Endurant HD
TRSM0950 EN-US
|
February 2025 - A

MTM Rail B, C and D Cover Cap Screw

Special Instructions

  • Perform this entire procedure only:
    • If guided here by MTM Rail B, C and D Cylinder Inspection Procedure.
    • If guided here by TAIB0994 - MTM was removed for another transmission related issue and MTM Serial Number is less that 12S22342093445.
  • Reference the relevant warranty information provided in service bulletin TAIB-0994.

Special Tools

  • T30 Torx Bit
  • Torque Wrench - Nm (in lbs.)
  • Parts Cleaner (Loctite SF 7063 or equivalent)
  • Thread Lock (Loctite® 262™ Threadlocker Red or equivalent)
    Caution
    Only use items outlined above. Failure to follow these instructions could result in MTM damage.

Component Identification

MTM, Fore view

_Graphics/_LineArt/TRSM0950_MTMInspection_ID_Fore_2.png

MTM, Aft view

_Graphics/_LineArt/TRSM0950_MTMInspection_ID_Aft.png

1. MTM Rail B

2. MTM Rail D

3. MTM Rail C

_Graphics/_LineArt/MTM_SerialTagLocation.png

1. Part Number 2. Serial Number

Procedure - Rail B

  1. Place MTM on a clean surface.

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_1.png

  2. Remove 2 Rail B Shift Yoke Cylinder Cover T30 cap screws (1, 2 - M6x65).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_2.png

  3. Remove 1 Countershaft Speed Sensor T30 cap screw (5 - M6x65).

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_3.png

  4. Rotate Countershaft Speed Sensor clockwise 90 degrees.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_4.png

  5. Remove Countershaft Speed Sensor from housing.

    _Graphics/_Raster/CountershaftSpdSnsr_Removal.png

  6. Clean Rail B Shift Yoke Cylinder Cover threaded holes with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  7. Clean Countershaft Speed Sensor threaded hole with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  8. Install Countershaft Speed Sensor.

    _Graphics/_Raster/CountershaftSpdSnsr_Install.png

  9. Install Countershaft Speed Sensor harness.

    _Graphics/_Raster/CountershaftSpdSnsr_Harness_Install.png

  10. Clean 2 Rail B Shift Yoke Cylinder Cover T30 cap screws (M6x25) with parts cleaner.

  11. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  12. Install 2 Rail B Shift Yoke Cylinder Cover T30 cap screws (1, 2 - M6x25).

  13. Torque cap screws (1, 2) to 9.5-10.5 Nm (84-92 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_2.png

  14. Clean 1 Countershaft Speed Sensor T30 cap screws (M625) with parts cleaner.

  15. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  16. Install 1 (5) Countershaft Speed Sensor T30 cap screws (M6x25).

  17. Torque to 9.5-10.5 Nm (84-92 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_3.png

  18. Remove 2 Rail B Shift Yoke Cylinder Cover T30 cap screws (3, 4 - M6x65).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_18.png

  19. Clean Rail B Shift Yoke Cylinder Cover threaded holes with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  20. Clean 2 Rail B Shift Yoke Sylinder Cover T30 cap screws (M6x25) with parts cleaner.

  21. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  22. Install 2 Rail B Shift Yoke Cylinder Cover T30 cap screws (3, 4 - M6x25).

  23. Torque cap screws (3, 4) to 11-12 Nm (97-106 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_18.png
    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_23.png

  24. Remove 4 Rail B Cylinder Cover T30 cap screws (M6x65).

    Note: Remove, clean, apply thread lock and reinstall one cap screw at a time.

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailB_24.png

  25. Clean Rail B Cylinder Cover threaded holes with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  26. Clean 4 Rail B Cylinder Cover T30 cap screws (M6x25) with parts cleaner.

  27. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  28. Install 4 Rail B Cylinder Cover T30 cap screws (M6x25).

  29. Torque to 11-12 Nm (97-106 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailB_24.png

Procedure - Rail C

  1. Remove 2 Rail C Shift Yoke Cylinder Cover T30 cap screws (M6x25)

    Note: Remove, clean, apply thread lock and reinstall one cap screw at a time.

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailC_1.png
    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_23.png

  2. Clean Rail C Cylinder Cover threaded holes with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  3. Clean 2 Rail C Shift Yoke Cylinder Cover T30 cap screws (M6x25) with parts cleaner.

  4. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  5. Install 2 Rail C Shift Yoke Cylinder Cover T30 cap screws.

  6. Torque to 11-12 Nm (97-106 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailC_1.png
    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_1.png

  7. Remove 3 Rail C Cylinder Cover T30 cap screws (M6x65).

    Note: Remove, clean, apply thread lock and reinstall one cap screw at a time.

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailC_7.png

  8. Clean Rail C Cylinder Cover threaded holes with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  9. Clean 3 Rail C Cylinder Cover T30 cap screws (M6x25) with parts cleaner.

  10. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  11. Install 3 Rail C Cylinder Cover T30 cap screws.

  12. Torque to 11-12 Nm (97-106 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailC_7.png

Procedure - Rail D

  1. Move Shift Rails C and D in the MTM to neutral. Rails C and D are in neutral when the shift inter-lock is aligned with the notches of the rail yoke assemblies.

