Komatsu PC500LC-10R, Руководство по ремонту, Страница: 482 / 758

TEST AND ADJUST OIL PRESSURE IN PUMP PC CONTROL CIRCUIT
Testing and adjusting tools for oil pressure in pump PC control circuit
Symbol Part No. Part name Q'ty Remarks
A
- 799-101-5002 Hydraulic tester 1
1 799-101-5110 Gauge 1 Pressure range : 60 MPa
2 799-101-5130 Gauge 1 Pressure range : 6 MPa
B - 790-261-1205 Digital hydraulic tester 1 Pressure range : 70 MPa
C 799-101-5220 Nipple 4 Size: M10 x 1.25 mm
D 07002-11023 O-ring 4
k
Place the machine on a level ground, and then lower the work equipment completely to the ground in
a stable posture. Set the lock lever to LOCK position, and then stop the engine.
k
Parts and oil are still very hot immediately after the engine is stopped. It may cause burn injury. Wait
for the temperature to go down, and then start the work.
k
Lower the work equipment to the ground, and stop the engine. Operate the control levers several
times to release the remaining pressure in the piping, and then loosen the oil filler cap of the hy-
draulic tank slowly to release the internal pressure.
Test this item under the following conditions.
Hydraulic oil temperature : 45 to 55 °C
Before testing this item, check that the oil pressure in the work equipment, swing, and travel circuits and control
circuit oil pressure is normal.
For testing of pump PC control circuit source pressure to perform troubleshooting or others, refer to this section.
TEST PC VALVE OUTLET PRESSURE (SERVO PISTON INLET PRESSURE)
NOTICE
To measure the PC valve outlet pressure (servo piston inlet pressure), measure the pump discharged
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 PC valve outlet pressure pickup port
(PENR): Rear PC valve outlet pressure pickup port
4.
Install the nipple C to the oil pressure pickup plugs (PFC),
(PRC), (PENF), and (PENR).
TEST AND ADJUST OIL PRESSURE IN PUMP PC CONTROL CIRCUIT 30 TESTING AND ADJUSTING
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