John Deere HCU521001.07 – HCU: Rear Hitch Raise Valve Fault

The system has detected an issue with the rear hitch's raise valve circuit, indicating that the valve is not calibrated or there is a calibration fault with the rear hitch raise solenoid/pressure valve. When this fault is active, the hitch may still be operable in a manual mode.

• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115M
• 5115ML
• 5225
• 5325
• 5425
• 5525
• 5625
• 5425HC
• 5425N
• 5625HC
• 5725
• 5725N
• 5725HC
• 5603
• 6110R
• 6120R
• 6135R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230R
• 6250R
• 7200
• 7410
• 7610
• 7720
• 7810
• 7830
• 7930
• 5103
• 5203
• 5303
• 5403
• 5105
• 5205

1. 1

   Check hydraulic oil level, as low hydraulic oil can trigger various hydraulic system faults

2. 2

   Check fuse F30, which is often related to the HCU valve supply voltage

3. 3

   Inspect the electrical system, including a visual inspection of the batteries and alternator for damage or debris, to rule out general voltage-related HCU codes

4. 4

   Check for related fault codes (521001.11, 521002.11, and 521002.07); if present, there is a higher suspicion of a failed hitch position sensor rather than just a calibration issue

1. 1

   Perform hitch calibration

   Have a John Deere dealer perform a hitch calibration procedure. This is the primary recommended step to resolve the fault.

2. 2

   Replace rear hitch raise valve

   If the calibration fails or the code returns, the rear hitch raise valve (which may include the solenoid) is likely faulty and needs to be replaced.

3. 3

   Recalibrate hitch system

   After replacing the valve, perform a new calibration procedure so the system recognizes the new component and operates correctly.