New Holland 4107 – EHR: Rear Remote No.1 Spool Movement Too High

The Electronic Hydraulic Remotes (EHR) controller has detected excessive movement from the spool in the number 1 rear remote valve. The position sensor (potentiometer) located in the pilot head is sending a voltage signal higher than the maximum expected value stored in the controller's memory from its last calibration. This indicates that either the spool has physically traveled too far, or the sensor is reporting an erroneously high position.

• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T8 Series
• TM120
• TM130
• TM140
• TM155
• TM175
• TM190

1. 1

   Check the diagnostic menu for other active or stored fault codes. Codes related to potentiometers (4111), driver faults (4110), or voltage issues (4104, 4105) are particularly relevant.

2. 2

   Visually inspect the wiring harness and connectors leading to the number one rear remote valve for damage, corrosion, or loose connections that could cause erratic potentiometer signals.

3. 3

   Test the potentiometer (spool position sensor) with an ohmmeter. Check the resistance between the center wire and one of the outer wires of the potentiometer's three-wire plug. As you manually (if possible) or hydraulically move the spool, the resistance should change smoothly. Any sudden jumps, drops to zero, or infinite resistance readings indicate a faulty potentiometer.

4. 4

   Check for mechanical issues by ensuring the spool itself is not sticking or binding within the valve body.

1. 1

   Address electrical issues

   If diagnostic checks reveal a faulty potentiometer or damaged wiring, replace the affected component. Note that the potentiometer is often integrated into the valve assembly.

2. 2

   Perform EHR valve calibration

   After replacing a valve or if diagnostics do not point to a specific failure, calibrate the electronic hydraulic remote valves (accessed via the 'HJ' menu on T7 series). This process may require clearing existing valve numbers and re-programming the sequence by disconnecting the harness from all valves and reconnecting them one by one as prompted by the system.

3. 3

   Clear fault codes

   After performing repairs and calibration, clear all stored error codes using the tractor's diagnostic menu (often the 'HC' menu).

4. 4

   Test operation

   Operate the number one rear remote valve through its full range of motion to ensure the fault code does not reappear.