Case IH 4149 – EHR (Electronic Hitch/Hydraulic Remote) / ATC (Armrest/Tractor Controller): Rear Remote No.4 - Spool Deflection Excessive

The internal position sensor (potentiometer or transducer) on the #4 electronic remote valve is detecting that the hydraulic spool has traveled beyond its normal, calibrated physical limits. This is typically caused by an internal mechanical failure, debris physically wedging the spool open, or a faulty position transducer sending an out-of-range signal.

• Maxxum
• Steiger T4B
• MAXXUM T4E
• Magnum
• Magnum 235 - 340 (Series 4)
• Steiger (350 to 600 horsepower models)
• Puma (165, 180, 195, 210, 225 CVX)
• Maxxum (MXM 120, 130, 140, 155, 175, 190)

1. 1

   Check for manual override: Verify if the valve has been operated manually using the override pins on the back of the valve block, which can push the spool past its electronic limits.

2. 2

   Clear the fault code and run the EHR remote valve calibration procedure via the tractor's display/H-Menu to rule out a temporary glitch.

3. 3

   Check the wiring harness at the #4 remote valve for shorts, undervoltage, or overvoltage.

4. 4

   If calibration fails, inspect for mechanical binding or a failed sensor.

1. 1

   Depressurize the System

   Turn off the tractor, lower all implements, and relieve hydraulic pressure by cycling the remote levers/buttons.

2. 2

   Inspect the Actuator Head

   Locate Rear Remote Valve #4 on the rear hydraulic stack.

3. 3

   Remove the Electronic Actuator

   Unplug the 4-pin connector from the proportional actuator head. Unbolt the actuator head from the valve slice.

4. 4

   Inspect the Spool and Spring

   With the actuator removed, check the mechanical spool inside the valve body. Ensure it moves freely and springs back to the neutral position. If the centering spring is broken or debris is jamming the spool, the valve slice will need to be disassembled, cleaned, or replaced.

5. 5

   Replace the Actuator/Transducer

   If the mechanical spool is perfectly fine, the fault lies within the position transducer located inside the electronic actuator head. Replace the actuator head.

6. 6

   Reassemble and Calibrate

   Install the new actuator or valve slice, plug in the harness, and perform the mandatory EHR valve calibration procedure so the controller can learn the new spool travel limits.