performance.

8. What are signs that my MG514C transmission may need an overhaul?

Watch for slipping gears, unusual noises, fluid leaks, overheating, or reduced performance. These may indicate the need for an overhaul or replacement of key components.

9. How quickly can I receive MG514C parts from Diesel Pro Power?

Most orders are processed within 24 hours and shipped worldwide, minimizing vessel downtime.

10. Can Diesel Pro Power help me choose the right parts for my MG514C?

Yes! Our knowledgeable team offers technical support, product selection assistance, and installation guidance to ensure you get the correct parts for your Twin Disc MG514C transmission.