Hydraulic system – SkyTrak 6042 Service Manual User Manual
Page 265
8.33
Model 6042 Legacy
Origin 7/02
Hydraulic System
NOTE:
When checking pressures in
circuits, refer to Section 8.7,
“Hydraulic System Testing” for
correct pressure readings.
Not
OK
Not
OK
Not
OK
If the pump is not
functioning properly,
check the suction line from
the reservoir.
Repair/replace suction line.
If the cooler is not cooling
the oil, check that the
radiator and cooler are not
clogged or obstructed.
If OK
Not
OK
Check the main system
pressure at the “VG” port of
unloader valve.
If the unloader valve is not
functioning properly,
check the pressure and
flow to the valve.
Adjust/repair/replace the
relief valve on the
unloader valve.
If OK
Clean radiator and cooler.
Not
OK
Check pump flow.
Repair/replace pump.
If OK
If OK
Not
OK
Repair/replace suction line.
Check the suction line from
the reservoir.
Check the differential
pressure sense valve on the
unloader valve.
Repair/replace the differential
pressure sense valve on the
unloader valve.
If OK
Not
OK
Inspect the check valve on
the unloader valve.
Replace the check valve on
the unloader valve.
If OK
Before troubleshooting any
hydraulic circuit, ALWAYS
begin by checking the
following:
1. Hydraulic oil level in the
reservoir
2. All hoses, tubes, fittings
for leaks, kinks,
interference, etc.
3. Air in the lines
Not
OK
Repair/replace pump.
Check the oil flow
to the pump.
If OK