Fendt A.1.4B – Enhanced Control Unit (ECU A002): Spool valve fault, valve 4 – Floating position is not reached.

The valve automatically moves into the neutral position and locks to prevent uncontrolled hydraulic functions.

• 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
• Farmer 400 Vario
• Favorit 700 Vario
• Favorit 900 Vario
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series

1. 1

   Hydraulic Oil Temperature: Check if the hydraulic oil is too cold, which can cause sluggish spool movement.

2. 2

   Control Pressure: Verify that the hydraulic control pressure has not dropped below 22 bar.

3. 3

   Oil Contamination: Inspect the hydraulic system for oil contamination that could cause the main piston to mechanically bind.

4. 4

   Terminal Calibration Check: Check if the valve simply needs to be recalibrated to relearn its end stops.

1. 1

   Warm Up the System

   Bring the tractor's hydraulic oil up to normal operating temperature and retest the auxiliary valve to see if the floating position can now be reached.

2. 2

   Calibrate the Spool Valves

   Access the tractor's terminal to perform a calibration of the hydraulic auxiliary spool valves. Enter the calibration menu (often accessed via input code 1001 for the crossgate lever or codes 1003–1006 for linear modules 1–4) and follow the on-screen prompts to let the valve relearn its neutral, working, and floating positions.

3. 3

   Inspect and Clean

   If calibration fails, physically inspect the Y018 valve (Valve 4). Remove the valve and check for internal scoring or contamination. Clean the valve block and spool thoroughly.

4. 4

   Replace the Valve

   If the spool is permanently jammed, the internal position sensor is faulty, or the magnet output stage has failed, the Y018 valve must be replaced.

5. 5

   EOL Programming

   After installing a new valve, it must be calibrated and programmed for 'position 4' in the EOL (End of Line) program via the FENDIAS diagnostic software.