Fendt 18.1.08 – Suspension / Auto-Guide: Y086 - Steering switch-off (Autoguide) solenoid valve

The system has detected a 'Signal fault' or that the 'Pilot pressure valve is faulty'. The Y086 solenoid valve is responsible for disconnecting the Y087 Auto-Guide control valve from the steering servo unit.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III, SCR, S4)
• Fendt 800 Vario (COM III, SCR, S4)
• Fendt 900 Vario (COM III, SCR, S4) (e.g., 919, 922, 924, 927, 930, 933, 936, 939)

1. 1

   Test the steering hydraulics for the Auto-Guide automatic track guidance using the A059 Auto-Guide terminal.

2. 2

   Inspect the wiring harness for damage, specifically checking the electrical separation point X1514 on the Y086 valve for corrosion, loose pins, or moisture.

3. 3

   Measure the power supply and ground connections to the Auto-Guide components using the Fendt 8-pin adapter cable (Part No. X899.980.288.207).

4. 4

   Verify that the pilot pressure to the valve is within specification to rule out a mechanical pilot pressure failure.

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, and turn off the engine. Relieve all hydraulic pressure from the steering and Auto-Guide circuits.

2. 2

   Access the Valve

   Remove the right rear wheel to gain access to the transmission side panel.

3. 3

   Remove the Panel

   Take off the right-side protective panel to expose the Auto-Guide steering valve block (Y087) and the steering disconnect solenoid valve (Y086).

4. 4

   Disconnect Electricals

   Unplug the electrical connector at separation point X1514 on the Y086 valve.

5. 5

   Remove the Valve

   Unbolt the Y086 solenoid valve from the hydraulic block. Have a catch pan ready to collect any residual hydraulic fluid.

6. 6

   Install the New Valve

   Lubricate the new O-rings/seals with clean hydraulic fluid. Install the new Y086 solenoid valve and torque the mounting bolts to OEM specifications.

7. 7

   Reassembly

   Reconnect the X1514 electrical connector. Reinstall the right-side panel and the right rear wheel.

8. 8

   Calibration/Testing

   Clear the 18.1.08 fault code from the system memory. Start the tractor, check for hydraulic leaks, and test the Auto-Guide system to ensure the steering wheel correctly disconnects during autonomous operation.