New Holland 126 – TMF: Aux 1st Raise solenoid failed open or short circuit

The electronic control module has detected that the electrical circuit for the first auxiliary hydraulic valve's 'raise' solenoid is either open (a break in the wiring or internal coil) or shorted (wiring making an unintended connection to ground or another wire). This electrical failure prevents the proper electronic command and operation of the hydraulic function.

• T-Series
• T7
• T8
• TM Series
• MX/TG series

1. 1

   Visually inspect the wiring harness leading to the first auxiliary hydraulic valve block for chafing, cuts, pinch points, or corrosion on the connectors, and ensure the connector is securely attached.

2. 2

   Perform a 'click test' by having an assistant operate the Aux 1st Raise control while listening for an audible click at the solenoid, or feeling for a magnetic pull on the retaining nut with a screwdriver.

3. 3

   Check for stable voltage by ensuring the tractor's battery is fully charged (above 12.6V) and that main chassis and cab grounds are clean and tight to prevent erroneous codes.

4. 4

   Perform a resistance test (power off) by disconnecting the solenoid and measuring across its two pins. A normal 12V DC coil reads 3-6 Ohms. 'OL' indicates an open circuit, and near zero indicates a short.

5. 5

   Perform a voltage test (power on) by back-probing the connected terminals while an assistant activates the function. Battery voltage (~12V) should be present; lack of voltage indicates a wiring or TMF controller issue.

1. 1

   Relieve hydraulic pressure and disconnect battery

   Cycle the hydraulic controls with the engine off to relieve all pressure from the system. Disconnect the tractor's battery to prevent electrical hazards.

2. 2

   Locate and remove the old solenoid

   Identify the first valve section on the hydraulic remote valve block. Disconnect the electrical connector, carefully remove the retaining nut from the valve stem using a wrench, and slide the solenoid coil off (expect minor fluid seepage).

3. 3

   Install the new solenoid

   Clean the mounting surface on the valve body. Slide the new solenoid coil onto the valve stem, ensuring correct orientation.

4. 4

   Secure and reconnect

   Reinstall the retaining nut and tighten to manufacturer specifications (do not overtighten). Reconnect the electrical harness connector until it clicks securely into place.

5. 5

   Test and clear codes

   Reconnect the battery, start the tractor, and test the first auxiliary remote valve function. Check for hydraulic leaks. Use a diagnostic tool to clear the fault code from the TMF controller's memory.