SkyTrak 8042 Service Manual - Manual (Page 462)

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