Case IH 2622 (6153.18) - DEC – DEC: Synchro 2/4 or 6/8 disengage error

The transmission's synchronizer for gears 2/4 or 6/8 is failing to disengage properly. The control module is receiving a valid signal from the synchronizer position sensor, but the value is below the expected normal operating threshold.

• MAXXUM T4E

1. 1

   Check the transmission oil temperature and pressure sensors to ensure the fluid is at operating parameters.

2. 2

   Run a transmission calibration procedure to see if the synchronizer can successfully relearn its engagement/disengagement positions.

3. 3

   Check the wiring harness and connectors for the synchronizer position transducers and shift solenoids for shorts or open circuits.