Test Oil Pressure Of Control Circuit; Method For Testing Oil Pressure Of Control Circuit - Komatsu PC500LC-10R Shop Manual

TEST OIL PRESSURE OF CONTROL CIRCUIT

TEST OIL PRESSURE OF CONTROL CIRCUIT
Tools for testing and adjusting oil pressure of control circuit
Symbol Part No.
- 799-101-5002
A
1 799-101-5130
B 790-261-1205
C 799-101-5220
D 07002-11023
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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.
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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.
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Lower the work equipment to the ground, and stop the engine. Operate the control lever several
times to release the remaining pressure in the piping. Loosen the oil filler cap of the hydraulic tank
gradually to release the pressure in the tank.
Check this item under the following conditions.
Hydraulic oil temperature: 45 to 55 °C
Perform testing and adjusting of control circuit pressure for troubleshooting by referring to this section.

METHOD FOR TESTING OIL PRESSURE OF CONTROL CIRCUIT

1.
Release the remaining pressure by referring to "RELEASE REMAINING PRESSURE FROM HYDRAULIC
SYSTEM".
2.
Remove the control valve top cover, and remove the pick-
up plug (1).
3.
Install the nipple C and connect it to the gauge A1 of the
hydraulic tester A.
REMARK
Gauge in the digital hydraulic tester B can also be used in-
stead of the gauge A1.
4.
Start the engine.
5.
Select and display "Pre-defined Monitoring" (01/11) by re-
ferring to "SET AND OPERATE MACHINE MONITOR".
6.
Adjust the hydraulic oil temperature so that it is within the
specified range.
7.
Set the working mode to P ("Power Mode").
8.
Turn off the auto-deceleration.
9.
Turn the fuel control dial to MAX (High idle) position.
10. Check the oil pressure when all control levers and control pedals are in NEUTRAL position.
See STANDARD VALUE TABLE, "STANDARD VALUE TABLE FOR MACHINE" for standard values.
30-74
Part name
Hydraulic tester
Gauge
Digital hydraulic tester
Nipple
O-ring
30 TESTING AND ADJUSTING
Q'ty Remarks
1
1 Pressure range: 6 MPa
1 Pressure range: 70 MPa
1 Size: M10 x 1.25 mm
1
PC500LC-10R