Clutch Release System Wear/Damage - Endurant and PACCAR Transmissions

Updated: March 3, 2025

Issue Description:

Over repair/under repair of the Clutch Release System (and/or clutch) due to a lack of troubleshooting wear measurement criteria. For customers experiencing an illuminated transmission service lamp and Fault Code 511 (SPN 5614) FMI 7, 10, refer to TAIB-0885.

Containment/Corrective Action:

Document Clutch Release System and/or Clutch Diaphragm Spring wear troubleshooting measurement criteria and Clutch Release System damage to look for per this TAIB.

Affected Models/Population:

• Endurant HD, XD Transmissions
• PACCAR TX12, TX18 Transmissions

Field Strategy:

If Fault Code 706 SPN 2983 FMI 17 or 18 is set Active or Inactive or you were sent here from TAIB-0885, perform the clutch release system inspection detailed in the Service Strategy section.

Service Strategy:

Reference Endurant HD Automated Transmission Service Manual TRSM0950 for all service procedures.

1. Inspect Input Shaft Pilot Bearing Wear Sleeve for excessive wear.

• If excessive wear is found, inspect the pilot bearing for wear and/or failure.
  • If pilot bearing wear and/or failure is found, replace pilot bearing per OEM guidelines.

    Note: Pilot bearing replacement is non-warrantable.

  • If Input Shaft Pilot Bearing Wear Sleeve wear and/or damage is found, replace Input Shaft Pilot Bearing Wear Sleeve.

    Note: Input Shaft Pilot Bearing Wear Sleeve wear and/or damage is non-warrantable.

  • Go to Step 2.
• If no excessive wear is found, go to Step 2.

2. Inspect Release Bearing

• If release bearing casting has come into contact with release yoke casting, replace the release bearing, release yoke and the release yoke pivot pin. Go to Step 7.
• If the release bearing inner sleeve is cracked or broken, replace the release bearing. Go to Step 6.
• If the inner wave spring is protruding from the face of the bearing, replace the release bearing. Go to Step 6.
• If the release bearing outer baffle has rotated fully outside of the original staked position, replace the release bearing assembly. Go to Step 6.

New	Partially Rotated (Reuse)	Rotated (Replace)

3. Inspect release bearing assembly for wear and/or “divots” on wear pads from rollers. Document the wear measurements in the warranty claim notes.

• If wear is found, measure wear with a caliper.
• If wear and/or “divot” measurement exceeds 0.5 mm in depth, replace the Release Bearing assembly. Go to Step 6.
• If wear and/or “divot” measurement is less than 0.5 mm, go to Step 4.

4. Measure Release Bearing assembly for wear.

• Place release bearing assembly on the workbench with the bearing side up.
  • With a pair of vernier calipers, measure from the top of the wear crown to the roller yoke contact area (Not in the release yoke roller divot that was just measured and not in the lowest point of the bearing surface).
  • Equal pressure will need to be applied to the other side of the bearing when making this reading.

Measuring an ISO Bearing

• ISO Bearing (P/N 125969, A-10004340) Minimum Specification is 51.80 mm.
• SAE Bearing (P/N 125968, A-10004341) Minimum Specification is 44.95 mm.
• If bearing is under specification, replace release bearing assembly. Go to Step 6.
• If bearing is within specification, go to Step 5.

5. Place release bearing assembly (bearing side down). With downward pressure rotate the release bearing assembly by hand. New or low hour bearings will have a higher rolling resistance (New seals and new grease).

Rotate with pressure	Rotate checking for seal drag

• If the release bearing is hard to turn (seized or partially seized) replace the release bearing. Go to Step 6.
• If the release bearing shows no signs of seal drag, replace the release bearing. Go to Step 6.
• If the release bearing does not rotate smoothly with downward pressure, replace the release bearing. Go to Step 6.

