Free - Twin Disc MG-527 Troubleshooting Guide

Twin Disc MG 527 Marine Transmission Parts

-
Select Parts Category

Free - Twin Disc MG-527 Troubleshooting Guide

Twin Disc MG527 Marine Transmission Parts Catalog

Introduction: Trusted Power and Reliability for Marine Operations

The Twin Disc MG527 marine transmission is designed for durability, reliability, and smooth power transfer in demanding marine environments. Whether you operate a fishing boat, offshore support vessel, tugboat, workboat, or recreational craft , the MG527 is engineered to deliver consistent performance under a wide range of operational conditions.

At Diesel Pro Power , we offer a comprehensive selection of MG527 parts , including rebuilt transmissions, overhaul plate kits, gasket sets, plate kits, rubber blocks, and oil pump and filter assemblies . Our commitment to quality, combined with 24-hour worldwide shipping and expert support , ensures your MG527 transmission stays in peak condition with minimal downtime.

Rebuilt Twin Disc MG527 Marine Transmissions for Sale

Our rebuilt Twin Disc MG527 marine transmissions are meticulously reconditioned to meet or exceed OEM standards , ensuring long-lasting performance and smooth operation. Each transmission is carefully disassembled, inspected, and rebuilt with high-quality components, followed by rigorous testing to ensure optimal functionality.

Every rebuilt MG527 transmission includes essential components:

Mechanical selector valve assembly (control valve) for smooth and precise gear engagement.
Pilot housing flange for secure engine connection.
Oil pump for continuous lubrication and reduced wear on internal components.
Oil level gauge for easy monitoring of fluid levels.
Output flange for reliable power transfer to the propeller shaft.

Note: Drive ring is sold separately. All rebuilt MG527 transmissions are sold with a refundable core deposit. See details for more information.

Available Gear Ratios:

Twin Disc MG527 Marine Transmission 2.0:1 for Sale

The 2.0:1 ratio is ideal for vessels that require a balance of speed and torque, such as mid-sized commercial fishing boats, workboats, and recreational craft . This ratio ensures smooth cruising capabilities while maintaining strong thrust for moderate loads and operational conditions. It’s an excellent choice for operators who need versatility and fuel efficiency without compromising performance.

Twin Disc MG527 Marine Transmission 3.0:1 for Sale

The 3.0:1 ratio provides enhanced torque for larger vessels, utility boats, and offshore supply vessels that require steady power and control under varying load conditions. This ratio is designed for applications where vessels handle heavier cargo, towing operations, or challenging marine environments . The added torque ensures reliable performance and efficient propulsion, even under demanding conditions.

Twin Disc MG527 Marine Transmission 4.0:1 for Sale

The 4.0:1 ratio is engineered for heavy-duty applications , including trawlers, cargo vessels, and offshore support vessels . It delivers substantial torque and control , making it an ideal choice for operators who prioritize powerful propulsion and precise handling. This ratio ensures smooth operation during extended periods of heavy load and in conditions where consistent performance is crucial.

Twin Disc MG527 Marine Transmission 5.0:1 for Sale

The 5.0:1 ratio offers maximum torque and exceptional control , perfect for the most demanding marine operations. This ratio is well-suited for tugboats, dredging vessels, and large commercial vessels that require high pulling power, low-speed control, and excellent maneuverability . With the 5.0:1 ratio, you’ll experience reliable, powerful propulsion, even in rough seas or when handling oversized loads.

Our Selection of Twin Disc MG527 Parts

Rebuilt Gear – For Twin Disc MG527 Transmission

Our rebuilt MG527 transmissions are thoroughly reconditioned to OEM specifications, ensuring reliable performance and extended service life. Each rebuilt unit undergoes complete disassembly, inspection, precision reassembly with premium components, and comprehensive testing to ensure optimal functionality. Rebuilt transmissions come with essential components such as the mechanical selector valve assembly, pilot housing flange, oil pump, oil level gauge, and output flange (drive ring sold separately, refundable core deposit applies).

Overhaul Plate Kit – For Twin Disc MG527 Transmission

The overhaul plate kit includes all necessary brass friction plates and steel plates for a complete clutch rebuild, restoring smooth engagement and consistent performance. Designed for long-lasting durability, this kit is ideal for scheduled maintenance and major overhauls.

Gasket Set – For Twin Disc MG527 Transmission

Our complete gasket set features main housing gaskets, O-rings, seal rings, and auxiliary gaskets , ensuring a leak-free seal and maintaining system integrity during maintenance or overhauls. Made from high-quality materials to withstand the harshest marine environments.

Plate Kit – For Twin Disc MG527 Transmission

A selection of individual brass and steel plates for targeted clutch system repairs, allowing you to replace worn or damaged components without a full overhaul kit. Crafted to OEM standards, these plates ensure smooth operation and reliable performance.

