New Holland TMF 59 – TMF (Tractor Multi-Function) Controller: Both Draft Pin voltages are not within spec for ‘no load’ condition during calibration

During the hitch calibration procedure, the controller is reading a baseline voltage from both the left and right draft pins (load sensors) that falls outside the acceptable programmed parameters for an unloaded state.

• TG210
• TG230
• TG255
• TG285
• TG305
• T8010
• T8020
• T8030
• T8040
• T8050
• TM120
• TM130
• TM140
• TM155
• TM175
• TM190
• T6 Series
• T7 Series

1. 1

   Verify 'No Load' State: Ensure there is absolutely no implement attached to the 3-point hitch and that the hitch is completely free to move without binding.

2. 2

   Harness & Connector Inspection: Check the wiring harness and connectors leading to both the left and right draft pins for physical damage, corrosion, or short circuits.

3. 3

   Reference Voltage Check: Check the reference voltage supplied to the draft pins by the TMF controller. Depending on the specific tractor model, this should be a steady 5-volt or 8-volt reference.

4. 4

   Sensor Check: If the wiring and reference voltages are intact, the draft pins themselves have likely failed internally or drifted out of calibration range.

1. 1

   Remove Implements

   Disconnect any implements from the 3-point hitch to ensure a true 'no load' condition.

2. 2

   Repair Wiring

   If diagnostic checks revealed damaged wiring or corroded connectors at the lower link arms, repair or replace the affected harness sections.

3. 3

   Replace Draft Pins

   If the harness is good, replace the faulty draft pin sensors on the lower hitch links.

4. 4

   Recalibrate

   After replacing the sensors or repairing the wiring, you must perform the Hitch Calibration procedure.

5. 5

   Alternative Bypass (Optional)

   If the tractor is used in an application where draft control is never needed (e.g., pulling a feed wagon), aftermarket 'Draft Load Sensing Pin Elimination Kits' can be installed. These plug into the harness to send a fixed 'no load' voltage to the TMF controller, permanently bypassing the sensors and clearing the code.