New Holland TMF 7 – TMF (Tractor Multi-Function) Controller: Hitch Raise/Lower Solenoids Open or short to ground

Indicates a failure in the electrical circuit controlling the solenoid valves that raise and lower the rear 3-point hitch. The controller is detecting that the circuit is either physically broken (open circuit) or that the wiring/solenoid is shorting out to the chassis ground.

• T5 series (T5040, T5050, T5060, T5070)
• T6 series (T6010-T6080)
• T7 series
• T8 series (T8010, T8020, T8030, T8040, T8050)
• TG series (TG215, TG275)
• TM/MXM series

1. 1

   Locate the hitch valve block at the rear of the tractor and identify the raise and lower solenoids.

2. 2

   Visually inspect the wiring harness and the 2-pin female electrical connectors leading to the solenoids for corrosion, broken wires, or loose connections.

3. 3

   Use a multimeter to test the wiring between the TMF controller and the solenoids for continuity. Check for any shorts to ground along the harness.

4. 4

   Test the internal resistance of the hitch raise and lower solenoids to determine if the coil inside the solenoid has failed open or shorted.

1. 1

   Secure the Machine

   Park the tractor on a level surface, lower the hitch (if possible) or mechanically support it, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the Fault

   Based on your multimeter tests, isolate whether the fault is in the wiring harness or the solenoid itself.

3. 3

   Repair Wiring (If Applicable)

   If the harness is chafed or shorting to the frame, repair the damaged section of the wire and replace the 2-pin connector if it is corroded or melted.

4. 4

   Replace the Solenoid (If Applicable)

   If the solenoid fails the resistance test, remove the retaining nut/clip holding the solenoid coil to the hitch valve block stem. Slide the old solenoid off and install the replacement.

5. 5

   Reassemble and Test

   Reconnect the 2-pin electrical connector, reconnect the battery, and clear the fault codes from the TMF controller. Test the hitch raise and lower functions to ensure the code does not return.