Case IH 2746 (517679.12) - DEC – Transmission Control Unit / CVT Module: Vehicles moves once power zero is detected

The tractor exhibits unexpected movement or continues to move when the system commands zero power (neutral/standstill). This is a known issue primarily caused by metallic contamination in the transmission fluid interfering with the PWM (Pulse Width Modulation) valves, or a physical failure of the transmission filter manifold/head where it joins the filter cartridge.

• MAXXUM T4E
• VESTRUM CVX
• Case IH Vestrum CVXDrive

1. 1

   Visually and physically inspect the transmission filters and the area around the transmission PWM valves for metallic contamination.

2. 2

   Perform a Sequential Test using the Electronic Service Tool (EST) by pulling a CAN LOG on CAN line 3 to monitor the transmission's behavior. Do not rely on the Volumetric EST test, as it cannot detect faults caused by contamination.

1. 1

   Inspect the Filter Housing

   Check the transmission filter head/manifold for cracks or breaks at the junction where the filter cartridge attaches. Replace the housing if damaged.

2. 2

   Check for Debris

   Remove the transmission filter and inspect it and the surrounding PWM valves for metallic shavings or debris.

3. 3

   Flush and Replace Fluid

   If any contamination is present, a complete transmission oil replacement is mandatory. Do not attempt to reuse the fluid.

4. 4

   Replace Filters

   Install a new transmission/hydraulic filter.

5. 5

   Clear Codes & Test

   Clear the 2746 fault code via the EST and test drive the tractor to ensure it remains stationary when zero power is commanded.