New Holland TMF 136 – TMF Controller: Aux 4th Lower solenoid failed open or short circuit.

The controller has commanded the Auxiliary #4 driver to turn ON, but no electrical current is being sensed. This indicates that the retract/lower coil on the 4th auxiliary remote valve has an open circuit or is shorted to ground.

• T8010
• T8020
• T8030
• T8040
• T8050
• TG215
• TG245
• TG275
• TG305

1. 1

   Visually inspect the wiring harness and components leading to the 4th auxiliary remote valve for physical damage, pinched wires, or loose connections.

2. 2

   Use a multimeter to test the retract/lower solenoid coil on the 4th remote valve for an open circuit (infinite resistance) or a short to ground.

3. 3

   Verify continuity between the TMF controller pins and the solenoid connector to rule out a broken wire in the main harness.

1. 1

   Power Down

   Turn off the tractor and disconnect battery power before servicing the electro-hydraulic system.

2. 2

   Access the Valve Stack

   Locate the auxiliary remote valve stack at the rear of the tractor and identify the 4th remote valve section.

3. 3

   Wiring Repair

   If the diagnostic checks revealed damaged wiring or a corroded connector, repair or replace the damaged section of the harness.

4. 4

   Solenoid Replacement

   If the wiring is intact but the solenoid coil is open or shorted, remove the retaining nut/hardware holding the lower/retract solenoid coil to the 4th remote valve cartridge and replace it with a new coil.

5. 5

   Reassembly

   Reconnect the wiring harness to the new solenoid and restore battery power.

6. 6

   Mandatory Calibration

   Perform the remote hydraulic calibration procedure via the tractor's display/monitor before returning the machine to service.