April 2, 2025
Key Specifications for Twin Disc MG5114A Marine Gear
Rated Horsepower and Torque Capacity
Input Speed and Reduction Ratios
Weight and Dimensions
Mounting Configurations and Rotation
Component Overview for Twin Disc MG5114A Marine Gear
Input Shaft and Damper Coupling
Clutch Assemblies (Forward and Reverse)
Gear Train (Helical Gear Arrangement)
Output Shaft and Companion Flange
Hydraulic System and Oil Pump
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April 2, 2025
Overview of the Twin Disc MG-5114A Marine Transmission
Common Applications
Tugboats
Commercial Fishing Vessels
Crew Boats and Pilot Boats
Towboats and Pushboats
Utility and Dredging Vessels
Importance of Proper Servicing and Preventive Maintenance
Oil and Filter Changes
Visual Inspections
Gear Engagement Testing
Oil Cooler and Cooling Lines
Scheduled Rebuilds
Disclaimers
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April 2, 2025
Key Specifications For Twin Disc MG5114A Marine Gear
Component Overview For Twin Disc MG5114A Marine Gear
Personal Protective Equipment (PPE)
Safe Handling and Installation Practices
Hazard Identification and Mitigation
Daily Checks
Weekly Maintenance
Monthly Maintenance
Annual or Hour-Based Intervals
Recommended Lubricants and Fluid Specs
Oil Change Procedure
Hydraulic Pressure Checks
Hard Shifting or No Engagement
Slipping in Forward or Reverse
Abnormal Noise or Vibration
Oil Leaks
Removal Procedure For Twin Disc MG5114A Marine Gear
Installation Procedure For Twin Disc MG5114A Marine Gear
Clutch Pack Inspection
Gear Teeth and Bearing Condition
Output Shaft and Oil Seals
Control Valve and Actuator Functions
Oil Pump Functionality
Servicing the Valve Body
Most Common Replacement Parts
Recommended Rebuild Kits
Complete Rebuilt Transmissions
Proper Storage Practices
Shipping Considerations
Off-Season Maintenance
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April 1, 2025
1. What is the Twin Disc MG520 marine gear?
2. What kind of vessels use the MG520?
3. Is the MG520 suitable for recreational marine use?
4. What is the gear ratio for the MG520?
5. Where is the serial number located on a Twin Disc MG520?
6. What kind of oil does the MG520 use?
7. How often should I change the oil in the MG520?
8. What are the signs of clutch plate wear?
9. Can I rebuild the MG520 myself?
10. How do I know which rebuild kit is right for my MG520?
11. What’s included in a typical MG520 rebuild kit?
12. How do I know when it’s time for an overhaul?
13. Can Diesel Pro Power help me identify the right parts?
14. Is the MG520 transmission reversible?
15. How do I check the oil level in the MG520?
16. What’s the most common failure on the MG520?
17. Can I use synthetic oil in the MG520?
18. What causes metal shavings in MG520 oil?
19. Can I just replace a single clutch plate?
20. Where can I buy MG520 parts online?
21. Do you offer international shipping?
22. How long does a full rebuild take?
23. Do I need special tools for rebuilding the MG520?
24. How much oil does the MG520 hold?
25. What are common torque specs for MG520 fasteners?
26. How do I flush the MG520 transmission?
27. What causes MG520 overheating?
28. How do I align the MG520 to the engine?
29. Can I use MG514C parts in an MG520?
30. What’s the warranty on Diesel Pro MG520 parts?
31. What’s the difference between MG520 and MG520-1?
32. How often should I inspect the clutch assembly?
33. How do I identify a worn bearing?
34. Should I replace seals during every oil change?
35. Can I convert the MG520 for different gear ratios?
36. Is there a difference between forward and reverse clutches?
37. How do I test for internal clutch pressure?
38. What tools do I need to install the MG520?
39. Can I reuse old clutch plates if they look good?
40. Does the MG520 have a filter or strainer?
41. How do I know if the oil cooler is working?
42. Can MG520 parts be sourced from local dealers?
43. Can I run the MG520 without a load for testing?
44. Can I install the MG520 vertically or at an angle?
45. What happens if I overfill the MG520?
46. Can I run a MG520 on land without a shaft?
47. Where can I find videos on MG520 repairs?
48. Do you sell complete rebuilt MG520 transmissions?
49. What’s the cost of a full rebuild vs replacement?
50. Where can I get more help?
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April 1, 2025
Introduction: Why Support Matters
Technical Support
Trusted Help for MG520 Troubleshooting and Parts
When to Seek Technical Support
Diesel Pro Power Technical Support
Ways to Contact Diesel Pro Power:
What Diesel Pro Power Can Help You With:
When to Consult a Professional Marine Technician
Knowing When to Call in a Pro
Signs You Need a Marine Transmission Technician:
Tasks That Typically Require a Marine Technician:
Advantages of Hiring a Qualified Technician:
A Step-by-Step Guide
Step 1: Use Diesel Pro Power’s Referral Network
Step 2: Search by Specialization
Step 3: Verify Experience Before Hiring
Step 4: Contact Boat Yards and Marinas
Step 5: Use Online Marine Communities
The Twin Disc MG520 Service Manual
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April 1, 2025
Introduction to Preventive Maintenance
Why It Matters for Twin Disc MG520 Marine Gear
Recommended Service Intervals For Twin Disc MG520 Marine Gears
1. Daily or Every 8 Hours of Operation
2. Every 250 Hours or Monthly
3. Every 1,000 Hours or Quarterly
4. Every 2,000–3,000 Hours or Annually
5. Every 5,000–7,000 Hours or 3–5 Years
Oil Changes For Twin Disc MG520 Marine Gears
Protecting the Lifeblood of Your Marine Gear
When to Change the Oil
Signs That Oil Needs Changing Sooner
Steps for a Clean Oil Change:
Oil Type Recommendation
Inspections For Twin Disc MG520 Marine Gears
What to Inspect and When
1. Housing and Mounts
2. Input and Output Seals
3. Clutch Plates and Engagement
4. Oil Cooler and Lines
5. Bearings and Vibration
6. Oil Quality
Overhaul Frequency
When and Why to Rebuild the MG520
Suggested Overhaul Timing
Benefits of Scheduled Overhaul
Core Components to Replace During Overhaul
Service Log Templates For Twin Disc MG520 Marine Gears
Staying Organized with Maintenance History
Essential Service Log Entries:
Pro Tips for Record Keeping:
Ensuring Warranty and Resale Value For Twin Disc MG520 Marine Gears
Why Maintenance Logs Matter:
Tips to Maximize Value:
Diesel Pro Power Support
Your Partner in Twin Disc MG520 Marine Gear Preventive Maintenance
Available Support Services:
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Free US Calls: 1-888-433-4735
International: 305-545-5588
