New Holland EHR 4158 – EHR (Electro-Hydraulic Remote) Controller: Rear Remote No.5 - Checksum Verification Failure

The internal memory or software of the processor on Rear Remote Valve No. 5 has failed a data integrity check. This typically indicates internal software corruption or a hard hardware failure of the valve's integrated circuit board.

• T6 series
• T7 series
• T7030
• T7040
• T7050
• T7060
• T8 series
• T8.330
• T8.360
• T8.390
• T9 series

1. 1

   Cycle the tractor's key power to see if the checksum error is a temporary software glitch. If the code returns immediately, it is a hard failure.

2. 2

   Look for accompanying fault codes. EHR 4160 (Under Voltage) or EHR 4161 (Over Voltage) indicate power issues, while EHR 4190-4194 indicate CAN-bus communication issues.

3. 3

   Inspect the wiring harness and connector plugging into Rear Remote No. 5 for moisture, corrosion, or damaged pins, which can cause data corruption.

4. 4

   Attempt to run the EHR calibration procedure via the tractor's display. Failure to calibrate confirms the valve's internal module is dead.

1. 1

   Lower all implements to the ground and relieve all hydraulic system pressure.

   Ensure the system is depressurized before beginning work.

2. 2

   Disconnect the tractor's battery to prevent electrical shorts.

   Safety precaution before disconnecting electrical components.

3. 3

   Disconnect the electrical harness connector from the Rear Remote No. 5 valve section.

   Remove the electrical connection to the faulty valve.

4. 4

   Remove the hydraulic lines and couplers attached to the rear of the valve.

   Detach the hydraulic connections.

5. 5

   Remove the tie-rod bolts holding the rear remote valve stack together.

   Unbolt the stack to access the individual valve sections.

6. 6

   Carefully separate the stack and slide out the faulty Remote No. 5 valve section.

   Ensure no dirt or debris enters the exposed hydraulic galleries during removal.

7. 7

   Install the new replacement EHR valve section.

   Ensure new O-rings are placed between the valve slices.

8. 8

   Reassemble the valve stack and torque the tie-rod bolts to the manufacturer's specifications.

   Secure the valve stack back together.

9. 9

   Reconnect the hydraulic lines and the electrical harness.

   Restore all physical and electrical connections.

10. 10

    Program the processor's memory and assign it as 'Valve No. 5'.

    Crucial Step: Replacement valve assemblies are supplied 'blank'. You must use the tractor's display or a diagnostic service tool to program the processor's memory.

11. 11

    Perform the standard EHR spool calibration procedure.

    Learn the neutral, extend, and retract limits for the new valve.