TAIB-0994 (TRIB0900)

Endurant XD, Endurant HD

TRIB0900 EN-US

June 2025 - A

TAIB-0994

Mechatronic Transmission Module (MTM) Loose Rail Cover Cap Screw

Date: April 2, 2021

Updated: May 12, 2025

Issue Description:

Customers may experience a transmission shift issue and transmission service lamp on due to MTM rail cylinder cap screws becoming loose, causing a cylinder to leak air and set Rail B, C and/or D related fault codes.

Notice

If the clutch does not release properly, Fault Code 570 (Inertia Brake Solenoid) and/or 706 (Clutch Position Out of Range) may appear along with MTM rail operation and/or solenoid fault codes. Should Fault Code 570 and/or 706 be present, whether Active or Inactive, diagnose these codes first by consulting the Endurant Troubleshooting Guide TRTS0950. Resolving clutch release related fault codes might address rail operation and solenoid fault codes as well.

If neither Fault Code 570 nor 706 is set, but you observe any of the other fault codes listed below, please proceed with the instructions outlined in the service bulletin.

Fault Code	SPN	Description	FMI
740	6145	Rail B Operation	0, 1
760	6146	Rail C Operation	0, 1, 2, 18
617	5910	Rail C Aft Solenoid	14*
775	6147	Rail D Operation	0, 1

Notice

*If Fault Code 617 FMI 14 is set, go to TRTS0950 Endurant HD troubleshooting guide Fault Code 617 FMI 14 fault code isolation procedure prior to performing this service bulletin.

Affected Models/Population:

MTM part label with Eaton only
MTM serial number less than 12S22342145012 (12S = 12-speed)
Endurant HD (12-speed)
- MTM Part number A-10000715
PACCAR TX-12 (12-speed)
- MTM Part Number A-10002594

MTM Part Label:

MTM Part Label Location and Type - Part Number (1), Serial Number (2):

Caution

Endurant XD (18-speed) transmission models are not affected by this issue and this document does not apply - Endurant XD MTM serial number example: 18S24013141749 (18S = 18-speed). Performing unnecessary repairs results in component contamination and/or damage.

Field Strategy:

Inspect MTM part label - Record label type and MTM Serial Number:
- If the label type is Eaton and Cummins, this service bulletin does not apply.
- If the label type is Eaton only and MTM serial number is less than 12S22342145012, go to Step 2.
- If the label type is Eaton only and MTM serial number is equal to or greater than 12S22342145012, this service bulletin does not apply.
Key on with engine off.
Connect ServiceRanger.
Create a Service Activity Report (SAR).
Select “Send to Eaton” - Internet connection required.
Compare fault codes in SAR with table below:
- If any Active or Inactive fault codes and FMIs outlined in table are indicated in the SAR, go to TRSM0950 Endurant HD Service Manual Appendix and perform MTM Rail B, C and D Cylinder Inspection Procedure.
  Notice
  Service Field Strategy has changed 04/10/2024 to use K-4637 or K-4637-PAC to replace O-rings if any rail cylinder cover O-ring has moved out of its groove and is protruding between cylinder and housing cover.
- If other Active or Inactive transmission fault codes and FMIs are indicated in the SAR, go to TRTS0950 Endurant HD Troubleshooting Guide, Fault Code Isolation Procedure Index.

Fault Code	SPN	Description	FMI
740	6145	Rail B Operation	0, 1
760	6146	Rail C Operation	0, 1, 2, 18
617	5910	Rail C Aft Solenoid	14*
775	6147	Rail D Operation	0, 1

Notice

*If Fault Code 617 FMI 14 is set, go to TRTS0950 Endurant HD troubleshooting guide Fault Code 617 FMI 14 isolation procedure prior to performing this service bulletin.

Warranty Information:

Warranty Parts

Parts Cleaner (Loctite SF 7063 or equivalent)
K-4637 or K-4637-PAC, includes:
- 71232, thread adhesive
- K-4636, MTM O-ring Kit

Notice

As of 08/01/2023, if an MTM is returned with visibly loose rail cylinder cap screws with no fault codes and serial number in Affected Models, claim is subject to denial.

Warranty Labor (ECWY3000)

Fault Codes in Issue Description:
- Diagnostics (Up to 1.0 hour)
- Transmission R&R (Up to 3.4 hours)
- MTM R&R - (Up to 1.2 hours)
- MTM Rail Cylinder Service Procedure (Up to 0.8 hour)
- Road Test (up to 0.3 hour)

General Claim Coding:

Fault codes outlined in Issue Description warranty claim:

• Line Item tab - Repair Line List

Primary Casual Part #: Code to failed MTM part number
Secondary Casual Part #: N/A
Complaint Code: Varies
Failure Mode Description: FASTENER LOOSE - RAIL B OR C CYLINDER (TFM-0516)
Responsibility Code:
- RTW COMMITMENT (601) for RTW claims
- Vendor Part (418) for all others
Part Return Instructions: Per OEM or RTW Instructions

• RMA Claim Coding:

Failure Mode Description: FASTENER LOOSE - RAIL B OR C CYLINDER (TFM-0516)
RMA PCP#: Code to failed MTM part number
RMA SCP#: N/A
SCP Failure Mode: N/A

Warranty Coverage:

Standard warranty per Model and Vocation as published in the Eaton Cummins Automated Transmission Technologies Warranty Manual ECWY3000.

Change Log

Date	Description
05/12/2025	Updated MTM part label image, Affect Models and Field Strategy sections.
03/03/2025	Aligned SRT’s to ECWY3000.
10/14/2024	Updated Issue Description, added NOTICE to troubleshoot FC570 and FC706, if present, prior to performing this service bulletin (DB).
04/10/2024	Service Field Strategy has changed 04/10/2024 to use O-ring kit K-4637 or K-4637-PAC when Active or Inactive fault codes in table are present.
03/04/2024	Updated Affected Models/Population: added MTM part numbers and CAUTION statement and MTM Part Label image.
09/25/2023	Updated Containment/Corrective Action, Field Strategy, Warranty Information: Parts, Labor and Claim Coding sections.
07/10/2023	Updated Issue Description, added FC 775 SPN 6147 FMI 0, 1

The material contained in this bulletin is product improvement information. Eaton Corporation is not committed to, or liable for, canvassing existing products.

FSUD: 4277