April 8, 2025
Identifying Signs of Wear For Allison M & MH Marine Transmissions
Common Indicators of Gear and Bearing Wear
Disassembly Prep and Safety For Allison M & MH Marine Transmissions
Tools and Materials Needed
Safety Best Practices
Work Area Setup
Gear Inspection Tolerances For Allison M & MH Marine Transmissions
Key Gear Types in Allison M & MH Transmissions
Inspection Checklist
Visual Examination
Backlash Measurement
Runout Testing
Tooth Pattern Contact
Hardness Testing (optional)
Bearing Removal and Press-Fit Install For Allison M & MH Marine Transmissions
Bearing Removal Procedures
Bearing Installation Procedures
Rechecking Alignment and Backlash For Allison M & MH Marine Transmissions
Shaft and Gear Alignment Checks
Torque Final Hardware
Post-Rebuild Pressure Test
Test Run with Load
Final Notes On Inspecting and Replacing Bearings and Gears For Allison M & MH Marine Transmissions
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April 8, 2025
Daily Checks (Pre-Operation)
Weekly Checks
Seasonal or Monthly Checks (Depending on Usage)
Oil and Filter Change Intervals For Allison M & MH Marine Transmissions
Recommended Oil Change Intervals
Filter Replacement Best Practices
Temperature and Pressure Monitoring For Allison M & MH Marine Transmissions
Operating Temperature Ranges
Tip:
Monitoring Options
Normal Hydraulic Pressure Ranges (MH Series)
Linkage and Cable Adjustment For Allison M & MH Marine Transmissions
When to Adjust Linkage or Cables
Mechanical Linkage (Rod System)
Cable Control Systems
Fluid Sampling For Wear Indicators For Allison M & MH Marine Transmissions
What to Look For
Laboratory Fluid Analysis
Final Thoughts On Scheduled Maintenance For Allison M & MH Marine Transmissions
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April 8, 2025
Priming Lubrication Systems For Allison M & MH Marine Transmissions
Manual Priming Methods
Priming Tips
Fluid Type and Fill Instructions For Allison M & MH Marine Transmissions
Approved Fluid Types
Fluid Capacity Guidelines
Fill Procedure
Manual Engagement and Rotation For Allison M & MH Marine Transmissions
Engaging Forward and Reverse
When Manual Rotation Is Difficult
Air Testing and Pressure Checks For Allison M & MH Marine Transmissions
Air Testing the Clutch Packs
Static Hydraulic Pressure Test
First-Run Operating Parameters For Allison M & MH Marine Transmissions
Step-by-Step First Start Procedure
Monitoring for Issues
Fluid Recheck and Top-Off
Short Sea Trial (Optional)
Final Considerations For Allison M & MH Marine Transmissions
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April 8, 2025
Pre-Installation Checklist for Allison M & MH Marine Transmissions
1. Confirm Model Compatibility
2. Inspect the Transmission
3. Gather Necessary Tools and Materials
4. Prepare the Workspace
Mounting Procedures for Allison M & MH Marine Transmissions
1. Lifting the Transmission
2. Engine Coupling
3. Mounting the Transmission
4. Foot Mount Adjustments (if applicable)
Alignment With Engine and Shaft for Allison M & MH Marine Transmissions
1. Initial Engine-to-Transmission Alignment
2. Propeller Shaft Alignment
3. Confirming Parallelism and Angular Alignment
4. Final Tightening
Fastener Torque Specifications for Allison M & MH Marine Transmissions
Bell Housing Bolts (Grade 8 Bolts)
Output Coupling Bolts
Transmission Mounting Bolts to Base
Oil Pan or Filt
er Housing Bolts
Sealing Surfaces and Gasket Preparation for Allison M & MH Marine Transmissions
1. Clean All Sealing Surfaces
2. Inspect for Damage
3. Selecting Gaskets and Sealants
4. Sealing Threaded Connections
5. Oil Seals and Shaft Seals
6. Leak Testing
Final Notes on Installation for Allison M & MH Marine Transmissions
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April 8, 2025
Physical Dimensions
Allison M Series Dimensions
Allison MH Series Dimensions
Weight
Allison M Series Weight Specifications
Allison MH Series Weight Specifications
Input/Output Shaft Specifications
Allison M Series Input/Output Shaft Details
Input Shaft:
Output Shaft:
Allison MH Series Input/Output Shaft Details
Input Shaft:
Output Shaft:
Rotation Direction and Gear Ratios
Rotation Direction
Gear Ratios
How to choose the right ratio:
Torque Handling and Horsepower Limits
Allison M Series Capabilities
Allison MH Series Capabilities
Final Notes on Specification Use
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April 8, 2025
Overview of Allison M & MH Series in Marine Applications
Legacy, Reliability, and Usage in Commercial and Recreational Vessels
A Legacy Built on Performance
Trusted in Commercial Marine Operations
Proven in Recreational and Private Yachts
Reliability and Longevity
Why Proper Servicing Matters: Performance, Longevity, and Safety
Performance Depends on Preventive Maintenance
Longevity Through Scheduled Maintenance
Safety Implications of Transmission Neglect
Cost Savings and Operational Continuity
Final Word on the Importance of This Guide
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International: 305-545-5588