New Holland 4120 – EHR: Rear Remote No. 2 Spool Movement Too Low

The Electronic Hydraulic Remote (EHR) controller has commanded the No. 2 rear remote spool valve to move, but the internal position sensor reported that the spool did not travel the required distance. This lack of sufficient movement, sometimes described as 'Spool Deflection Too Short', may negatively affect the operation of the attached hydraulic function. The underlying condition preventing the spool from achieving its target position could be a mechanical blockage, a hydraulic pressure/flow issue, or an electrical failure.

• T6.120
• T6.140
• T6.150
• T6.155
• T6.160
• T6.165
• T6.175
• T6.180
• T7.170
• T7.185
• T7.200
• T7.210
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T6020
• T6030
• T6050
• T6070
• T6080
• T7030
• T7040
• T7050
• T7060

1. 1

   Visually inspect the number 2 rear remote valve block for external damage, hydraulic leaks, and loose electrical connections on the valve solenoid and position sensor.

2. 2

   Inspect the wiring harness leading to the valve for any chafing, breaks, or corrosion.

3. 3

   Check the hydraulic fluid level and condition. Sluggish hydraulic performance could point to wider system issues like a failing compensator valve on the main hydraulic pump.

4. 4

   Ensure the spool is not mechanically stuck or jammed by debris in the hydraulic oil.

5. 5

   Test the Hall effect position sensor using a diagnostic tool to monitor live data, or use a multimeter and wiring diagram to verify the presence of a 5-volt reference, a good ground, and a changing signal voltage as the valve is manually actuated.

6. 6

   If possible, and if other remotes are functioning correctly, swap the position sensor or the entire valve assembly with a known good one from another remote position to isolate whether the fault is with the component or the wiring/controller.

1. 1

   Clear fault codes

   Clear all existing fault codes and attempt to operate the remote to see if the code returns immediately. This rules out temporary glitches.

2. 2

   Attempt calibration

   Recalibrate the rear EHR valves through the tractor's instrument cluster or diagnostic display. Note that this procedure may require special tools, such as pressure transducers and jumper harnesses, on some models. If calibration fails, the system may provide a secondary error code indicating the reason for failure.

3. 3

   Address mechanical sticking

   If the spool is suspected to be sticking due to contaminated hydraulic oil, remove the valve for cleaning and inspection.

4. 4

   Replace position sensor

   If diagnostic checks point to a faulty position sensor, replace it. The sensor is often mounted on the end of the valve assembly. A calibration of the EHR valve is typically required after replacement.

5. 5

   Replace remote valve assembly

   In some cases, particularly on older models or if the internal components are worn, replace the entire remote valve assembly.