New Holland 4108 – ARU: Remote Valve 1 Float Not Achieved

The electronic control system commanded the No. 1 remote hydraulic valve to enter the float position, but the valve's position sensor did not confirm that the spool reached this state. In the float position, the valve opens to allow hydraulic fluid to flow freely in both directions, enabling an implement to follow ground contours without hydraulic pressure. Failure to achieve this position indicates a mechanical, electrical, or calibration fault preventing proper spool travel.

• T7 Series
• T7.210
• T7030
• T8 Series
• T9 Series
• TM Series
• T5 Series
• T6 Series
• Genesis Series

1. 1

   Visually inspect the remote valve, hydraulic lines, and electrical connectors for visible damage.

2. 2

   Check the hydraulic fluid level and ensure the fluid is not contaminated.

3. 3

   Ensure no external force or manual operation is holding the valve or linkage, which can trigger the code.

4. 4

   Check for other active fault codes related to the Arm Rest Module (ARU), CAN bus, or voltage issues (under/over-voltage).

5. 5

   Assess overall hydraulic system performance for weakness, slow response, jerky movements, or whining noises that could indicate restricted oil supply or air in the system.

1. 1

   Recalibrate remote valves

   Put the tractor in the specified calibration state (e.g., engine off, key on) and use the diagnostic menu or switch presses to re-synchronize the control lever with the valve spool. A special diagnostic tool may be required on some models.

2. 2

   Inspect mechanical linkage

   For models with mechanical linkages (e.g., TM series), inspect cables for wear, damage, or misadjustment. Loosen the adjustment sleeve to reposition the cable if necessary.

3. 3

   Service the detent mechanism

   Inspect the mechanical detent assembly (spring and ball) that holds the float position. Clean and lubricate the mechanism to resolve sticking caused by contamination or lack of use.

4. 4

   Test position sensor

   Test the potentiometer's electrical output against service manual specifications to ensure it is correctly reading the spool's position.

5. 5

   Inspect valve spool and driver

   If calibration and sensor tests pass, disassemble the valve to check for a sticking spool (due to contamination or wear) or a faulty electronic solenoid driver. Replace the valve assembly if internal components are damaged.