Fendt A.1.DA – Tractor / General System (Spool Valves 1): S022 - Switch (external), lower front power lift

The system has detected that the external push-button switch used to lower the front linkage is faulty, which locks out the valve operation for the front power lift and disables the 'Kickout' function.

• 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
• Favorit 500 series
• Favorit 700 series
• Favorit 900 series
• 300 Vario series
• 400 Vario series
• 700 Vario series
• 800 Vario series
• 900 Vario series
• 1000 Vario S4 series (1038, 1042, 1046, 1050)
• 200 Vario S3 series (207, 208, 209, 210, 211)

1. 1

   Check the S022 external lower switch on the front of the tractor for dirt, mud, or debris that might be physically jamming the button.

2. 2

   Disconnect the switch and inspect the wiring harness for breaks, chafing, or a short-to-ground, as well as corrosion inside the connector.

3. 3

   Consult the tractor's wiring diagram (specifically 'Sheet 26' or 'Sheet 27' for Spool Valves) to trace the signal line back to the control module and verify voltage/continuity.

1. 1

   Preparation

   Turn off the tractor, lower any front implements safely to the ground (if possible), and disconnect the battery to protect the electronic control circuits.

2. 2

   Access the Switch

   Locate the S022 external lift/lower switch assembly mounted on the front linkage housing.

3. 3

   Disconnect

   Unplug the wiring harness connector from the back of the switch.

4. 4

   Clean and Prep

   Clean the harness connector thoroughly. Apply dielectric grease to the terminals to prevent future moisture ingress and corrosion.

5. 5

   Replace

   If the switch is internally shorted or mechanically broken, unbolt/unclip the old switch from its external mounting bracket and install the new OEM replacement switch.

6. 6

   Reassembly

   Reconnect the wiring harness securely.

7. 7

   Clear Codes & Test

   Reconnect the battery, turn on the tractor, and use the Vario terminal to clear the stored A.1.DA fault code. Test the external lower button to ensure the front power lift responds smoothly and the code does not return.