New Holland T8010 Manual page 1602

Regulated system pressure below 290 PSI
Cause:
The transmission controller monitors the regulated system pressure. If the pressure drops below 290 PSI, this fault
code will be recorded.
Possible failure modes:
1. Transmission regulated pressure dropped.
2. Pressure sensor or its circuit has problem.
Solution:
1. Check the transmission regulated pressure. See section 8001.
If the regulated pressure is low, following the hydraulic troubleshooting procedures.
If the regulated pressure is within the specified range but the fault code still appears, check the system pressure
sensor and its circuit.
2. Troubleshooting by viewing the Instrumentation display.
The regulated system pressure can be viewed in the instrumentation cluster display.
Use the TRANS view to view the pressure.
A. With the tractor in PARK, slowly move the throttle lever from low idle to high idle and then from high idle to
low idle. The pressure should be 70 to 200 kPa (10 to 30 PSI) higher in high idle than in low idle.
If the pressure follows the change of the throttle, it is more likely a hydraulic problem.
If the pressure does not follow the change of the throttle, it is more likely the sensor or its wiring problem.
B. Make sure that it is safe for the tractor to move during testing. Shift through gears.
At each shift, the pressure should have a sudden drop to fill the clutch. Once the tractor is engaged, the
pressure should come back to normal.
If the pressure shows the sudden drop, it is more likely a hydraulic problem.
If the pressure does not show the sudden drop, it is more likely the sensor or its wiring problem.
NOTE: The engaging of the transmission may cause sudden movement of the tractor. Execute extreme caution
when engaging the tractor to avoid any personal damage. Do the test only when the tractor can be moved safely.
3. Troubleshooting of hydraulic problem.
A. Adjust the regulated system pressure.
If the pressure is too low or beyond adjustment, check the pressure regulating valve and other parts. Look
for external and internal leaks.
B. Make sure that it is safe for the tractor to move during testing. Shift through gears.
At each shift, the pressure should have a sudden drop to fill the clutch. Once the tractor is engaged, the
pressure should come back to normal.
If the sudden drop is dramatic and pressure recovery is very slow when a gear is engaged, it is very likely
that the clutch for that gear is leaking.
Such as:
If the clutch for 1-2 is leaking, the dramatic sudden drop and the slow pressure recovery should happen
when engaging the following gears: 1, 2, 7, 8, 13, and 14.
If the clutch for Odd is leaking, the dramatic sudden drop and the slow pressure recovery should happen
when engaging the following gears: 1, 3, 5, 7, 9, etc.
If the clutch for Mid is leaking, the dramatic sudden drop and the slow pressure recovery should happen
when engaging the Mid gears: 6 to 7 and 13 to12.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 147
55-4-75