Fendt 6.1.1C – Enhanced Control Unit (ECU) / E-box: Y028 - Solenoid valve, rear PTO, stage III Actuation fault

The system detects that the solenoid valve responsible for engaging the 1000 RPM rear PTO speed is either stuck in the 'OFF' position, wrongly wired, or seized. As a result, the corresponding PTO speed cannot be engaged.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt Farmer 400 Vario
• Fendt Favorit 700 Vario
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)

1. 1

   Attempt to engage the PTO electrically by pressing the 'Engage PTO' key in the cab for more than 5 seconds to trigger emergency mode and see if the system bypasses the fault

2. 2

   Consult the PTO circuit diagram (Sheet 32) and inspect the wiring harness to the Y028 solenoid valve for shorts, breaks, or incorrect wiring

3. 3

   Check the power supply to the Hall-effect sensor B020 (rear PTO stub shaft sensor), as a signal fault here can correlate with engagement failures

4. 4

   Apply 12 VDC from an external power source directly to the Y028 solenoid valve to test physical actuation. If it does not actuate, the valve is seized or internally failed

1. 1

   Locate

   Locate the Y028 solenoid valve on the rear PTO valve block.

2. 2

   Remove

   Disconnect the electrical harness and remove the faulty solenoid valve.

3. 3

   Install

   Install the new solenoid valve.

4. 4

   Test

   Energize the newly installed Y028 solenoid valve with 12 VDC from an external source.

5. 5

   Adjust

   Set the control fork to an overrun of 0.2 mm (+0.1 mm tolerance).

6. 6

   Verify

   Verify that the PTO setting (1000 RPM) successfully engages.

7. 7

   Secure

   Coat the adjustment screw thread with a synthetic bonding agent (OEM part X903.050.084) to secure it.

8. 8

   Reconnect

   Reconnect the tractor's wiring harness and clear the fault codes via the terminal.