Fendt 08.1.F8 – A050 ECU (Basic Control Unit): Y077 [HKH] - EHR cut-off valve, rear (Rear Electronic Power Control / Electronic Hitch Control valve)

The valve actuator does not return to its neutral position. The most frequent cause is that the valve actuator mechanically jams (either the pilot control or the main actuator) due to contamination or debris in the hydraulics area. The valve remains deflected when the engine is on. The valve locks, and the pilot pressure is turned OFF by the system to prevent unintended movement.

• 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) / Farmer 400
• Fendt 700 Vario (COM III) / Favorit 700
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III) / Favorit 900
• 916
• 919
• 920
• 922
• 924
• 926
• 927
• 930
• 933
• 936

1. 1

   Check hydraulic fluid quality for dirt, metal shavings, or degraded fluid

2. 2

   Test valve actuation using the tractor's terminal or FENDIAS software to manually command the rear hitch and listen/feel for the Y077 valve

3. 3

   Inspect the Y077 valve block externally for any signs of mechanical binding or damage

4. 4

   Verify if the pilot pressure drops to zero when the fault is active

1. 1

   Depressurize the System

   Lower the rear hitch completely to the ground to remove the load. Turn off the engine and cycle the hydraulic controls to relieve any residual pilot pressure.

2. 2

   Locate the Y077 Valve

   Locate the rear EHR cut-off valve block (usually situated at the rear hydraulic distribution manifold).

3. 3

   Remove the Valve

   Disconnect the electrical harness connector to the Y077 solenoid. Carefully unbolt and remove the cut-off valve actuator from the valve block.

4. 4

   Inspect and Clean

   Inspect the spool and the bore for scoring, metal flakes, or debris. If the jam was caused by minor debris, thoroughly clean the valve actuator and the pilot control using hydraulic parts cleaner.

5. 5

   Evaluate for Replacement

   If the valve spool is scored, physically jammed, or fails to move freely after cleaning, the valve must be replaced.

6. 6

   Address Contamination

   If significant contamination was found in the valve, you must change the hydraulic oil filters and flush the hydraulic fluid to prevent the replacement valve from suffering the same fate.

7. 7

   Reinstall and Calibrate

   Install the cleaned or new Y077 valve. Reconnect the electrical harness. Top up hydraulic fluid if any was lost.

8. 8

   Clear Codes

   Turn the ignition on, access the fault memory in the terminal, and clear the 08.1.F8 code. Test the rear power lift for proper operation.