Troubleshooting - New Holland T8010 Manual

Problem – Differential lock will not engage
1. Check for PTO System fault codes.
A. If fault codes are found, follow procedures outlined in PTO system fault code troubleshooting in this
section.
2. Push either brake pedal switch to deactivate the differential lock. Check the tractor monitor for the differential
lock icon in the instrumentation display.
A. If the differential lock icon is not displayed, this is an indication the electrical control circuit is functioning
correctly. Go to step 4.
B. If the differential lock icon is displayed, this in an indication the electrical control circuit is not functioning
correctly. Check fault codes, controller, and data bus function.
3. Activate the differential lock with the manual switch position. Check for 12 VDC at differential lock valve coil.
A. If 12 VDC is available to the coil, the differential lock electrical circuit is functioning properly.
B. If 12 VDC is not found, troubleshoot the differential lock electrical circuit.
1. Check wires 530A (R) and 175E (BK) ground.
2. Check all connections for excessive resistance.
Apply the brakes, this will deactivate the differential lock. Check for 12 VDC at differential lock valve coil.
C. If 12 VDC is available to the coil, the differential lock electrical circuit is not functioning properly.
1. Check left and right brake switches.
D. If 12 VDC is not found the differential lock electrical circuit is functioning properly.
4. Start and run the engine.
A. Press the INCR or DECR key on the programmable instrumentation until the TRANS OIL TEMP screen is
reached.
NOTE: Screen order is set by the operator. The TRANS OIL TEMP and TRANS SYS PRESSURE screens could
or could not be together depending on setup.
B. Operate the engine at 1500 RPM until the transmission temperature displayed on the instrumentation
reads at least 49
C. Press the INCR key as required to display the TRANS SYS PRESSURE screen.
5. While viewing the display, activate the Differential Lock. The display pressure should dip, then recover to
normal regulated pressure. If the pressure dips, but does not recover there is a leak in the Differential Lock
circuit. Repeat this check several times.
6.
A. Inspect the differential lock valve cartridge for leaking seals.
B. Inspect the differential lock slip ring teflon seals.
C. Inspect the differential lock piston o-ring.
7. Check and repair the differential lock clutch as needed.
Section 25 - Four-Wheel Drive Front Axle - Chapter 2

TROUBLESHOOTING

° °
C (120 F).
25-2-12