New Holland TMF 124 – TMF (Tractor Management Facility) / AUX: Aux 1st Lower solenoid failed open or short circuit

The Auxiliary #1 driver is commanded ON by the controller, but no electrical current is being sensed. This indicates that the retract/lower coil circuit for the first remote valve is either completely broken (open circuit, such as a disconnected plug or burnt-out coil) or it is shorted directly to the ground.

• New Holland T6
• New Holland T7
• New Holland T8
• New Holland T9
• New Holland MXM Series
• New Holland TM Series

1. 1

   Visually inspect the #1 Auxiliary remote valve block wiring harness and connector for disconnected plugs, corrosion, or broken wires.

2. 2

   Perform a harness continuity and short test between the TMF/AUX controller and the solenoid connector.

3. 3

   Measure the resistance across the pins of the 1st Lower solenoid coil to check for an open circuit (OL).

4. 4

   Command the #1 remote to the 'Lower' position with the tractor running and verify if 12 volts are reaching the connector.

1. 1

   Power Down

   Turn off the tractor, relieve all hydraulic pressure from the remote valves, and disconnect the battery to prevent electrical spikes.

2. 2

   Locate the Valve

   Identify the #1 remote valve stack at the rear of the machine. Identify the specific solenoid responsible for the 'Lower/Retract' function.

3. 3

   Remove the Solenoid

   Disconnect the electrical connector from the failed solenoid. Remove the retaining nut or cap screw at the end of the solenoid stem.

4. 4

   Slide off the Coil

   Carefully slide the electromagnetic coil off the hydraulic valve cartridge. (Note: You usually do not need to open the hydraulic system or remove the cartridge valve itself just to replace the coil).

5. 5

   Install the New Part

   Slide the new solenoid coil onto the cartridge stem. Install and tighten the retaining nut to the OEM torque specification.

6. 6

   Reconnect and Clear

   Plug the electrical connector back in. Reconnect the battery, turn on the tractor, and use a diagnostic tool or the tractor's armrest display to clear the TMF 124 inactive fault code.

7. 7

   Test

   Actuate the #1 remote valve to ensure proper lowering/retracting function and verify the code does not return.