6. Inspect the release yoke, release yoke pivot pin, release yoke plastic sockets for damage.

• If the release yoke pivot pin is broken, replace the release yoke pivot pin, release yoke, and the release bearing. Go to Step 7.
• If release yoke casting has come into contact with release bearing casting, replace the release yoke, release yoke pivot pin, and the release bearing. Go to Step 7.
• New 125891 Release Yoke
• Inspect release yoke rollers (both sides) for lateral (Fore and Aft) movement and Up and Down Movement. If roller movement is found, replace the release yoke, release yoke pivot pin, and the release bearing. Go to Step 7.

Fore and Aft	Up and Down

• Release Yoke and Plastic Sockets (New)
• If Release Yoke Pivot Pin and/or Release Yoke and/or plastic sockets are damaged, replace Release Yoke Assembly and Release Yoke Pivot Pin. Go to Step 7.
• If no movement is found in both rollers, the release yoke casting has not come into contact with the release bearing casting, and the plastic sockets are not damaged, reuse the release yoke. Go to Step 7.

7. Inspect the Clutch Diaphragm Spring for wear. Reference Eaton CLIB0040.

8. If no observed Clutch Release System and/or Clutch Diaphragm Spring wear is within the acceptable limits found in this FSUD or Eaton Clutch FSUD, continue with troubleshooting as appropriate.

Note: It is highly recommended to implement the new High Preload LCA (HPL LCA), New reduced weight Release Yoke, and Release Yoke Pivot Pin at the time of clutch replacement. The introduction of the HPL LCA and the reduced weight release yoke will improve the clutch release system dynamics between the release yoke, release bearing, and diaphragm spring of the clutch cover (Customer Pay if not found to be warrantable).

Warranty Information:

Warranty Parts (if warrantable):

• (HD) K-4488CL Clutch Service Kit (PACCAR X15 / Paccar MX / Navistar X15 / Navistar A26)
• (HD) K-4494CL Clutch Service Kit (Volvo X15)
• (HD) K-4488CL / K-4488CL-PAC Clutch Service Kit (PACCAR X15 / Paccar MX / Navistar X15 / Navistar A26)
• (HD) K-4496CL Clutch Service Kit (Freightliner / Western Star - Detroit Diesel Engines)
• (HD) K-4512CL Clutch Service Kit (All OEMs with Cummins CNG Engines)
• (HD) K-4514CL / K-4514CL-PAC Clutch Service Kit (MX11 / MX13)
• (XD) K-4544CL Clutch Service Kit (Freightliner / Volvo / Western Star - Cummins Engines)
• (XD) K-4545CL Clutch Service Kit (PACCAR / Navistar - Cummins) or (Navistar A26)
• (XD) K-4557CL Clutch Service Kit (Freightliner / DTNA / Western Star / Volvo - Cummins Engines)
• (XD) K-4558CL Clutch Service Kit (PACCAR / Navistar - Cummins Engines)
• (XD) K-4559CL Clutch Service Kit (Freightliner - Cummins Engines)
• (XD) K-4560CL Clutch Service Kit (PACCAR / Navistar - Cummins) or (Navistar A26)
• (XD) K-4561CL / K-4561CL-PAC Clutch Service Kit (MX11 / MX13)
• (XD) K-4638CL / K-4638CL-PAC Clutch Service Kit (MX11 / MX13)
• K-4553 Release Yoke Assembly Kit
• 10001949 Release Yoke Pivot Pin
• A-10004341 (Previously 125968) Release Bearing (SAE)
• A-10004340 (Previously 125969) Release Bearing (ISO)

Warranty Labor (if found warrantable) (ECWY3000):

• Diagnostics (Up to 1 Hour)
• Transmission R&R (Up to 3.4 hours)
• Release Yoke R&R (Up to 0.1 Hour)
• Release Yoke Pivot Pin R&R (Up to 0.1 Hour)
• Release Bearing R&R (Up to 0.1 hour)
• Test Drive (Up to 0.3 Hour)

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

FSUD: 4226