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The Twin Disc MG5091 marine transmission is trusted by vessel operators for its robust design, smooth power transfer, and long-lasting performance. Built for a variety of marine applications—including fishing boats, workboats, offshore supply vessels, and recreational yachts—the MG5091 is engineered to meet the rigorous demands of marine propulsion systems. At Diesel Pro Power, we offer a complete range of MG5091 parts to keep your transmission operating at peak efficiency. Whether you need parts for routine maintenance, a major overhaul, or a complete rebuild, we’ve got you covered with fast shipping and expert support. At Diesel Pro Power, we offer a range of rebuilt Twin Disc MG5091 marine transmissions, each meticulously remanufactured to meet OEM specifications. These transmissions are available in various gear ratios to suit different vessel requirements: Ideal for high-speed vessels such as patrol boats and fast ferries, the 1.5:1 ratio provides a balance between speed and torque. This configuration is suitable for applications where rapid acceleration and higher cruising speeds are essential. The 1.7:1 ratio offers a versatile balance between speed and power, making it suitable for a variety of vessels, including commercial fishing boats and recreational crafts. This ratio ensures efficient fuel consumption while maintaining adequate thrust. Designed for vessels requiring more torque, the 2.0:1 ratio is commonly used in workboats and utility vessels. This configuration provides enhanced pulling power, making it ideal for towing and heavy-duty operations. The 2.5:1 ratio is tailored for heavy-duty applications where maximum torque is necessary. This setup is often found in tugboats and larger fishing vessels, ensuring reliable performance under substantial loads. Offering a balance between speed and torque, the 3.0:1 ratio is suitable for vessels that require moderate thrust and speed, such as mid-sized commercial boats. The 3.5:1 ratio provides increased torque for heavier vessels, such as cargo boats and larger fishing vessels. This configuration ensures reliable performance under substantial loads. Engineered for applications needing high thrust at lower speeds, including trawlers and utility boats, the 4.0:1 ratio offers enhanced durability and torque capacity. Provides substantial torque and excellent control for heavy-duty commercial vessels. The 4.5:1 ratio ensures reliable performance under high-load conditions, making it a preferred choice for demanding operations. Delivers maximum torque and control for the most challenging applications, including tugboats and heavy-duty commercial vessels. The 5.0:1 ratio supports continuous heavy-load performance and long-term durability. Each rebuilt transmission includes essential components such as the mechanical selector valve assembly, pilot housing flange, oil pump, oil level gauge, and output flange. Please note that the drive ring is sold separately. By selecting the appropriate gear ratio for your vessel's specific needs, you can optimize performance, fuel efficiency, and operational reliability. Our overhaul plate kit includes all brass friction plates and steel plates necessary for a full clutch rebuild. Engineered for durability, this kit restores smooth clutch engagement and prolongs the life of your transmission. Includes main housing gaskets, O-rings, seal rings, and auxiliary gaskets to ensure a leak-free seal during overhauls or maintenance, preventing fluid leaks and maintaining performance. The bearing kit features precision-engineered bearings designed to reduce friction, support shaft alignment, and ensure quiet, efficient operation. Essential for restoring system tolerances and preventing leaks, our ring kit includes sealing and retaining rings for a complete rebuild. Individual brass friction plates and steel plates are available for targeted repairs, maintaining clutch performance without needing a full kit. The rubber block absorbs vibrations and compensates for shaft misalignments, reducing stress on the drivetrain and improving comfort and longevity. High-quality input and output shaft seals ensure internal pressure and fluid integrity, preventing contamination and wear on internal components. Keeps oil circulating and clean, protecting gears, bearings, and other components from damage and wear. Accurately monitor oil pressure, temperature, and other system parameters, helping operators detect issues early and maintain peak performance. Regulates transmission temperature to prevent overheating and prolong component life. Built from corrosion-resistant materials for reliable marine performance. Overview of Twin Disc MG-5091 Marine Transmission Importance of preventive maintenance and proper repair practices Use of premium aftermarket parts to reduce downtime Disclaimer: Refer to OEM service manual (SM-259) for full technical specs Weight Dimensions Gear Ratios Input Power Rating Rotation Direction Where to locate it How to interpret it Gloves, goggles, and protective clothing Safe lifting techniques Lockout/tagout procedure Proper ventilation and workspace cleanliness Mounting flange condition Alignment checks Shaft runout inspection Soft foot correction Coupling alignment methods Bolt torque specifications Oil level check Filter inspection Monitoring gauges Normal operating temperature Oil pressure ranges Noise and vibration limits Viscosity requirements Compatible brands Initial break-in period Regular change schedule Filter replacement process Inspection tips Oil level Visual inspections Leak checks Coupling checks Alignment re-checks Oil sample analysis Gear slippage Overheating Abnormal noise Loss of oil pressure Tools required How to isolate issues Pullers, dial indicators, torque wrenches Draining fluid Gear housing removal Input/output shaft removal Wear patterns Backlash measurement Shaft endplay Parts washing Inspection before reuse Recommended sealants Pre-lube techniques Bolt torques Function tests Clutch plates Bearings Gaskets and seals What’s included in the kit Using Diesel Pro Power aftermarket kits Flange bolts Cover bolts Shaft nuts Shaft runout Gear backlash Endplay Draining procedures Rust inhibitors Recommended checks before restarting