Rubber Blocks (Couplings) – For Twin Disc MG527 Transmission

The rubber block , also known as a torsional isolator, connects the transmission output flange to the propeller shaft, absorbing vibrations, reducing stress on the drivetrain, and compensating for misalignments. Made from durable, marine-grade materials for reliable performance and extended lifespan.

Oil Pump and Filter – For Twin Disc MG527 Transmission

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

Why Choose Diesel Pro Power for MG527 Parts?

24-Hour Worldwide Shipping: Quick processing and shipping ensure minimal downtime for your vessel.
Comprehensive Inventory: Extensive selection of MG527 parts in stock and ready for dispatch.
Expert Customer Support: Our knowledgeable team offers guidance on part selection, installation, and troubleshooting.
Over 15,000 Satisfied Customers: Trusted worldwide by marine professionals and operators for high-quality parts and excellent service.
Easy Online Shopping: Our user-friendly website makes it easy to browse, select, and order the parts you need from the comfort of your home or office.

Frequently Asked Questions (FAQs) about the Twin Disc MG527

1. What types of vessels use the MG527 transmission?

The MG527 is used in fishing boats, offshore support vessels, tugboats, workboats, and recreational vessels , providing reliable performance and smooth power transfer.

2. What essential parts should I keep on hand for MG527 maintenance?

Key components 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?

The kit includes all brass friction plates and steel plates for a complete clutch rebuild, ensuring consistent engagement and smooth operation.

4. How fast can I get MG527 parts from Diesel Pro Power?

Orders are typically processed and shipped within 24 hours , with fast worldwide shipping available.

5. Are Diesel Pro’s aftermarket parts reliable?

Absolutely! Our parts meet or exceed OEM standards, providing reliable and durable performance.

6. How do I know which parts I need for my MG527?

Our website is designed to make it easy to find parts for your specific engine model. Our expert customer support team is also available for guidance.

7. What are signs that my MG527 transmission needs maintenance?

Look for fluid leaks, unusual noises, slipping gears, overheating, or reduced performance , all of which may indicate the need for service.

8. Do you offer technical support?

Yes! Our knowledgeable team provides expert advice, troubleshooting, and installation guidance for all MG527 parts.

9. Can I shop for other Twin Disc parts?

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 MG527 parts catalog , select your items, and complete your order securely online. Contact us if you have questions or need assistance.

Order Twin Disc MG527 Parts Today

Choose Diesel Pro Power as your trusted supplier for Twin Disc MG527 marine transmission parts . With fast shipping, competitive pricing, and expert support, we make it easy to keep your MG527 transmission running smoothly and efficiently.

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).

Marine Transmission Specifications & Applications of the Twin Disc MG527

Overview of the Twin Disc MG527 Marine Transmission

The Twin Disc MG527 is a heavy-duty marine transmission engineered for vessels that demand high torque handling, long hours of operation, and dependable gear engagement. Designed to operate under extreme marine conditions, the MG527 offers superior performance in offshore supply vessels, tugboats, large trawlers, and utility workboats.

With its robust design, wide range of reduction ratios, and support for high-horsepower diesel engines, the MG527 is a go-to choice for continuous-duty marine applications. The unit's advanced clutch system, pressure lubrication, and integrated cooling options ensure smooth operation and extended service intervals—even under the most demanding workloads.

Key Specifications of the Twin Disc MG527

Type: Heavy-duty marine transmission with hydraulic clutch
Horsepower Rating (Approximate):

Continuous Duty: Up to 1,250 HP @ 1800 RPM
Intermittent Duty: Up to 1,400 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
4.50:1

Input Housing: SAE No. 0 or SAE No. 1
Flywheel Compatibility: 18", 14"
Clutch Type: Oil-cooled, hydraulically actuated multi-disc clutch
Cooling System: Oil-to-water heat exchanger standard
Lubrication System: Integrated pressure-fed lubrication system
Oil Capacity: Approximately 30–38 quarts
Dry Weight: 1,800–2,200 lbs (depending on ratio and features)
Mounting Options: Straight or 8° down-angle configuration
Rotation Compatibility: Bi-directional (LH and RH engine compatibility)
Optional Features:

Hydraulic or mechanical PTO
Trolling valve
Electronic shift interface
Rigid or flexible mount support

Common Marine Applications for the MG527

The MG527 is ideal for large commercial and industrial marine vessels that require consistent torque, high durability, and compatibility with high-output engines. Typical applications include:

Tugboats and Pushboats: Excellent for heavy-duty propulsion, harbor operations, and inland towing
Offshore Supply Vessels (OSVs): Built to handle long distances, full loads, and auxiliary power needs
Commercial Fishing Trawlers: Withstand prolonged operational hours and gear engagement under load
Dredging and Marine Construction Vessels: Offers reliable PTO support for hydraulic pumps and deck equipment
Anchor Handling and Utility Boats: Strong enough for demanding start-stop cycles and heavy bollard pull

Most Common Engine Models Paired with the Twin Disc MG527

With a power rating that matches high-horsepower marine diesel engines, the MG527 is compatible with a variety of industry-leading propulsion systems:

Cummins Marine Engines

Cummins KTA38-M2
Cummins QSK50 (medium ratings)
These engines are frequently used in tugs and large fishing vessels where MG527 can efficiently transfer torque.

