New Holland T8010 Manual page 1459

Left Draft Pin No Load Offset Voltage Outside Normal Range
Cause:
During calibration, the 'No Load' offset voltage is outside normal range for left draft pin.
The draft control requires that the 'No load' voltage is 3.00 +/- 0.05 volts to ensure the draft quality.
The AUX/Hitch/PTO controller will check it during calibration.
Possible failure modes:
1. Left draft pin failed.
2. Wiring problem from the AUX/Hitch/PTO controller to the left hand draft pin.
Solution:
The 'No Load' offset point can be permanently shifted if the draft pin is installed backward and overloaded. The pin
signal can be checked by using a Y harness or using the monitoring screen of the service tool.
If the signal exists but just slightly beyond the range (say in the range 2.3 - 3.7 volts), the wiring is OK, but pin has
failed.
If there is no signal or signal is far beyond the range, it can either be pin failure or wiring problems.
1. Use a Y harness:
Plug in the Y harness at the pin connector(C154). Cavity A is the ground, cavity B is the draft pin signal, and
cavity C is the power supply (+8 VDC).
a) Check the power supply at cavity C. If the +8 VDC is not present, check the wiring from C154 to Pin 31 of
C057.
b) Check the function of the left draft pin.
Replace the pin in any of the following cases:
No signal output.
Signal not within 2.95 to 3.05 when there is no load.
The output does not change with the load change.
2. Use the service tool:
Go to the Monitor screen, click the Monitor Icon.
Click the CHANGE PARAMETER SELECTIONS Icon.
Click the HITCH DRAFT PIN-LEFT-VOLTAGE and then ADD. You will be able to monitor the left draft pin signal
status on the screen.
The voltage should be 2.95 to 3.05 when there is no load.
The voltage should change with the load change in the range of 2.3 to 5.3 VDC at -60 KN to 160 KN.
3. Check the function of the draft pin.
a) If a spare draft pin is available, unplug the pin connector (C154). Plug in the new pin, clear the fault codes,
start the tractor, and enable hitch. Lower and raise the hitch a few times.
If the fault code is not recorded, the draft pin failed.
If the fault code is recorded again, check the wiring.
b) If there is no fault code AUX/Hitch/PTO 23, that means the right draft pin is working. Use the right pin as the
test pin and repeat the above test.
4. Check the wiring from the AUX/Hitch/PTO controller to the left hand draft pin.
a) Disconnect the pin connector (C154). At the controller side, check the power supply across cavity C and A.
It should be 8 volts.
b) Check the continuity from C154 to C057 and C053.
c) At the draft pin side, measure the continuity of the pin circuit. The resistance should be 180 kohm across A
and C and 18 kohm across B and C.
NOTE: Always inspect connector ends for damaged, bent or dislocated pins when troubleshooting.
NOTE: The resistances at the draft pin side are for reference only. Incorrect resistance means a bad pin but some
bad pins may have correct resistances.
NOTE: See schematic sections 51 and 52 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 58
55-3-40