Twin Disc MG 5091 Marine Transmission Parts for Sale
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Introduction: Smooth, Reliable Power for Marine Applications
Rebuilt Twin Disc MG5091 Marine Transmissions: Gear Ratios and Applications
Twin Disc MG5091 Marine Transmission 1.5:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 1.7:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 2.0:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 2.5:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 3.0:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 3.5:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 4.0:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 4.5:1 – Rebuilt for Sale
Twin Disc MG5091 Marine Transmission 5.0:1 – Rebuilt for Sale
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Essential MG5091 Parts for Maintenance and Overhaul
Overhaul Plate Kit – For Twin Disc MG5091 Transmission
Gasket Set – For Twin Disc MG5091 Transmission
Bearing Kit – For Twin Disc MG5091 Transmission
Ring Kit – For Twin Disc MG5091 Transmission
Plate – For Twin Disc MG5091 Transmission
Rubber Block (Coupling) – For Twin Disc MG5091 Transmission
Seal – For Twin Disc MG5091 Transmission
Oil Pump & Filter – For Twin Disc MG5091 Transmission
Gauges – For Twin Disc MG5091 Transmission
Oil Cooler – For Twin Disc MG5091 Transmission
Additional Resources
Practical Guide Outline for Twin Disc MG-5091 Marine Gear
Introduction for Twin Disc MG-5091 Marine Gear
Specifications and Identification for Twin Disc MG-5091 Marine Gear
Gearbox Specifications for Twin Disc MG-5091 Marine Gear
Serial Number Identification for Twin Disc MG-5091 Marine Gear
Safety Guidelines for Twin Disc MG-5091 Marine Gear
Personal Protective Equipment (PPE) for Twin Disc MG-5091 Marine Gear
Safe Maintenance Practices for Twin Disc MG-5091 Marine Gear
Installation Procedures for Twin Disc MG-5091 Marine Gear
Pre-Installation Inspection for Twin Disc MG-5091 Marine Gear
Alignment and Mounting for Twin Disc MG-5091 Marine Gear
Operating Instructions for Twin Disc MG-5091 Marine Gear
Startup Checklist for Twin Disc MG-5091 Marine Gear
Operating Parameters for Twin Disc MG-5091 Marine Gear
Lubrication and Fluid Guidelines for Twin Disc MG-5091 Marine Gear
Approved Oil Types for Twin Disc MG-5091 Marine Gear
Oil Change Intervals for Twin Disc MG-5091 Marine Gear
Oil Filter Maintenance for Twin Disc MG-5091 Marine Gear
Routine Maintenance Schedule for Twin Disc MG-5091 Marine Gear
Daily Checks for Twin Disc MG-5091 Marine Gear
Weekly Tasks for Twin Disc MG-5091 Marine Gear
Monthly/Quarterly Tasks for Twin Disc MG-5091 Marine Gear
Troubleshooting Guide for Twin Disc MG-5091 Marine Gear
Common Symptoms and Probable Causes for Twin Disc MG-5091 Marine Gear
Diagnostic Tips for Twin Disc MG-5091 Marine Gear
Disassembly and Inspection for Twin Disc MG-5091 Marine Gear
Tools Required for Twin Disc MG-5091 Marine Gear
Disassembly Tips for Twin Disc MG-5091 Marine Gear
Inspection Points for Twin Disc MG-5091 Marine Gear
Reassembly Procedures for Twin Disc MG-5091 Marine Gear
Cleaning and Preparation for Twin Disc MG-5091 Marine Gear
Gasket and Seal Installation for Twin Disc MG-5091 Marine Gear
Final Assembly and Testing for Twin Disc MG-5091 Marine Gear
Parts Replacement Guide for Twin Disc MG-5091 Marine Gear
Commonly Replaced Components for Twin Disc MG-5091 Marine Gear
Rebuild Kit Options for Twin Disc MG-5091 Marine Gear
Technical Torque Specs and Tolerances for Twin Disc MG-5091 Marine Gear
Torque Settings for Twin Disc MG-5091 Marine Gear
Tolerances for Twin Disc MG-5091 Marine Gear
Storage and Preservation for Twin Disc MG-5091 Marine Gear
Long-Term Storage for Twin Disc MG-5091 Marine Gear
Seasonal Layup for Twin Disc MG-5091 Marine Gear
50 Frequently Asked Questions (FAQ) for Twin Disc MG-5091 Marine Gear
Frequently Asked Questions (FAQs) about the Twin Disc MG5091
1. What vessels commonly use the Twin Disc MG5091?
The MG5091 is used in commercial fishing boats, offshore supply vessels, trawlers, workboats, and recreational yachts, offering smooth, reliable power transfer.
2. What essential parts should I keep on hand for my MG5091?
Key components include the overhaul plate kit, gasket set, bearing kit, ring kit, plate, coupling, seal, oil pump & filter, gauges, and oil cooler.
3. What’s included in the overhaul plate kit?
It contains all brass friction plates and steel plates needed for a complete clutch rebuild, ensuring smooth engagement and extended service life.
4. How do I know when to replace the rubber block?
Replace it if you notice increased vibrations, unusual noises, or visible signs of wear or cracking during inspections.
5. How often should I change the oil and filter in the MG5091?
Change the oil and filter every 500 hours of operation or annually, whichever comes first, to maintain optimal performance and reduce wear.
6. What type of oil is recommended for the MG5091?
Use SAE 30W engine oil for temperatures between 150°F and 185°F, and SAE 40W oil for 185°F to 210°F.
7. Are Diesel Pro’s aftermarket parts reliable for the MG5091?
Yes! Our aftermarket parts are designed to meet or exceed OEM standards, providing long-lasting performance at a competitive price.
8. How fast can I get MG5091 parts from Diesel Pro Power?
Orders are typically processed within 24 hours, with fast worldwide shipping to minimize downtime.
9. What signs indicate my MG5091 needs maintenance or overhaul?
Look for slipping gears, fluid leaks, increased vibrations, unusual noises, overheating, or decreased performance.
10. Can Diesel Pro Power help me select the right parts for my MG5091?
Absolutely! Our team offers expert technical support, part selection assistance, and installation guidance for all your MG5091 needs.
