Skytrak 6042 Service Manual User Manual download pdf (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

Refer to Section 9.15.3,

“Hydraulic Oil Temperature

Switch.”

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

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