Case IH 4135 – EHR (Electronic Hitch/Hydraulic Remote) / ATC (Armrest Tractor Controller): Rear Remote No.3 - Spool Deflection Excessive

The internal spool of the #3 rear remote hydraulic valve has traveled further than the commanded position or beyond its normal operating range. This indicates a valve internal fault, possibly mechanical (such as a broken centering spring), or severe fluid contamination causing the spool to stick and over-travel.

• Maxxum
• Steiger T4B
• MAXXUM T4E
• Magnum
• Case IH Magnum Series
• Case IH Steiger Series
• Case IH Maxxum Series
• Case IH MXM Series
• Case IH Puma Series

1. 1

   Verify that the operator has not been manually forcing the valve at the rear of the tractor (manual override)

2. 2

   Check the hydraulic fluid for severe contamination or debris causing the spool to stick

3. 3

   Check the position transducer for failure falsely reporting excessive deflection

4. 4

   Perform an electronic calibration of the rear remote valves via the tractor's H-Menu/display

1. 1

   Relieve Hydraulic Pressure

   Turn off the tractor and cycle the remote levers/buttons to relieve all trapped hydraulic pressure in the system.

2. 2

   Access the Valve Stack

   Locate the rear remote valve stack at the rear of the tractor. Identify slice No. 3 (usually counted from the inside out or bottom up, depending on the specific tractor chassis).

3. 3

   Disconnect Electrical Harness

   Unplug the electrical connector to the #3 electro-hydraulic valve actuator and position transducer.

4. 4

   Remove the Valve Section

   Unbolt the tie-rods holding the hydraulic valve stack together. Carefully separate the #3 valve section from the stack, ensuring you do not lose or pinch the O-rings between the slices.

5. 5

   Inspect / Replace

   Replace the entire #3 valve section, as modern electro-hydraulic proportional valves are highly sensitive and often not serviceable at the internal spool level.

6. 6

   Reassembly

   Install the new valve section with new O-rings. Torque the valve stack tie-rods to the OEM specification found in your specific model's service manual.

7. 7

   Final Calibration

   Reconnect the electrical harness, power on the tractor, and perform a mandatory hydraulic valve calibration procedure so the EHR module can learn the new valve's exact spool travel limits.