New Holland EHR 4308 – EHR: Rear Remote No.6 - Spool Deflection Excessive

This fault indicates that the internal spool of the #6 rear auxiliary remote valve has traveled further than commanded or expected. The valve's position is monitored by an LVDT (Linear Variable Differential Transformer) position transducer. When the EHR controller reads a voltage from the LVDT that exceeds the calibrated maximum travel limit, it triggers this code. This is typically caused by a mechanical internal fault, such as a sticking or binding spool due to debris or scoring, or a failing LVDT position sensor.

• New Holland T6
• New Holland T7
• New Holland T8
• New Holland T6000
• New Holland T7000

1. 1

   Check for related electrical codes, such as EHR 4312 (Rear Remote No.6 - Position Transducer Faulty) or voltage faults, which point to an electrical issue rather than a mechanical spool issue.

2. 2

   Inspect the wiring harness and connector at the #6 rear remote valve for corrosion, moisture, or pushed pins.

3. 3

   Test the LVDT sensor resistance and 5V reference voltage to ensure the sensor is not shorted or open.

4. 4

   Attempt to manually operate the valve (if equipped with manual overrides) to feel for mechanical binding or sticking.

5. 5

   Check the hydraulic oil for contamination, as debris in the hydraulic fluid is a leading cause of sticking spools.

6. 6

   Attempt to perform a remote valve calibration procedure via the tractor's instrument cluster or diagnostic tool. If the valve fails calibration, the internal sensor or spool is definitively faulty.

1. 1

   Relieve hydraulic pressure

   Lower all implements to the ground, turn off the tractor, and relieve all hydraulic pressure from the system by cycling the remote levers/switches.

2. 2

   Disconnect electrical harness

   Disconnect the electrical harness from the #6 rear remote valve slice.

3. 3

   Remove hydraulic lines

   Remove the hydraulic lines connected to the #6 remote.

4. 4

   Extract valve section

   Unbolt the tie-rods/mounting bolts holding the remote valve stack together and carefully extract the #6 valve section (slice).

5. 5

   Inspect and clean spool (if servicing)

   Disassemble the valve section on a clean bench. Clean the spool and bore thoroughly. Inspect for scoring or metal debris. If heavily scored, the entire valve section must be replaced.

6. 6

   Replace LVDT or valve section

   Install the new LVDT sensor or the complete replacement valve section.

7. 7

   Reassemble valve stack

   Reassemble the valve stack, torque the tie-rod bolts to OEM specifications, and reconnect the hydraulic lines and electrical connector.

8. 8

   Refill and bleed hydraulics

   Top off the hydraulic fluid and bleed the system.

9. 9

   Calibrate EHR valve

   You must perform the EHR valve calibration procedure using the tractor's diagnostic interface so the controller can learn the new spool's neutral, extend, and retract end-of-travel positions.