April 8, 2025
Overview of the Hydraulic Control System
Valve Body Components and Layout
Selector Valve Assembly:
Internal Passages:
Pressure Regulation Port:
Auxiliary Check Valves and Dump Valves:
Pressure Testing Procedures
Required Tools:
Test Setup:
Interpreting Results:
Solenoid Function and Replacement
Function of Solenoids:
Symptoms of Faulty Solenoids:
Replacement Procedure:
Internal Passage Cleaning
When to Clean Passages:
Cleaning Steps:
Important Tips:
Testing With Hydraulic Gauges
Recommended Gauges:
What to Monitor:
Testing Intervals:
Data Logging:
System Upgrades and Preventative Improvements
Available Enhancements:
Best Practices:
Common Hydraulic Failures and Troubleshooting
Issue: Delayed engagement in forward or reverse
Issue: Overheating
Issue: Fluctuating oil pressure
Issue: No clutch engagement
Issue: Oil leaks
Conclusion
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April 8, 2025
Identifying Symptoms of Oil Pump Failure
Common Symptoms of Oil Pump Issues:
Accessing and Removing the Oil Pump
Step-by-Step Removal:
Rotor and Housing Wear Inspection
Key Inspection Points:
Visual Inspection Tips:
Replacing or Rebuilding Components
Rebuild Steps:
Replace with New Pump:
Reinstallation and Priming
Reinstallation Procedure:
Priming the Oil System:
Final Notes on Oil Pump Service
Parts Available From Diesel Pro Power
Benefits:
FAQ
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April 8, 2025
Accessing the Clutch Pack
Wear Patterns and Friction Plate Scoring
Spring, Disc, and Piston Checks
Return Springs
Discs
Pistons
Clearance Measurements
Reassembly with Proper Preload
Key Reassembly Points:
Post-Installation Checks
Summary of Tools Required
Final Thoughts
For More Information
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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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