New Holland T8010 Manual page 1457

Ratio Of Position Command To Rockshaft Range Is Not Within Specification
Cause:
During calibration, the ratio of rockshaft position range to position command potentiometer range is not within
specifications.
Possible failure modes:
1. Rockshaft potentiometer has failed.
2. Rockshaft potentiometers shaft is loose from the lever.
3. Position command potentiometer failed at the arm controller.
4. Position command potentiometers shaft is loose from the lever.
Solution:
Make sure there is no mechanical interference in the hitch linkage.
Check for rockshaft potentiometer failure and hitch linkage problems.
Check for the position command potentiometer function and linkage problems.
1. Check hitch linkage for mechanical interference. Make sure there is no external object that may cause the hitch
out of range.
2. Check for the linkage problem of the rockshaft potentiometer.
a) Check the linkage from the rockshaft to the potentiometer. Make sure it is not loose, damaged, or improper
installed.
b) Adjust rockshaft position potentiometer to 0.80 +/- 0.10 volts when hitch is fully lowered.
c) Tighten set screw on rockshaft potentiometer.
3. Test the function of the rockshaft potentiometer.
Signal output from 0 to 5 VDC (1/24 volts per degree) at pin B when pin A is connected to power supply and pin
C is grounded.
Disconnect the rockshaft potentiometer at C155.
The resistance is about 4 kohm measured across pins A and C.
The resistance increase with clockwise rotation from 0 to about 4 kohm measured across pin B and C.
Turn potentiometer along the full working range, the multimeter reading must be smooth and continuous.
4. Test the wiring harness of the rock shaft potentiometer.
a) Disconnect connectors C056, C057 and C058 from the AUX/Hitch/PTO controller. The resistance between
C056 pin 18 and C058 pin 2 should be around 4 kohm. The resistance between C057 pin 2 and either C058
pin 2, or C056 pin 18 should change from 0 to 4 kohm as the pot shaft changes position.
b) Test the continuities between the following connectors:
C056 pin 18 to C155 pin A
C057 pin 2 to C155 pin B
C058 pin 2 to C155 pin C
The three wires should all have good continuity.
NOTE: Always inspect connector ends for damaged, bent or dislocated pins when troubleshooting.
5. Check for position command potentiometer problem at the arm controller.
Refer to fault code ARM 69 for potentiometer information, routing information, and diagnosing procedures.
NOTE: See schematic sections 51 and 52 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 56
55-3-38