New Holland T8010 Manual page 1561

transmission clutches are slipping
Cause:
If the transmission controller detected the output speed is too low for gear selected, this fault code will be recorded.
Possible failure mode:
1. Failed transmission speed sensor.
2. Solenoid mechanically not being turned ON (sticking).
3. Low hydraulic system pressure.
4. Leaking transmission clutch.
5. Failed master clutch.
6. Failed shaft in transmission.
Solution:
The transmission controller compares the engine speed against the final drive speed. This ratio will change as
different gears are selected. If this fault code only appears in certain gears a clutch may be starting to fail.
1. Check for fault code 77, 79, and 80.
Make sure there not fault indication for the engine speed and the transmission output (final drive) speed
2. Check for fault code 147.
Make sure the regulated system pressure is within the specified range.
3. Check for fault code 50 and 52.
Make sure the park brake is released.
4. If none of above fault code are recorded, check and verify that the transmission clutches are slipping.
A. Clear the fault code. Engage different gears until the fault code shows up.
B. Check whether the tractor speed is normal in the gears which create the fault code. Pay attention to
abnormal noise and sluggish gear engagement.
If It is suspected that the transmission slips in certain gears, go to step 5.
If there is no sign of clutch slippage, either engine speed signal or transmission speed signal may be
invalid. Go to step 6 and 7.
5. Troubleshoot the clutch slippage.
A. Select different gears to identify the slipping clutch. Refer to the powershift valve clutch engagement table
for clutches engaged in each gear. See section 6000 in this manual.
B. If a slipping clutch is identified, test its solenoid and the valve.
Make sure the solenoid will mechanically engage when it is turned ON.
Make sure there is no sticking spool in the valve.
C. If none of above, check for transmission internal failure such as failed clutch or broken shaft.
6. Test the transmission speed sensing (refer to the troubleshooting procedure for fault 80)
Test the resistance of the transmission speed sensor:
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 81
55-4-34