Fendt A.1.28 – ECU (Enhanced Control): Spool valve fault, valve 2

The main piston (valve actuator) cannot return to its neutral position and remains set, typically caused by oil contamination. This can lead to undefined and uncontrolled 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 / 400 Vario (COM III) 409
• Farmer 400 / 400 Vario (COM III) 410
• Farmer 400 / 400 Vario (COM III) 411
• Farmer 400 / 400 Vario (COM III) 412
• 300 Vario (COM III)
• Favorit 700 / 700 Vario (COM III) 711
• Favorit 700 / 700 Vario (COM III) 712
• Favorit 700 / 700 Vario (COM III) 714
• Favorit 700 / 700 Vario (COM III) 716
• 800 Vario (COM III) 815
• 800 Vario (COM III) 817
• 800 Vario (COM III) 818
• Favorit 900 / 900 Vario (COM III) 916
• Favorit 900 / 900 Vario (COM III) 920
• Favorit 900 / 900 Vario (COM III) 924
• Favorit 900 / 900 Vario (COM III) 926
• Favorit 900 / 900 Vario (COM III) 930

1. 1

   Verify the physical movement of the valve slider via manual actuation (slider must go into the middle position by itself without play)

2. 2

   Check the hydraulic oil for heavy contamination, debris, or degradation

3. 3

   Verify the wiring harness at connector X327 (pins 23, 24, or 26) for the Y016 Valve 2

1. 1

   Isolate the Valve

   Locate auxiliary control valve 2 (Y016), which is often designated by the color blue on the hydraulic block.

2. 2

   Clean or Replace the Spool Valve

   Remove the valve, thoroughly clean it, and inspect for scoring. If the piston or bore is scored, replace the entire spool valve assembly.

3. 3

   Flush and Replace Hydraulic Fluid

   Drain and replace the hydraulic oil and filters using Fendt Super Hyd or Fendt Extra Hyd 68 to prevent immediate recurrence.

4. 4

   EOL Reprogramming

   If a new auxiliary control valve is installed, use FENDIAS or an AGCO CANUSB diagnostic scanner to register the new valve on the CAN bus for its specific position (Position 2).