New Holland NH 1020 – EDC (Electronic Draft Control) module: Load sensing pin voltage too high

The returned signal voltage from the load sensing pin exceeds the programmed upper limit (short to +12 Volt or an 8V reference voltage that is too high), causing the system to disable draft control.

• T5
• T5.95
• T5.105
• T5.115
• T6
• T7
• T8
• T9
• TM
• TG
• 60 series

1. 1

   Visually inspect the wiring harness and connectors leading to the lower link load sensing pins for corrosion, water ingress, or chafing that could cause a short to +12V.

2. 2

   Verify the main earth/ground connections at the battery and at the back of the cab. Bad grounds are a known cause of intermittent high-voltage EDC errors.

3. 3

   Measure the supply voltage at the pin connector. It should receive an 8V (or 8.5V) reference voltage.

4. 4

   Measure the signal voltage returning to the controller. With no load on the pin, the signal voltage should be exactly half of the supply voltage.

5. 5

   Test the internal resistance of the pin. For a standard 60 kN pin, resistance between pins 1 and 3 should be approximately 9170 Ω; between pins 1 and 2 should be 178 Ω; and between pins 2 and 3 should be 178 Ω. If it fails these checks, the internal strain gauge has failed.

1. 1

   Disconnect battery

   Disconnect the tractor's battery.

2. 2

   Disconnect harness

   Disconnect the electrical harness from the faulty load sensing pin.

3. 3

   Remove faulty pin

   Remove the retaining hardware (flange bolts/snap rings) and slide the faulty load sensing pin out of the lower link arm draft bracket.

4. 4

   Clean mounting bore

   Clean the mounting bore thoroughly to ensure the new pin seats without binding.

5. 5

   Install new pin

   Install the new load sensing pin. Note: The fixing flange ensures correct pin orientation; it is directional and must be installed in the correct position to measure the load properly.

6. 6

   Reconnect harness and battery

   Reconnect the wiring harness and the battery.

7. 7

   Perform Autocalibration

   Perform the Hydraulic Lift Autocalibration (must be completed before the hitch will operate normally, often clearing code NH 1024).

8. 8

   Disconnect harness (Alternative Repair)

   If installing a Draft Load Sensing Pin Elimination Kit (for tasks not requiring draft sensing), disconnect the harness from the faulty pins.

9. 9

   Install elimination modules

   Plug the elimination modules directly into the tractor's wiring harness to send a permanent 'zero load' signal back to the EDC.

10. 10

    Secure modules

    Secure the modules and wiring out of the way using tie wraps.