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_23.png
    _Graphics/_Raster/ShiftRailC&D_Neutral.png

  2. Remove 3 Rail D Shift Yoke Cylinder Cover T30 cap screws (1 - M6x65, 2, 3 - M6x25).

    Note: Remove, clean, apply thread lock and reinstall one cap screw at a time.

    _Graphics/_Raster/TRSM0950_MTM Inspect_Rail D_Rotate Yoke 1.png
    _Graphics/_Raster/TRSM0950_MTM Inspect_Rail D_Rotate Yoke 2.png

  3. Clean Rail D Shift Yoke Cylinder Cover threaded holes with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  4. Clean 3 Rail D Shift Yoke Cylinder Cover T30 cap screws (1 - M6x65, 2, 3 - M6x25) with parts cleaner.

  5. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  6. Install 3 Rail D Shift Yoke Cylinder Cover T30 cap screws (1 - M6x65, 2, 3 - M6x25).

  7. Torque to 11-12 Nm (97-106 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Inspect_Rail D_Rotate Yoke 1.png
    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_1.png

  8. Remove 3 Rail D Cylinder Cover T30 cap screws (M6x65).

    Note: Remove, clean, apply thread lock and reinstall one cap screw at a time.

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailD_8.png

  9. Clean Rail D Cylinder Cover threaded holes with parts cleaner.

    Notice
    Ensure threaded holes are free of contamination and debris. Failure to clean threaded holes results in a damaged housing when cap screws are installed.

  10. Clean 3 Rail D Cylinder Cover T30 cap screws (M6x25) with parts cleaner.

  11. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  12. Install 3 Rail D Cylinder Cover T30 cap screws.

  13. Torque to 11-12 Nm (97-106 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cover Cap Screw_RailD_8.png

  14. Determine next step.

    • If guided here by MTM Rail B, C and D Cylinder Inspection Procedure due to Fault Code 617, 740, 760, 775:
      • If Fault Code 617, go to Procedure A.
      • If Fault Code 740, go to Procedure B.
      • If Fault Code 760, go to Procedure C.
      • If Fault Code 775, go to Procedure D.
    • If guided here by MTM Rail B, C and D Cylinder Inspection Procedure and no fault codes were originally set, process complete.
    • If guided here by TAIB0994 - MTM was removed for another transmission related issue, process complete.

Procedure A

STEP A

Purpose: Verify mechanical condition of the Secondary Driven Gear

  1. Inspect the Secondary Driven Gear for excessive for and aft movement.

    • If excessive gear movement is evident, inspect the Main Shaft Assembly and Secondary Driven Gear and repair. Go to Step V.
    • If no excessive gear movement is evident, go to Procedure A, Step B.
    _Graphics/_LineArt/TRTS0950_FC617_SecondaryDrivenGear.png

Procedure A

STEP B

Purpose: Verify mechanical condition of the Rail C Sliding Clutch and clutching teeth.

  1. Inspect the Rail C Sliding Clutch yoke for wear.

    _Graphics/_LineArt/TRTS0950_FC295_CSlidingClutch.png

  2. Shift the Rail C Sliding Clutch to the neutral position (if necessary).

  3. Shift the Rail C Sliding Clutch into the Primary Drive Gear engagement position (fore).

  4. Inspect the Rail C Sliding Clutch clutching teeth for wear.

  5. Return the Rail C Sliding Clutch to neutral.

  6. Shift the Rail C Sliding Clutch into the Secondary Driven Gear engagement position (aft).

  7. Inspect the Rail C Sliding Clutch clutching teeth for wear.

  8. Return the Rail C Sliding Clutch to neutral.

    • If the Rail C Sliding Clutch shifts into all three positions and no clutching teeth wear is present, contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information
    • If the Rail C Sliding Clutch does not shift into all three positions or clutching teeth wear is present, reference Primary Drive Gear Replacement procedure for replacing the Primary Drive Gear and Rail C Sliding Clutch, and Secondary Driven Gear. Go to Step V.

Procedure B

STEP A

Purpose: Verify mechanical condition of the Primary and Secondary Drive Gears.

  1. Inspect the Secondary Drive Gear for excessive for and aft movement.

    _Graphics/_LineArt/TRTS0950_FC275_DriveGears.png

  2. Inspect the Primary Drive Gear for excessive fore and aft movement.

    • If excessive gear movement is evident, inspect for cause of excessive gear movement and repair. Go to Step V.
    • If no excessive gear movement is evident, go to Procedure B, Step B.

Procedure B

STEP B

Purpose: Verify mechanical condition of the Rail B Synchronizer and clutching teeth.

  1. Inspect the Rail B Synchronizer Sliding Sleeve yoke slot for wear.

    _Graphics/_LineArt/TRTS0950_FC596_RailBSynchro.png

  2. Install the Rail B Synchronizer Engagement Tool (RR1088TR).

    Note: Reference Appendix, Manually Actuate Rail B Procedure.

