Case IH 15520 – Tractor Multi-Function (TMF) controller, Armrest controller, or a specific hydraulic controller: Error Checking the Pressure of the Pump of the Auxiliary Control System

The control unit has detected an anomaly in the pressure readings from the auxiliary hydraulic pump. This indicates that the hydraulic pressure is outside of its expected range, or there is a malfunction with the pressure monitoring sensor providing the reading to the system.

• Magnum
• Puma
• Steiger
• Quadtrac
• Maxxum

1. 1

   Verify hydraulic fluid level is correct and inspect fluid for contamination

2. 2

   Visually inspect all hydraulic lines, fittings, and components associated with the auxiliary system for leaks

3. 3

   Check hydraulic filters for clogs that could restrict fluid flow

4. 4

   Perform pressure and flow testing using gauges (operating pressure should typically be between 2,800–3,500 PSI)

5. 5

   Inspect the wiring harness and connectors leading to the auxiliary hydraulic pressure sensor(s) for damage, corrosion, or loose connections

1. 1

   Address basic hydraulic issues

   If low fluid, leaks, or clogged filters were found, rectify these first. Refill hydraulic fluid, tighten fittings or replace damaged hoses, and replace dirty hydraulic filters.

2. 2

   Test or replace pressure sensor

   With the machine off, disconnect the auxiliary hydraulic pressure sensor and check pins for corrosion. Test the sensor's output with a multimeter against service manual specifications. Replace the sensor if it is faulty or cannot be reliably tested.

3. 3

   Inspect hydraulic pump and relief valve

   If the sensor is functioning properly but pressure tests indicate a drop under load, inspect the pressure relief valve to ensure it is not opening prematurely, and inspect the hydraulic pump for wear.

4. 4

   Clear fault codes

   After completing repairs, clear the fault codes using a diagnostic tool or the tractor's onboard diagnostics menu. Operate the equipment under normal conditions to verify the issue is resolved.