John Deere 523833.03 – HCU: Rear Hitch Maximum Height Dial Voltage Issue

The voltage signal from the rear hitch maximum height dial (or height-limit sensor) is above the normal operating range or shorted to a high source, which disables or impairs the operator's ability to set the maximum raise height of the rear 3-point hitch.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 5090M
• 5100M
• 5100MH
• 5100ML
• 5115M
• 5065M
• 5075M
• 5085M
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5070M
• 5080M
• 5120M
• 5130M
• 5225
• 5325
• 5425
• 5525
• 5625
• 5725

1. 1

   Inspect the wiring harness and connectors between the HCU and the rear hitch maximum height dial/sensor for corrosion, bent pins, moisture intrusion, or chafed wires.

2. 2

   Verify that the sensor ground circuit is intact. An open ground wire will cause the sensor's signal voltage to float high.

3. 3

   Measure the sensor supply voltage to ensure it is within specification (typically 5V).

4. 4

   Unplug the height dial/sensor. If the fault code changes from .03 (Voltage High) to .04 (Voltage Low), the sensor/dial itself has failed internally. If the code remains .03, there is a short to power in the wiring harness.

1. 1

   Power Down

   Turn off the tractor and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Harness Repair

   If the diagnostic checks revealed a short to power or a broken ground in the harness, repair the damaged wire or replace the affected harness section.

3. 3

   Sensor Replacement

   If the sensor/dial is faulty, locate the maximum height dial/potentiometer. Remove the retaining hardware and disconnect the electrical pigtail.

4. 4

   Installation

   Install the new potentiometer/sensor and secure the mounting hardware. Reconnect the electrical connector.

5. 5

   Reassembly

   Reconnect the negative battery cable.

6. 6

   Calibration

   You must perform a rear hitch calibration procedure after replacing hitch position sensors or dials. Without calibration, the HCU will not recognize the new sensor's voltage sweep, and the hitch will not operate correctly.