Komatsu PC500LC-10R Shop Manual page 489

30 TESTING AND ADJUSTING
10. Raise the L.H. track shoe off the ground by operating the
work equipment control lever.
When measuring the front circuit: L.H. track
When measuring the rear circuit: R.H. track
11. Set the working mode to P ("Power Mode").
12. Set the travel speed to "Hi".
13. Turn the fuel control dial to MAX (High idle) position.
14. Check the pump discharge pressure and the LS pressure
(actuator load pressure) simultaneously when all the con-
trol levers and pedals are in NEUTRAL position, and the
travel lever is at half stroke.
REMARK
Obtain the LS differential pressure (when using the oil pressure gauge): LS differential pressure = Pump
discharge pressure - LS pressure
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 LS VALVE OUTLET PRESSURE (SERVO PISTON INLET
PRESSURE)
NOTICE
To measure the LS valve outlet pressure (servo piston inlet pressure), measure the pump discharge
pressure simultaneously and compare them.
REMARK
Front pump discharge pressure and rear pump discharge pressure can also be tested by using monitoring func-
tion of the machine monitor.
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), (PRC),
(PENF), and (PENR)
(PFC): Front pump discharge pressure pickup port
(PRC): Rear pump discharge pressure pickup port
(PENF): Front LS valve outlet pressure pickup port
(PENR): Rear LS valve outlet pressure pickup port
PC500LC-10R
TEST AND ADJUST OIL PRESSURE IN PUMP LS CONTROL CIRCUIT
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