April 1, 2025
Introduction
Rear Output Assembly Overview for Twin Disc MG516 Marine Gear
Bearing and Seal Inspection for Twin Disc MG516 Marine Gear
When to Inspect the Output Shaft Bearings and Seal
Tools and Supplies Needed
Rear Bearing Types and Function
How to Inspect Output Shaft Bearings
When to Replace Bearings
Output Shaft Seal Inspection and Replacement
Signs of Seal Failure
How to Replace the Output Shaft Seal
Preventing Premature Seal Wear
Shaft Alignment and Runout for Twin Disc MG516 Marine Gear
Why Alignment Matters
Measuring Shaft Runout
Shaft Alignment to Propeller Shaft
Real-World Failures Due to Neglected Rear Housing Maintenance
Case Study 1: Tugboat Output Seal Leak
Case Study 2: Vibrating Crew Boat at Cruise Speed
Rear Housing Reassembly Tips
Final Inspection Checklist
Summary: Output Shaft and Rear Housing Maintenance for Twin Disc MG516 Marine Gear
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April 1, 2025
Introduction
Clutch Pack Inspection for Twin Disc MG516 Marine Gear
When to Inspect the Clutch Packs
Tools and Supplies You’ll Need
Accessing the Clutch Packs
Understanding the Clutch Stack
Wear Indicators to Watch For
Measuring Clutch Pack Clearance
Reassembly Tips
Break-In Procedure for New Clutches
Gear Train and Tooth Wear Inspection for Twin Disc MG516 Marine Gear
When to Inspect Gears
Components in the Gear Train
Gear Tooth Wear Types and Identification
How to Inspect Gear Condition
Gear Pitch and Contact Pattern Testing
Measuring Gear Backlash in Twin Disc MG516 Marine Gear
Tools Required
Measurement Procedure
Typical Backlash Tolerance
What Causes Backlash Problems?
Gear and Shaft Inspection Best Practices
Shaft Endplay Measurement
Bearing and Race Inspection
Rebuilding the Gear Train
Real-World Gear Failure Examples
Case Study 1: Offshore Crew Boat with Metallic Noise
Case Study 2: Trawler with Gearbox Overheating
Maintenance Intervals for Gear and Clutch Inspection
Final Inspection Checklist
Summary: Why Clutch and Gear Inspection Matters
Videos About Twin Disc Transmissions
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April 1, 2025
Introduction
Overview of the Hydraulic System in MG516 Marine Gear
Checking Operating Pressure for Twin Disc MG516 Marine Gear
When to Perform a Pressure Test
Tools Needed
Step-by-Step Procedure to Check Hydraulic Pressure
Slow engagement = worn clutch piston seals or pressure leak
What Pressure Deviations Mean
After Testing
Replacing Hydraulic Seals for Twin Disc MG516 Marine Gear
Common Hydraulic Seals in the MG516
Symptoms of Failing Hydraulic Seals
Tools and Supplies for Seal Replacement
General Replacement Procedure (Clutch Piston Seals)
Preventative Tips for Extending Seal Life
Advanced Troubleshooting and Diagnostics For Twin Disc MG516 Marine Gears
Real-World Scenarios
Example 1: Tugboat with Delayed Reverse Engagement
Example 2: Crew Boat Overheating in Forward Gear
Final Checklist After Servicing Hydraulic System
Summary: Servicing the Hydraulic System in MG516 Marine Gear
Videos About Twin Disc Transmissions
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April 1, 2025
Introduction
Draining Procedures for Twin Disc MG516 Marine Gear
Tools and Supplies You’ll Need
Step-by-Step Draining Instructions
Refilling Procedures for Twin Disc MG516 Marine Gear
Recommended Oil Type
Step-by-Step Refilling Instructions
Troubleshooting Refill Problems
⚠️ Overfilled Oil
⚠️ Underfilled Oil
⚠️ Milky or Cloudy Oil
⚠️ Foamy Oil
Safety Tips and Best Practices
Maintenance Enhancements
Environmental Responsibility
Summary: Drain and Refill for Long-Term Reliability
Videos About Twin Disc Transmissions
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April 1, 2025
Introduction
Oil Change Intervals for Twin Disc MG516 Marine Gear
Recommended Oil Change Intervals
Best Practices for Changing Oil
1. Warm Up the Transmission First
2. Use a Clean Catch Pan with High Capacity
3. Access the Drain Plug Safely
4. Inspect the Magnetic Plug
5. Replace Sealing Washer
6. Fill with Correct Oil
7. Check Level with Dipstick or Sight Glass
8. Log the Service
Filter Element Replacement for Twin Disc MG516 Marine Gear
Types of Filters Used
Filter Replacement Interval
Filter Replacement Procedure
1. Locate the Filter Housing
2. Prepare for Fluid Loss
3. Remove the Old Filter
4. Inspect O-Ring Surface
5. Prime the New Filter
6. Install the New Filter
7. Check for Leaks After Startup
Visual Inspection Checklist for Twin Disc MG516 Marine Gear
Suggested Inspection Frequency
External Inspection Points
Oil Leaks
Housing Cracks or Corrosion
Flange and Coupling Bolts
Oil Cooler and Lines
Mounting Bolts and Isolation Bushings
Internal Clues (Non-Invasive)
Documentation and Record-Keeping
Advanced Preventative Checks
1. Shaft Runout Measurement
2. Hydraulic Pressure Testing
3. Infrared Temperature Scan
Seasonal Maintenance Tips
Common Maintenance Mistakes to Avoid
Maintenance Supplies Checklist
Summary
Videos About Twin Disc Transmissions
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April 1, 2025
Introduction
Essential PPE Items
Inspection and Maintenance of PPE
Lockout/Tagout (LOTO) Procedures for Twin Disc MG516 Marine Gear
Why LOTO Is Critical for Marine Gears
Step-by-Step Lockout/Tagout Procedure
Recommended Tools for Twin Disc MG516 Marine Gear Service
Basic Hand Tools
Hydraulic Service Tools
Diagnostic Tools
Heavy Lifting and Support Tools
Seal and Gasket Tools
Cleaning and Preparation Supplies
Tool Storage and Maintenance
Shop Setup Recommendations
What Not to Use
Summary: Safety and Tooling for MG516 Work Done Right
Videos About Twin Disc Transmissions
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