Fendt 8.3.39 – REAR EPC: Rear power lift 'Rapid lowering / Hitch lift' switch — Signal fault

The electronic control unit is receiving an implausible, missing, or out-of-range electrical signal from the switch responsible for the rapid lowering and hitch lift functions of the rear three-point linkage.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt Favorit 900 / 900 Vario series
• Fendt Farmer 400 / 400 Vario series
• Fendt Favorit 700 / 700 Vario series
• Fendt 800 Vario series

1. 1

   Use the FENDIAS diagnostic tool or the tractor's Variotronic Ti terminal to confirm the active 8.3.39 fault code

2. 2

   Locate the 'Rapid lowering / hitch' switch, designated as component S071 in Fendt wiring diagrams

3. 3

   Inspect switch S071 for physical wear, sticking contacts, or moisture ingress

4. 4

   Consult the 'Electrohydraulic power lift control' circuit diagram and test the continuity of the wiring harness between switch S071 and the REAR EPC module

5. 5

   Look for corroded pins or loose connectors at the separating point

1. 1

   Power Down

   Turn off the tractor ignition and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Switch

   Unscrew the retaining screws on the side console/armrest where the power lift controls are located and swivel the console downwards to access the underside.

3. 3

   Disconnect Wiring

   Locate the rapid lowering / hitch lift switch (S071). Carefully detach the electrical separating point (connector) from the bottom of the toggle switch.

4. 4

   Remove the Switch

   Unclip or unscrew the faulty switch from its mounting insert and pull it out of the console.

5. 5

   Install New Part

   Insert the replacement switch into the console slot until it clicks or is seated securely into place.

6. 6

   Reconnect

   Reattach the electrical connector to the new switch. Apply a small amount of dielectric grease to the contacts to prevent future corrosion.

7. 7

   Reassembly & Testing

   Swivel the console back into position and secure it with the screws. Reconnect the battery, turn on the ignition, clear the stored fault codes via the terminal, and test the rapid lowering/hitch lift functionality.