Case IH 2560 – Transmission Control Module: Uncommanded movement of synchroniser F1/F3 to neutral

This code indicates that the transmission control system detected the F1/F3 synchronizer physically moving out of its engaged gear position and slipping into neutral without receiving a command from the controller to do so.

• Optum
• Puma 150
• Puma 165
• Puma 180
• Puma 185
• Puma 195
• Puma 200
• Puma 210
• Puma 220
• Puma 225
• Puma 240
• Magnum 180
• Magnum 200
• Magnum 210
• Magnum 255
• Magnum 285
• Magnum 310
• Magnum 340
• Farmall 95C
• Farmall 100N

1. 1

   Monitor live data using the Electronic Service Tool (EST) or onboard 'H Menu' to check the F1/F3 synchronizer position sensor values (300-1200 for F1, 2050-2800 for Neutral, 3550-4700 for F3).

2. 2

   Inspect the electrical circuit, wiring harness, and connectors for the F1/F3 synchronizer potentiometer and shift solenoids for open circuits, shorts to ground, or shorts to a 5V/12V source.

3. 3

   Perform a hydraulic pressure test to verify transmission oil pressure is within specification and shift cylinders/solenoids are receiving proper flow.

4. 4

   Assess for mechanical driveline failures, such as a broken snap ring, worn synchronizer ring, or damaged shift fork, if sensor readings and hydraulic pressures are normal.

1. 1

   Access Diagnostics

   Turn the ignition key ON and enter the diagnostic menu (or connect the EST) to verify Code 2560 and check for related electrical codes (such as 2507/2508 for sensor voltage issues or 2511/2512 for solenoid faults).

2. 2

   Electrical Repair

   If the position sensor reading is erratic, replace the F1/F3 synchronizer potentiometer. If wiring is damaged, repair the harness leading to the transmission cover.

3. 3

   Transmission Disassembly

   If diagnostics point to a mechanical failure holding the gear, the tractor must be split or the transmission gear cover removed to access the CVT/FPS internal components.

4. 4

   Component Replacement

   Inspect the F1/F3 shaft, shift cylinder, shifter fork, and synchronizer assembly. Replace any worn synchronizer blocking rings, damaged shift forks, or broken retaining snap rings.

5. 5

   Reassembly

   Reassemble the transmission components and refill the system with approved hydraulic/transmission fluid (e.g., Case IH Hy-Tran).

6. 6

   Calibration and Code Clearing

   Navigate to the 'H8' or 'HC' menu in the instrument cluster to clear all stored fault codes. Perform a full transmission calibration to allow the controller to relearn the F1/F3 synchronizer engagement and neutral positions.