Case IH EHR4308 – EHR (Electronic Hitch Control) / Remote Valve Controller: Rear Remote No. 6 - Spool Deflection Excessive

The fault code EHR4308 indicates a problem within the electro-hydraulic remote (EHR) valve for the sixth remote circuit. It is logged when the position sensor on the remote valve's spool reports a travel distance greater than the expected maximum. This excessive spool deflection can disrupt the normal operation of the hydraulic function controlled by this remote.

• Magnum 235
• Magnum 250
• Magnum 260
• Magnum 280
• Magnum 290
• Magnum 310
• Magnum 340
• Magnum 370
• Magnum 380
• T8.275
• T8.300
• T8.320
• T8.330
• T8.350
• T8.360
• T8.380
• T8.390
• T8.410
• T8.420
• T8.435

1. 1

   Perform a visual inspection around the No. 6 rear remote valve for any signs of hydraulic fluid leaks, particularly around the valve body and fittings, which could indicate a failed o-ring or seal.

2. 2

   Check for internal leakage within the valve cartridge, which can sometimes manifest as multiple hydraulic hoses popping out of their couplers simultaneously when a remote is activated.

3. 3

   Check the tractor's hydraulic system health, ensuring proper hydraulic fluid level and condition, and replace the hydraulic filter if necessary.

4. 4

   Inspect the electrical connector at the No. 6 remote valve for corrosion, damage, or a loose connection.

1. 1

   Safety First

   Before beginning any work, ensure the tractor is on a level surface, the engine is off, and the hydraulic pressure is relieved.

2. 2

   Access the Valve

   Depending on the tractor's configuration, you may need to move the inner rear wheel to gain sufficient access to the remote valves.

3. 3

   Disassemble the Valve

   Disconnect the control cable from the valve. Remove the screws holding the detent housing on the bottom of the valve to remove the complete spool and detent assembly. Be cautious of a spring that may be located inside the valve.

4. 4

   Inspect and Replace Seals

   With the spool assembly removed, you can access the seals. Forum discussions and videos suggest that leaking detent piston seals are a common failure point. Remove snap rings and springs to access and replace o-rings and Teflon rings within the valve body.

5. 5

   Inspect and Replace Cartridge

   If the seals are not the issue, or if there is significant internal leakage, the valve cartridge itself may need to be replaced. The cartridge can be removed after taking out the retaining spring.

6. 6

   Reassembly

   Carefully clean all components before reassembly. Lubricate new o-rings and seals with hydraulic fluid before installation to prevent damage. Reassemble the valve in the reverse order of disassembly, ensuring all springs and retainers are correctly seated. Reconnect the control cable and test the operation of the remote valve.