New Holland 15014 – EMU: Split Valve Spool Stuck In Transition Zone

The split valve spool within the hydraulic steering valve is stuck in a transition zone, preventing the system from accurately identifying the current steering mode of the tractor. Because the spool is not fully engaged in any of its intended positions, the tractor may experience improper steering response or a complete failure to engage the correct steering function, compromising the safe operation of the vehicle.

• TM120
• TM125
• TM130
• TM135
• TM140
• T6020
• T6030
• T6050
• T6070
• TS115A
• TB Series
• TT Series

1. 1

   Check the hydraulic fluid level and quality, as low or contaminated fluid can cause hydraulic components to stick.

2. 2

   Inspect for any hydraulic fluid leaks, especially around the steering valves and lines.

3. 3

   Examine the wiring harnesses and connectors associated with the steering control system for any signs of damage, corrosion, or loose connections.

4. 4

   Test sensors related to the steering system, such as steering angle or pressure sensors, to ensure they are functioning correctly.

5. 5

   Check if the steering system requires recalibration (often indicated if related fault code 15024 is also present).

1. 1

   Prepare machine safely

   Ensure the tractor is on a level surface, the engine is off, and the parking brake is engaged. Relieve any residual hydraulic pressure before working on the system.

2. 2

   Locate the split valve

   Identify and access the steering control valve assembly. On TM series tractors, this is typically located in a valve block.

3. 3

   Inspect the valve

   Carefully disassemble the portion of the valve block containing the split valve spool.

4. 4

   Clean and examine

   Clean all components with an appropriate solvent and inspect the spool and its bore for any signs of scoring, burrs, or contamination that could cause it to stick.

5. 5

   Replace damaged components

   If the spool or valve body is damaged, scored, or heavily worn, replace the affected components or the entire valve assembly.

6. 6

   Reassemble and test

   After cleaning or replacement, reassemble the valve assembly, ensuring all seals are correctly installed and bolts are torqued to the manufacturer's specifications.

7. 7

   System calibration

   After any repair to the steering valve system, perform a calibration of the steering system using a specialized diagnostic tool and the tractor's service menu to ensure proper operation.