New Holland T8010 Manual page 1452

PWM Raise Threshold Is Too High During Calibration
Cause:
During calibration, PWM threshold to start hitch raising is above the limit (55%).
Possible failure modes:
1. Raise solenoid coil resistance is too high.
2. Wire harness or connector problem between hitch raise solenoid and hitch controller.
3. Battery voltage is very low.
4. Hitch valve raise portion is stuck closed.
Solution:
Make sure the calibration procedure is correct. Then do the following for troubleshooting.
1. Make sure the battery voltage and the alternator output voltage is above 9.8 volts DC.
Refer to fault code AUX/Hitch/PTO 65 for battery voltage troubleshooting procedures.
2. Test the hitch raise solenoid coil (C151) and its wiring for high resistance or openings.
Refer to fault code AUX/Hitch/PTO 4 troubleshooting procedures for details.
3. Make sure there is proper hydraulic pressure to the hitch valve.
Check for valve failure (solenoid spool or the valve main spool stuck closed).
Repair or replace the spools or the valve according to the problem.
NOTE: See schematic sections 51 and 52 on the schematic poster.
PWM Raise Threshold Is Too Low During Calibration
Cause:
During calibration, PWM threshold to start hitch raising is below the limit (6%).
Possible failure modes:
1. Raise solenoid coil resistance is too low.
2. Battery voltage is very high.
3. Valve failure.
Solution:
Make sure the calibration procedure is correct. Then do the following for troubleshooting.
1. Test battery voltage and the alternator output voltage (must be less than 14.7 volts DC).
2. Test raise solenoid coil (C151) for low resistance. The resistance should be 6.4 to 6.8 ohms.
Refer to fault code AUX/Hitch/PTO 4 troubleshooting procedures for details.
3. Make sure there is proper hydraulic pressure to the hitch valve.
Check for valve failure (center spring broken, spool too loose).
Repair or replace the spools or the valve according to the problem.
NOTE: See schematic sections 51 and 52 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 47
AUX/HITCH/PTO FAULT CODE 48
55-3-33