New Holland 15501: Secondary Steering Pressure High When Pump Is Not Running

The system detects an abnormally high secondary steering pressure when the pump is not operating. This indicates that the control module is receiving a signal from a pressure sensor showing high pressure in the secondary steering circuit at a time when no pressure should be present. This condition typically points to either a faulty sensor sending an incorrect reading or actual residual pressure trapped in the hydraulic system.

• T9 Series
• T9.450
• T9.615
• T9.700

1. 1

   Check the hydraulic fluid level to ensure it is within the recommended range and inspect for any signs of contamination.

2. 2

   Thoroughly inspect all hydraulic lines, fittings, and components in the steering system for any leaks.

3. 3

   Inspect the wiring harness and connectors to the secondary steering pressure sensor for any visible damage, corrosion, or loose connections.

4. 4

   Test the pressure sensor with a multimeter to ensure it is functioning within its specified range.

1. 1

   Locate pressure switch

   Identify and locate the secondary steering pressure switch within the hydraulic circuit of the steering system.

2. 2

   Release residual pressure

   Safely release any potential residual pressure in the hydraulic system according to the manufacturer's guidelines in the service manual.

3. 3

   Replace pressure switch

   If diagnostic checks point to a faulty sensor, replace the pressure switch for the steering circuit.

4. 4

   Inspect and clean hydraulic system

   If the issue persists after replacing the sensor, there may be a blockage or a faulty valve in the steering system. Inspect the relevant hydraulic valves and consider a hydraulic system flush if the fluid is contaminated.

5. 5

   Calibrate and test

   After any repairs, calibrate the steering system if required by the service manual and test the tractor to ensure the fault has been resolved.