Overview

The Twin Disc MG527 is a powerhouse in marine propulsion, designed to meet the demands of commercial fishing vessels, offshore support boats, workboats, tugs, and other heavy-duty applications. Engineered to handle 427 to 990 horsepower, this transmission delivers reliable performance under the most challenging conditions, with the versatility of multiple gear ratios to match specific vessel requirements. Our rebuilt Twin Disc MG527 units are restored to OEM specifications, fully tested, and available for immediate sale, ensuring operators can count on proven performance and durability.

Twin Disc MG527 Ratios for Sale

Our rebuilt Twin Disc MG527 units are offered in a range of gear ratios, each meticulously rebuilt and rigorously tested to deliver exceptional performance, durability, and reliability. These gear ratios enable operators to tailor their vessel’s propulsion system to the unique demands of their marine environment and mission profile. With in-stock availability and a refundable core deposit, our rebuilt MG527 transmissions offer a fast and cost-effective solution for high-performance marine propulsion.

Twin Disc MG527 marine transmission ratio 2.00:1 for sale

This ratio delivers a balanced blend of speed and torque, making it an excellent choice for mid-sized commercial fishing boats, workboats, and recreational craft that require both versatility and fuel efficiency. The 2.00:1 ratio ensures smooth cruising speeds while maintaining sufficient thrust under moderate load conditions. It supports vessels operating in a mix of open water and confined spaces, where agility and reliable control are essential. Operators benefit from consistent power delivery and the ability to handle variable load profiles without sacrificing efficiency or maneuverability.

Twin Disc MG527 marine transmission ratio 3.00:1 for sale

Engineered for larger vessels, utility boats, and offshore supply vessels, the 3.00:1 ratio enhances torque output, providing steady control and reliable propulsion under challenging conditions. This configuration excels in applications involving heavier cargo loads, towing operations, or dynamic marine environments where consistent power transfer is critical. The 3.00:1 ratio ensures the transmission maintains optimal efficiency across a wide range of operating conditions, reducing fuel consumption and mechanical stress, while delivering dependable performance during high-demand operations.

Twin Disc MG527 marine transmission ratio 4.00:1 for sale

Purpose-built for heavy-duty operations such as trawlers, cargo vessels, and offshore support vessels, the 4.00:1 ratio maximizes torque output while delivering precise handling. This ratio thrives in high-drag scenarios, including operations in adverse weather conditions, strong currents, or when navigating heavily loaded vessels. With its robust design and precise power delivery, the 4.00:1 ratio ensures smooth and dependable propulsion even during prolonged periods of high load. Operators benefit from reduced wear, enhanced fuel efficiency under load, and superior control in complex marine environments.

Twin Disc MG527 marine transmission ratio 5.00:1 for sale

The highest available ratio for the MG527, the 5.00:1 configuration is designed for tugboats, dredging vessels, and large commercial vessels that require maximum torque, precise low-speed control, and exceptional maneuverability. This ratio excels in operations that demand high pulling power, fine speed adjustments, and reliable control in tight or congested waterways. Whether moving massive loads, managing precision docking, or maintaining steady propulsion in adverse conditions, the 5.00:1 ratio delivers outstanding performance and reliability. Its ability to operate efficiently at low engine speeds also contributes to fuel savings and reduced mechanical wear.

Each rebuilt transmission is in stock, backed by a refundable core deposit, and subjected to a rigorous rebuild and testing process that ensures quality and performance. By offering a comprehensive range of gear ratios, the MG527 can be precisely matched to your vessel’s specific operational requirements, enhancing overall efficiency, performance, and service life. Whether you need a transmission optimized for speed, a balance of speed and torque, or maximum pulling power, our rebuilt MG527 units provide a reliable fit for your marine propulsion needs.

Key Features and Benefits

• Hydraulic, Oil-Controlled Clutch Engagement for smooth gear transitions under load.
• Carburized, Hardened, and Ground Gears for extended service life and low maintenance.
• Emergency Come-Home Feature ensures limited propulsion in the event of clutch failure.
• Jig-Bore Accuracy guarantees precise component alignment, reducing wear and vibration.
• Rubber Block Drive minimizes vibration and absorbs misalignment stresses.
• Dry Flywheel Housing simplifies maintenance and access for inspection and service.
• Clutches Removable with Transmission Installed reduces downtime and facilitates easy maintenance.
• Identical Forward and Reverse Ratios provide consistent propulsion in both directions.