Caterpillar Marine Engines

Caterpillar 3512C
Caterpillar C32 ACERT (high output ratings)
Both engines match the MG527’s capacity and gear ratios for continuous-duty workboats and trawlers.

MTU Marine Engines

MTU 12V4000 Series
MTU 16V2000 (select applications)
Used in advanced propulsion systems and offshore vessels requiring responsive power transfer.

Detroit Diesel Marine Engines

Detroit Diesel 16V92TA
Detroit Diesel 16V149
Legacy engine pairings common in refit vessels where MG527 provides a heavy-duty modern transmission upgrade.

Advantages of the Twin Disc MG527

High Torque Capacity: Specifically designed for commercial operators who need maximum reliability under load
Multiple Gear Ratios: Optimized for a wide range of vessel speeds and applications
Oil-Cooled Clutch System: Minimizes wear and maximizes service life
Flexible Mounting and Output Options: Straight and down-angle models adapt easily to vessel design constraints
PTO Compatibility: Seamless integration for hydraulic equipment on dredgers, OSVs, and trawlers

Ideal Use Cases for the MG527

Vessel Type	MG527 Suitability	Notes
Tugboats and Pushboats	Excellent	High torque and robust clutching for demanding workloads
Offshore Supply Vessels	Excellent	Endurance and compatibility with high-horsepower diesels
Deep-Sea Trawlers and Fishing Boats	Excellent	Long run-time reliability and effective gear cooling
Marine Construction/Dredgers	Excellent	Integrated PTO options for pumps and support gear
Passenger Ferries or Light Craft	Not Recommended	Oversized for light-duty propulsion needs

Additional Resources

Practical Guide to Servicing the Twin Disc MG527 Marine Gear

Introduction: Why Proper Service Matters for the Twin Disc MG527 Marine Gear

Overview of the MG527’s role in marine propulsion systems
Importance of routine maintenance for longevity and performance
Brief summary of what this guide covers
Disclaimer: For torque values, rebuild steps, and more technical data, always refer to the OEM service manual

Understanding the Twin Disc MG527 Marine Gear

Key Specifications and General Overview

Input power, RPM ratings, and torque capacity
Gear ratios available
Applications in commercial and recreational vessels

Component Layout and Function

Brief walkthrough of the MG527’s major components
Role of the hydraulic clutch, reduction gearing, and control valve

Tools and Safety Equipment Needed for Servicing the MG527

Required Tools

Basic hand tools
Torque wrenches
Alignment tools
Specialty tools (if applicable)

Personal Protective Equipment (PPE)

Gloves, safety goggles, steel-toed boots
Oil-resistant clothing
Fire extinguisher near the work area

Routine Maintenance Checklist for the Twin Disc MG527 Marine Gear

Daily/Pre-Trip Inspections

Oil level checks
Visual inspection for leaks
Shift engagement and operational feel

Scheduled Maintenance (250, 500, 1000-hour intervals)

Oil change intervals and type of oil
Filter inspections and replacements
Bolt torque checks
Heat exchanger flushing and cleaning

Servicing the Hydraulic System For The Twin Disc MG527 Marine Gear

Hydraulic Pressure Checks

Proper test points
Acceptable pressure ranges

Hydraulic Clutch Inspection and Adjustment

Signs of wear
Proper clearance and pressure plate inspection

Inspection and Service of the Output Shaft and Bearings For The Twin Disc MG527 Marine Gear

Bearing Wear Inspection

Vibration signs
How to remove and inspect bearings safely

Output Shaft Seal Replacement

Common signs of wear (oil seepage, noise)
Step-by-step replacement overview (without breaching copyright)

Gearbox Disassembly and Reassembly Overview For The Twin Disc MG527 Marine Gear

Refer to OEM service manual for full disassembly/reassembly instructions

Preparatory Steps

Draining oil
Tagging lines and connectors

Accessing Internal Components

Removing covers, couplings, and linkages
Safety tips for handling heavy parts

Reassembly Best Practices

Cleanliness and proper lubrication
Bolt torque importance

Adjustments and Calibration Procedures For The Twin Disc MG527 Marine Gear

Shift Timing Adjustment

Proper shifting speed and timing for smooth operation

Control Cable and Linkage Calibration

Ensuring full travel and no slack
Lubrication of control linkage

Common Issues and Troubleshooting the Twin Disc MG527 Marine Gear

Slipping or Delayed Engagement

Potential causes (low pressure, worn clutches)
Quick diagnosis checklist

Success!