CLAAS Id7680h / 7680h (501) – TR3 (A57-3) Transmission Module: PTO clutch skidding high

The system has detected excessive slipping (skidding) in the Power Take-Off (PTO) clutch mechanism. Because the slip exceeds safety parameters, the tractor's electronic control system automatically forces the PTO into the 'off' state to prevent further mechanical damage or catastrophic failure.

• Axion 810
• Axion 850
• Axion 930
• Arion 410
• Arion 420
• Arion 430
• Arion 510
• Arion 530
• Arion 550
• Arion 620
• Arion 630
• Arion 640

1. 1

   Check the rear PTO speed sensor (B142) for proper resistance, harness continuity, and erratic readings

2. 2

   Check the engine speed sensor (B228-1) located on the PTO clutch housing

3. 3

   Check the pressure of the low-pressure circuit applying the clutch to ensure it is not missing or low

4. 4

   Check the Power take-off clutch for mechanical wear, thinned clutch discs, or internal leakage

5. 5

   Check the 'Auto 5' module using CLAAS test tool 60 05 033 249

1. 1

   Read and Isolate Codes

   Note all error codes present. Clear them and operate the tractor to see if Id7680h returns, ensuring it is the root anomaly and not a cascaded error.

2. 2

   Inspect Wiring and Connectors

   Check the harnesses linking the TR3 (A57-3) module to the B142 and B228-1 sensors. Look for short-circuits, open circuits, or moisture damage.

3. 3

   Test Sensors

   Verify the adjustment and resistance of the rear PTO speed sensor (B142) and engine speed sensor (B228-1). Replace them if they are drifting or failing to provide feedback.

4. 4

   Hydraulic Pressure Test

   Measure the clutch engagement pressure on the low-pressure circuit. If pressure is low, inspect the PTO solenoid valve, regulator valve, and hydraulic filters for contamination or failure.

5. 5

   Module Testing/Replacement

   If the sensors and hydraulic pressure are within spec, use test unit 60 05 033 249 to check the 'Auto 5' module. Replace the module if it is internally shorted or failing to command the clutch properly.

6. 6

   Mechanical Clutch Inspection

   If all electronic and hydraulic commands are correct but the clutch still slips, the PTO clutch pack must be disassembled. Replace worn clutch discs, damaged hubs, or leaking internal seals.

7. 7

   Recalibration

   After replacing components, check the compatibility of program versions and perform any required calibration via the diagnostic terminal before returning the tractor to service.