Endurant HD
TRSM0950 EN-US
|
January 2025 - B

MTM Rail B, C and D Cylinder

Special Instructions

  • Perform this entire procedure only if guided here by MTM Rail B, C and D Cylinder Inspection Procedure.
  • Reference the relevant warranty information provided in service bulletin TAIB-0994.

Special Tools

  • T30 Torx Bit
  • Torque Wrench - Nm (in lbs.)
  • PS-386 HD Synthetic Transmission Lubricant
  • Parts Cleaner (Loctite SF 7063 or equivalent)
  • Thread Lock (Loctite® 262™ Threadlocker Red or equivalent)
  • K-4637 MTM O-ring Repair Customer Repair Kit - 71232 Thread Adhesive - K-4636 (NSS) MTM O-ring Repair Kit, includes:
    • Rail B Shift Yoke Cylinder Cover O-ring, 10004839, Qty. 1 - 64mm (2.5 inches)
    • Rail C and D Shift Yoke Cylinder Cover O-ring, 10004840, Qty. 2 - 47mm (1.85 inches)

      Note: If K-4637 MTM O-ring Repair Kit is not available, replace with warranty-only part K-4355W.

      Caution
      Only use items outlined above. Failure to follow these instructions could result in MTM damage.

Component Identification

_Graphics/_LineArt/MTM_SerialTagLocation.png

1. Part Number

2. Serial Number

Disassemble Rail B

  1. Place MTM on a clean surface.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_1.png

  2. Remove 4 Rail B Shift Yoke Cylinder Cover T30 cap screws (1, 2, 3, 4 - M6x65).

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_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 sensor from housing.

    Note: Ensure sensor and harness are free from housing to avoid damage during shift yoke removal.

    _Graphics/_Raster/RailB_DA_Standalone_IMG5.png

  6. Firmly grasp and remove Rail B Shift Yoke assembly from cylinder.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_7.png

  7. Place Rail B Shift Yoke assembly on a clean surface.

Assemble Rail B

  1. Remove Rail B Shift Yoke cover O-ring from cover groove.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG1.png

  2. Slide O-ring over piston assembly.

    Note: Do not damage or remove piston O-ring.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG2.png

  3. Lubricate new Rail B Shift Yoke cover O-ring 64mm (2.5 inches) with PS-386 HD Synthetic Transmission Lubricant.

  4. Install new Rail B Shift Yoke cover O-ring, slide over piston assembly and into cover groove.

    Note: Ensure O-ring is fully seated in groove.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG4.png

  5. Inspect Rail B cylinder for contamination. Remove any contamination and excessive oil with a lint-free cloth.

    Note: Do not remove residual cylinder lubricant. If necessary, lightly lubricate cylinder with PS-386 HD Synthetic Transmission Lubricant.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG5.png

  6. 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.

  7. Carefully install Rail B Shift Yoke assembly into Rail B cylinder.

    Note: Ensure assembly is fully seated into cylinder.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Assemble Rail B_7.png

  8. Install Countershaft Speed Sensor.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG8.png

  9. Install Countershaft Speed Sensor harness.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG9.png

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

  11. Apply thread lock as indicated.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG11.png

  12. Install 4 Rail B Shift Yoke Cylinder Cover T30 cap screws (1, 2, 3, 4 - M6x25).

  13. Torque to 9.5-10.5 Nm (84-92 in lbs.) in a crisscross pattern.

  14. Re-torque bottom two cap screws to 11-12 Nm (97-106 in lbs.).

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_2.png

  15. Clean 1 Countershaft Speed Sensor T30 cap screw (M6x25) with parts cleaner.

  16. Apply thread lock as indicated.

    _Graphics/_Raster/RailB_DA_Standalone_A_IMG16.png

  17. Install 1 (5) Countershaft Speed Sensor T30 cap screw (M6x25).

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

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail B_3.png

Disassemble Rail C and D

  1. Place MTM on a clean surface.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_1.png

  2. 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/RailCandD_DA_Standalone_IMG3.png

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

    Note: Rotate Rail D Shift Yoke to access upper right cap screw.

