Komatsu PC500LC-10R Shop Manual page 474

TEST AND ADJUST OIL PRESSURE IN WORK EQUIPMENT, SWING,
AND TRAVEL CIRCUITS
3.
Remove the oil pressure pickup plugs (PFC) and (PRC).
(PFC): Front pump discharge pressure pickup port
(PRC): Rear pump discharge pressure pickup port
4.
Install the nipple C in the hydraulic tester A to the position
where the oil pressure pickup plugs (PFC) and (PRC) were
removed.
5.
Connect the gauge A1 of hydraulic tester A to the nipple C.
REMARK
Gauge in the digital hydraulic tester B can also be used in-
stead of the gauge A1.
6.
Start the engine.
7.
Select and display "Pre-defined Monitoring" (01/11) by re-
ferring to "SET AND OPERATE MACHINE MONITOR".
8.
Adjust the hydraulic oil temperature so that it is within the
specified range.
9.
Set the working mode to P ("Power Mode").
10. Turn the swing lock switch to ON position.
REMARK
If the swing lock switch is turned on, the main relief valve
is set for high-pressure relief.
11. Turn the fuel control dial to MAX (High idle) position.
12. Measure the Pump Pressure by operating the swing con-
trol lever to the right or left and relieve the swing circuit.
The pressure of the swing motor safety valve is displayed
on the monitor.
REMARK
The set pressure of the swing motor safety valve is lower
than that of the main relief valve. If the swing circuit is re-
lieved, the safety valve is relieved as well.
See STANDARD VALUE TABLE, "STANDARD VALUE TABLE FOR MACHINE" for standard values.
Remove the testing tools and restore the machine after the test is finished.
METHOD FOR TESTING TRAVEL RELIEF PRESSURE BY MACHINE MONITOR
1.
Start the engine.
2.
Insert the pin E and the plate F between the sprocket and
the track frame to securely lock the track.
30-68
30 TESTING AND ADJUSTING
PC500LC-10R