SkyTrak 8042 Service Manual - Manual (Page 466)

8.51 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
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If there is no four-wheel or crab
steering, check the steer select valve.
Check the steer select switch and wiring.
If there is no steering, check the
steering system electrical components.
Front or rear wheels are not parallel
in front or four-wheel steering mode.
Check wheel alignment.
Check the steer select valve.
Check the pressure at the “PSG” port of the
secondary function manifold.
Check packing in steering cylinders.
Check the front and rear steering cylinders
for packing leaks.
Check pump flow.
Check the power steering unit.
Check the main system pressure on the
main control valve.
Check the pump compensator pressure.
Check the shuttle valve.
Check the load sense pressure at the “PLT”
port on the secondary function manifold.
Check that the check valve fitting at the
power steering unit is operating properly.
Inspect/replace the steer select valve.
Refer to the steering circuits and
components in Section 9.7, “Electrical
System Troubleshooting,” and Section
9.14, “Switches and Solenoids.”
If OK
If OK
Perform indexing procedure on vehicle.
Replace the steer select valve.
If OK
Refer to the steering circuits and
components in Section 9.7, “Electrical
System Troubleshooting,” and Section
9.14, “Switches and Solenoids.”
If OK
Repair/replace steering cylinder.
If OK
If OK
Repair/replace steering cylinder(s).
If OK
If OK
Replace power steering unit.
Adjust/replace the relief valve.
Consult factory to adjust the
compensator pressure at the pump.
Replace shuttle valve.
If OK
If OK
Repair/replace pump.
If OK
If OK
Adjust/repair/replace the pressure reducing
valve on secondary function manifold.
Replace check valve fitting.
If OK
Adjust/repair/replace the pressure reducing
valve on secondary function manifold.
Refer to Section 5.3.8, “ZF Axle Repair
Manuals,” for proper ZF Axle Repair
Manual for further information.