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

  4. Firmly grasp and remove Rail D Shift Yoke assembly from cylinder.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_4.png

  5. Place Rail D Shift Yoke assembly on a clean surface.

  6. Remove Rail C and D Shift Inter-lock Pin.

    _Graphics/_Raster/RailCandD_DA_Standalone_IMG6.png_Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_6.png

  7. Remove 3 Rail C Shift Yoke Cylinder Cover T30 cap screws (4, 5, 6 M6x25).

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_7.png

  8. Firmly grasp and remove Rail C Shift Yoke assembly from cylinder.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_8.png

  9. Place Rail C Shift Yoke assembly on a clean surface.

    _Graphics/_Raster/RailCandD_DA_Standalone_IMG9.png

Assemble Rail C and D

  1. Remove Rail D Shift Yoke cover O-ring from cover groove.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG1.png

  2. Slide O-ring over piston assembly.

    Note: Do not damage or remove piston O-ring.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG2.png

  3. Lubricate new Rail D Shift Yoke cover O-ring 47mm (1.85 inches) with PS-386 HD Synthetic Transmission Lubricant.

  4. Install new Rail D Shift Yoke cover O-ring, slide over piston assembly and into cover groove.

    Note: Ensure O-ring is fully seated in groove.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG4.png

  5. Remove Rail C Shift Yoke cover O-ring from cover groove.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG5.png

  6. Slide O-ring over piston assembly.

    Note: Do not damage or remove piston O-ring.

  7. Lubricate new Rail C Shift Yoke cover O-ring 47mm (1.85 inches) with PS-386 HD Synthetic Transmission Lubricant.

  8. Install new Rail C Shift Yoke cover O-ring, slide over piston assembly and into cover groove.

    Note: Ensure O-ring is fully seated in groove.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG8.png

  9. Inspect Rail C and D cylinders for contamination. Remove any contamination and excessive oil with a lint-free cloth.

    Note: Do not remove residual cylinder lubricant. If necessary, lightly lubricate cylinder with PS-386 HD Synthetic Transmission Lubricant.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG9.png

  10. Clean Rail C and 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.

  11. Carefully install Rail C Shift Yoke assembly into Rail C cylinder.

    Note: Ensure assembly is fully seated into cylinder.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_11.png

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

  13. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG13.png

  14. Install 3 Rail C Shift Yoke Cylinder Cover T30 cap screws (4, 5, 6 - M6x25).

  15. Torque to 11-12 Nm (97-106 in lbs.) in a crisscross pattern.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_7.png

  16. Install Rail C and D Shift Inter-lock Pin. Apply transmission assembly lube to hold pin in place.

    Caution
    Ensure to install Rail C and D Shift Inter-lock Pin. Failure to install inter-lock pin could result in transmission component damage.

  17. Move Shift Rail C Shift Yoke to neutral and align Shift Inter-lock Pin to groove.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG17.png

  18. Carefully install Rail D Shift Yoke assembly into Rail D cylinder.

    Note: Ensure assembly is fully seated into cylinder.

    _Graphics/_Raster/TRSM0950_MTM Cylinder_Disassemble Rail D & C_18.png

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

  20. Apply thread lock as indicated.

    _Graphics/_Raster/RailCandD_DA_Standalone_A_IMG20.png

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

  22. Torque to 11-12 Nm (97-106 in lbs.) in a crisscross pattern.

    _Graphics/_Raster/TRSM0950_MTM Inspect_Rail D_Rotate Yoke 1.png

  23. 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.

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, process complete. Go to Step V.
    • 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, process complete. Go to Step V.
    • 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, process complete. Go to Step V.
    • 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, process complete. Go to Step V.
    • 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

Purpose: Verify Repair.

  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 set 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.
    • 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.