LCA Service / Reset Procedure - Endurant HD and XD, PACCAR TX-12 and TX-18

Date: February 4, 2025

Updated: December 09, 2025

Issue Description:

Customers may report difficulties in locking the Linear Clutch Actuator (LCA) into the service/reset position. This issue may be caused by the single locking ring and push rod retainer coming out of position, which in turn prevents the actuator from locking into the reset position.

Note: This issue does not impact the transmission during normal operation and is only observed during an LCA service event.

Additionally, the LCA may not have been fully locked into the reset position due to not being fully compressed during the LCA reset procedure. Picture below indicates a properly reset LCA, locking ring tabs fully locked into the push rod.

Affected Models/Population:

• High Pre-Load (HPL) type LCA (raised casting at 5 o’clock position) with a single locking ring retainer.

Field Strategy:

In cases where the LCA cannot be locked into the reset position:

1. Inspect the LCA locking ring retainer:

• If the LCA locking ring retainer is out of position, replace LCA.
• If the LCA locking ring retainer is in place, go to Step 2.

2. Re-perform the LCA reset procedure and ensure the LCA push rod is fully compressed during procedure.

Locked in Reset Position	Not Locked in Reset Position

3. Place LCA push rod on a clean, flat surface. Tightly grasp LCA housing with both hands and push down on push rod to lock LCA into the reset position. As much as 340 lbs. of force may be needed to reset the LCA into the service position. If LCA is returned, no damage is found, and it can be reset into the service position, claim will be denied.

4. Inspect LCA to determine next steps, reference images below:

• If LCA remains locked in the reset position, install LCA.
• If LCA does not remain locked in the reset position, replace LCA.

Locked in Reset Position	Not Locked in Reset Position

• Endurant HD - TRSM0950
• Endurant XD - TRSM0960

Normal LCA Push Rod Seat:

Warranty Information:

Warranty Parts:

• No parts if LCA locks into the reset position.
• Parts only required if:
  • If the LCA locking ring retainer is out of position.
  • If the LCA locking ring retainer is in position but cannot be locked in the reset position after re-performing the reset procedure.

Warranty Labor:

No additional labor.

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

FSUD: 4696