New Holland 4108 – ACM: Remote No.1 Float Position Not Reached

The electronic control system has commanded the No. 1 rear remote hydraulic valve to enter the float position, but the position sensor on the valve has not confirmed that the spool reached this position. This discrepancy between the commanded state and the actual physical position of the valve spool indicates a failure in the operation or positioning of the component, preventing the hydraulic cylinder from moving freely to let an implement follow the ground's contour.

• T7 Series
• T8 Series
• T9 Series

1. 1

   Verify the operator is correctly attempting to engage the float position (lever must be pushed fully forward past the detent on some systems)

2. 2

   Check if the manual override on the valve body has been engaged, which prevents electronic control

3. 3

   Inspect the hydraulic system to ensure oil is at the correct operating temperature and fluid levels are adequate

4. 4

   Visually inspect for external leaks around the No. 1 remote valve block

5. 5

   Check the wiring harness and electrical connectors leading to the No. 1 remote valve for damage, corrosion, or loose connections

6. 6

   Verify battery voltage and grounds, as poor power supply can cause erroneous electronic faults

1. 1

   Calibrate EHR valve

   Initiate an electro-hydraulic remote (EHR) valve calibration through the tractor's display monitor. This allows the control module to re-learn the end-of-travel positions for the valve spool, including the float position. If calibration fails, proceed to mechanical/electrical checks.

2. 2

   Inspect mechanical detent mechanism

   Check the mechanical detent that holds the float position. Look for a stuck detent ball or a weak/broken spring within the valve assembly. Clean and lubricate these components, which may require disassembling the valve end cap for access.

3. 3

   Test valve solenoid

   Check the resistance of the solenoid coils with a multimeter. An open circuit or a short indicates a failed solenoid that must be replaced.

4. 4

   Test position sensor (potentiometer)

   Back-probe the potentiometer's connector and monitor the signal wire with a multimeter set to DC volts, or disconnect it and measure resistance between the signal pin and ground/reference pins. As you manually move the spool, the reading should change smoothly without sudden jumps or dropouts.

5. 5

   Inspect valve spool

   If electrical components test correctly, carefully disassemble the valve stack to inspect for a sticking valve spool caused by hydraulic fluid contamination or worn O-rings. Clean the assembly and replace all O-rings and seals before reassembly.