  3. Shift Rail B Synchronizer Sliding Sleeve into neutral (if necessary).

  4. Shift the Rail B Synchronizer Sliding Sleeve into the Secondary Drive Gear engagement position (fore).

  5. Inspect the Primary Drive Gear and synchronizer ring clutching teeth for wear.

  6. Return the Rail B Synchronizer Sliding Sleeve to neutral.

  7. Shift the Rail B Synchronizer Sliding Sleeve into the Primary Drive Gear engagement position (aft).

  8. Inspect the Secondary Drive Gear and synchronizer ring clutching teeth for wear.

  9. Return the Rail B Synchronizer Sliding Sleeve to neutral.

    • If the Rail B Synchronizer Sliding Sleeve shifts into all three positions and no clutching teeth wear is present, contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information.
    • If the Rail B Synchronizer Sliding Sleeve does not shift into all three positions or clutching teeth wear is present, reference the Primary Drive Gear Replacement procedure for replacement of the Primary Drive Gear. Replace the Rail B Synchronizer Assembly and the Secondary Drive Gear. Go to Step V.

Procedure C

STEP A

Purpose: Verify mechanical condition of the Primary Drive Gear and Secondary Driven Gear.

  1. Inspect the Primary Drive Gear for excessive fore and aft movement.

    _Graphics/_LineArt/TRTS0950_FC760_Gears.png

  2. Inspect the Secondary Driven Gear for excessive for and aft movement.

    • If excessive gear movement is evident, inspect for cause of excessive gear movement and repair. Go to Step V.
    • If no excessive gear movement is evident, go to Procedure C, Step B.

Procedure C

STEP B

Purpose: Verify mechanical condition of the Rail C Sliding Clutch and clutching teeth.

  1. Inspect the Rail C Sliding Clutch yoke slot for wear.

    _Graphics/_LineArt/TRTS0950_FC295_CSlidingClutch.png

  2. Shift the Rail C Sliding Clutch to the neutral position (if necessary).

  3. Shift the Rail C Sliding Clutch into the Primary Drive Gear engagement position (fore).

  4. Inspect the Rail C Sliding Clutch clutching teeth for wear.

  5. Return the Rail C Sliding Clutch to neutral.

  6. Shift the Rail C Sliding Clutch into the Secondary Driven Gear engagement position (aft).

  7. Inspect the Rail C Sliding Clutch clutching teeth for wear.

  8. Return the Rail C Sliding Clutch to neutral.

    • If the Rail C Sliding Clutch shifts into all three positions and no clutching teeth wear is present, contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information.
    • If the Rail C Sliding Clutch does not shift into all three positions or clutching teeth wear is present, refer to the Primary Drive Gear Replacement procedure for replacing the Primary Drive Gear and Rail C Sliding Clutch, and Secondary Driven Gear. Go to Step V.

Procedure D

STEP A

Purpose: Verify mechanical condition of the Primary Driven Gear and Reverse Gear

  1. Inspect the Primary Driven Gear for excessive fore and aft movement.

    _Graphics/_LineArt/TRTS0950_FC315_Gears.png

  2. Inspect the Reverse Gear for excessive fore and aft movement.

    • If excessive gear movement is evident, inspect for cause of excessive gear movement and repair. Go to Step V.
    • If no excessive gear movement is evident, go to Procedure D, Step B.

Procedure D

STEP B

Purpose: Verify mechanical condition of the Rail D Sliding Clutch and clutching teeth.

  1. Inspect the Rail D Sliding Clutch yoke slot for wear.

    _Graphics/_LineArt/TRTS0950_FC315_DSlidingClutch.png

  2. Shift the Rail D Sliding Clutch to the neutral position (if necessary).

  3. Shift the Rail D Sliding Clutch into the Primary Driven Gear engagement position (fore).

  4. Inspect the Rail D Sliding Clutch clutching teeth for wear.

  5. Return the Rail D Sliding Clutch to neutral.

  6. Shift the Rail D Sliding Clutch into the Reverse Gear engagement position (aft).

  7. Inspect the Rail D Sliding Clutch clutching teeth for wear.

  8. Return the Rail D Sliding Clutch to neutral.

    • If the Rail D Sliding Clutch shifts into all three positions and no clutching teeth wear is present, contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information.
    • If the Rail D Sliding Clutch does not shift into all three positions or clutching teeth wear is present, replace the Rail D Sliding Clutch, Primary Driven Gear and Reverse Gear. Go to Step V.

STEP V

  1. Key off.

  2. Reconnect all connectors and verify that all components are properly installed.

  3. Key on with engine off.

  4. Connect ServiceRanger.

  5. Go to “Fault Codes”.

  6. Select “Clear All Faults”.

  7. Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.

  8. Check for fault codes using ServiceRanger.

    • If no fault codes sets and the vehicle operates properly, test complete.
    • If Fault Code 617, 740, 760, 775 sets Active during operation, contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to “Contact Information” on page 4.
    • If a fault code other than 617, 740, 760, 775 sets Active, go to Endurant HD Troubleshooting Guide and troubleshoot per the Fault Code Isolation Procedure Index.

Warranty Information

  1. Reference the relevant warranty information provided in service bulletin TAIB-0994.