Method For Testing Ls-Epc Valve Outlet Pressure - Komatsu PC500LC-10R Shop Manual

TEST AND ADJUST OIL PRESSURE IN PUMP LS CONTROL CIRCUIT
4.
Install the nipple C to the part from where the oil pressure
pickup plugs (PFC), (PRC), (PLSFC), and (PLSRC) are re-
moved.
5.
Connect the gauge A1 and A2 of hydraulic tester A to the
pressure pickup port to be tested.
• When testing the front pump side: Connect the gauge
A1 to the nipple C of (PFC). Connect the gauge A2 to
the nipple C of (PENF).
• When testing the rear pump side: Connect the gauge
A1 to the nipple C of (PRC). Connect the gauge A2 to
the nipple C of (PENR).
REMARK
Gauge in the digital hydraulic tester B can also be
used instead 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.
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
10. Set the working mode to P ("Power Mode").
11. Turn the fuel control dial to MAX (High idle) position.
12. Check the pump discharge pressure and the LS valve out-
let pressure (servo piston inlet pressure) simultaneously
when all the control levers and pedals are in NEUTRAL
position, and when the travel lever is at half stroke.
See STANDARD VALUE TABLE, "STANDARD VALUE TA-
BLE FOR MACHINE" for standard values.
Remove the testing tools and restore the machine after the test is finished.

METHOD FOR TESTING LS-EPC VALVE OUTLET PRESSURE

1.
Release the remaining pressure by referring to "RELEASE REMAINING PRESSURE FROM HYDRAULIC
SYSTEM".
30-84
30 TESTING AND ADJUSTING
PC500LC-10R