Engine Compatibility for the Twin Disc MG527

The Twin Disc MG527 rebuilt marine transmission is engineered to integrate seamlessly with high-output diesel engines delivering between 427 to 990 horsepower, making it an ideal choice for a broad range of vessel types and operational demands. Selecting the correct engine-transmission pairing is crucial for achieving optimal performance, fuel efficiency, and long-term reliability. Below is an expanded look at key compatible engines from major manufacturers, along with insights into their typical applications and performance benefits.

Caterpillar Engines

• C12: Rated at 345–715 hp, the C12 is renowned for its compact design and reliable performance in fishing vessels, pilot boats, and light workboats. Its durability and fuel efficiency make it a popular choice for operators requiring steady, dependable power with manageable maintenance costs.
  

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• C13: With an output of 385–750 hp, the C13 is widely used in high-speed ferries, pilot vessels, and offshore support boats where a balance of power and efficiency is essential. This engine’s responsive acceleration and high torque output complement the MG527’s capabilities, ensuring smooth operation even under varying load conditions.
  

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• C15: Producing 435–850 hp, the C15 offers a robust power solution for trawlers, utility boats, and larger workboats. Its proven track record in commercial marine applications, coupled with excellent torque delivery, makes it an outstanding match for the MG527 in medium- to heavy-duty applications.
  

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• C18: Delivering up to 1000 hp, the C18 is ideal for offshore supply vessels, large trawlers, and tugs. Its high torque and power density ensure consistent performance, even under sustained high-load conditions. Pairing a C18 with an MG527 ensures reliable propulsion for demanding operations where downtime is not an option.
  

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Cummins Engines

• QSM11: With power output ranging from 300–715 hp, the QSM11 is a versatile engine for mid-duty commercial vessels such as pilot craft, fast ferries, and workboats. Its fuel-efficient performance and compact footprint make it a solid choice for operators prioritizing efficiency without sacrificing power.
  

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• QSK19: Delivering 500–800 hp, the QSK19 is designed for heavy-duty vessels including supply boats, trawlers, and offshore service vessels. Its high torque output and reliable performance, combined with advanced control systems, make it a perfect match for the MG527’s torque handling capabilities.
  

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• KTA19: Rated at 450–700 hp, the KTA19 is a tried-and-tested engine for workboats, patrol boats, and ferriesoperating under continuous or heavy load. Its rugged design ensures consistent operation and extended service life when paired with a transmission like the MG527.
  

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• KTA38: Producing 750–1000 hp, the KTA38 is at the upper limit of the MG527’s capacity, making it ideal for large commercial vessels, dredgers, and offshore support vessels. Its ability to deliver high torque and power under extreme conditions ensures the MG527 operates at peak efficiency and reliability.

Detroit Diesel Engines

• 8V92TA: Providing 350–550 hp, the 8V92TA is a workhorse for mid-sized workboats, fishing vessels, and pilot craft, known for its robust design and field-proven durability. Its torque characteristics complement the MG527’s smooth engagement and power delivery.
  

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• 12V92TA: Offering 525–750 hp, this engine is suitable for larger workboats, supply vessels, and fishing boatsthat require high power and dependable performance. The 12V92TA’s high torque at lower RPMs ensures steady propulsion in challenging marine conditions.
  

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• 16V92TA: With output up to 850 hp, the 16V92TA is built for heavy-duty marine applications including tugs, offshore vessels, and large trawlers. Its excellent power density and reliable performance make it a solid match for the MG527.
  

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• Series 60 (12.7L): Delivering 350–600 hp, the Series 60 offers a blend of power and efficiency ideal for mid-sized marine vessels such as workboats and patrol boats. Its low emissions and fuel economy make it an attractive option for operators focused on environmental impact and operating costs.

SAE Housing Details

• Housing: SAE 0 standard, ensuring compatibility with a wide range of engines. An adapter is available for SAE 00, accommodating larger engines with higher torque demands.
• Certified Installation Print: Drawing X9664-G provides detailed installation specifications, including torque requirements and alignment procedures to ensure secure mounting.
• Approximate Dry Weight: 998 kg (2,200 lbs), requiring appropriate lifting equipment and vessel structural support during installation.
• Mounting Dimensions: Length: 850.9 mm (33.50 in); Height: 528.6 mm (20.81 in); Width: 228.6 mm (9.0 in), designed for easy integration into a variety of engine rooms.
  

