Komatsu PC500LC-10R Shop Manual page 472

TEST AND ADJUST OIL PRESSURE IN WORK EQUIPMENT, SWING,
AND TRAVEL CIRCUITS
8.
Measure "Front Pump Pressure" and "Rear Pump Pressure" when the pressure in the work equipment cir-
cuit to be tested is being relieved with operation of the work equipment lever.
Relieved pressure of the main relief valve is displayed.
REMARK
If the one-touch power maximizing switch is not pressed, the low relief pressure is obtained. If the former is
pressed, the high relief pressure is obtained.
See STANDARD VALUE TABLE, "STANDARD VALUE TABLE FOR MACHINE" for standard values.
METHOD FOR TESTING WORK EQUIPMENT RELIEF PRESSURE BY TESTING
TOOLS
1.
Release the remaining pressure by referring to "RELEASE REMAINING PRESSURE FROM HYDRAULIC
SYSTEM".
2.
Open the cover on the left side of the machine.
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 OFF position.
11. Operate the cylinders to be checked to the stroke end.
REMARK
Turn the secondary work equipment actuation switch to
OFF position when oil pressure in boom circuit is relieved.
12. Turn the fuel control dial to MAX (High idle) position.
13. Measure the pump pressure when the pressure in the
work equipment circuit to be tested is relieved by operating
the work equipment lever.
Relieved pressure of the main relief valve is displayed.
REMARK
If the one-touch power maximizing switch is not pressed,
the low relief pressure is obtained. If the former is pressed,
the high relief pressure is obtained.
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 SWING RELIEF PRESSURE BY MACHINE MONITOR
1.
Start the engine.
30-66
30 TESTING AND ADJUSTING
PC500LC-10R