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Duty Classification Performance Information

This expanded section reinforces the importance of matching the right engine with the MG527 transmission to ensure optimal performance, reliability, and service life in demanding marine environments.

Installation and Maintenance

Proper installation and diligent maintenance of the Twin Disc MG527 are essential to ensure optimal performance, longevity, and safety. Below is an expanded guide highlighting key procedures, best practices, and considerations for vessel operators and maintenance teams:

• Certified Installation Print X9664-G: This document provides precise specifications for aligning the transmission with the engine flywheel housing, ensuring correct torque application and secure mounting. Precise alignment is critical to prevent premature wear, reduce vibration, and maintain optimal power transfer efficiency. It is recommended that installation is performed by qualified marine mechanics familiar with SAE housing standards and the specific requirements of the MG527.
  

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• Cooling Systems: Maintaining optimal transmission temperature is crucial for reliability and performance. Use the correct heat exchanger kit—Kit K-98 for fresh water cooling or Kit K-99 for raw water cooling—to effectively manage heat dissipation. Regularly inspect coolant lines, check coolant levels, and flush the system as needed to prevent clogs or scaling that can lead to overheating. For vessels operating in warmer waters or under continuous high load, more frequent system checks are advised.
  

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• Routine Maintenance: Implement a proactive maintenance schedule that includes timely oil changes with high-quality lubricants specified by Twin Disc. Replace oil filters at recommended intervals to maintain clean lubrication and prevent debris buildup. Periodically inspect clutch plates for signs of wear or slippage, replace seals and gaskets to prevent leaks, and monitor overall alignment to reduce drivetrain stress. Document all maintenance activities and use OEM replacement parts to ensure optimal performance.
  

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• Handling Precautions: The MG527’s dry weight of approximately 998 kg (2,200 lbs) necessitates the use of certified lifting equipment, such as cranes or hoists, with proper lifting attachments or slings to avoid damage during installation or removal. Confirm that the vessel’s support structures are adequately rated to bear the transmission’s weight during handling and installation. Take care to avoid sudden impacts or misalignment that can cause long-term stress on transmission components.
  

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• Pre-Installation Checks: Prior to installation, inspect the transmission thoroughly for shipping damage, verify that all mounting surfaces are clean and free of debris, and confirm that coupling components align correctly with the engine’s flywheel housing. Double-check torque settings, lubrication levels, and connection points as per the certified print.
  

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• Post-Installation Testing: Once installed, perform operational checks under low load conditions to ensure proper gear engagement, smooth shifting, and accurate clutch response. Monitor oil pressure, temperature, and vibration levels during initial operation, and adjust system settings as necessary before moving to full load operations.

Service Classifications

Understanding the appropriate service classification for your vessel helps determine the correct maintenance intervals, performance expectations, and load management:

• Continuous Duty: This classification applies to vessels operating continuously at full power, such as tugs, ferries, and offshore supply vessels. Continuous duty demands rigorous maintenance schedules, including more frequent oil changes, coolant checks, and inspections of load-bearing components. Transmissions under continuous duty are exposed to sustained thermal and mechanical stress, making regular system monitoring crucial.
  

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• Intermediate Duty: Vessels such as fishing boats, pilot craft, and patrol vessels fall into this category, characterized by high-power operation interspersed with periods of reduced load. While not as demanding as continuous duty, intermediate duty still requires careful attention to maintenance schedules and operational monitoring, especially during high-load periods.
  

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• Pleasure Craft: This classification covers recreational vessels, high-speed yachts, and planing hulls that operate at high power for short bursts rather than sustained loads. Although these vessels may have lower total operating hours, the high stress levels during bursts of power necessitate regular checks on clutches, seals, and cooling systems. Preventive maintenance is key to ensuring reliability for each outing.
  

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Important Notice

The performance data and product information provided are intended as general guidelines. Diesel Pro Power assumes no responsibility for system-related issues, failures, or damage resulting from improper selection, installation, or maintenance of rebuilt transmissions. It is the responsibility of the purchaser and installer to ensure compliance with all applicable safety standards, proper engineering practices, and vessel-specific requirements. Always consult with qualified marine engineers or technicians to verify compatibility and ensure correct installation of the Twin Disc MG527 in your vessel.

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