Komatsu PC500LC-10R, Shop Manual, Page: 496 / 758

TEST PPC VALVE OUTLET PRESSURE
Testing tools for PPC valve output pressure
Symbol Part No. Part name Q'ty Remarks
A
- 799-101-5002 Hydraulic tester 1
1 799-101-5130 Gauge 1 Pressure range: 6 MPa
2 799-101-5160 Nipple 1 Size: R1/8
B 790-261-1205 Digital hydraulic tester 1 Pressure range: 70 MPa
C 790-301-1730 Joint 1 Size: PF1/4 x Rc1/8
D 07000-12011 O-ring 1
k
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.
Test this item under the following conditions.
Hydraulic oil temperature : 45 to 55 °C
Before testing this item, check that the control circuit oil pressure is normal.
You can check the following PPC valve outlet pressure with the monitoring function of the machine monitor (For
details, see “SETTING AND OPERATION OF MACHINE MONITOR”).
Monitoring code: 07400“Boom Raise PPC Pressure”
Monitoring code: 07500“Boom Lower PPC Pressure”
Monitoring code: 07200“Arm IN PPC Pressure”
Monitoring code: 07600“Arm OUT PPC Pressure”
Monitoring code: 07300“Bucket CURL PPC Pressure”
Monitoring code: 07301“Bucket DUMP PPC Pressure”
Monitoring code: 09001“Swing Left PPC Pressure”
Monitoring code: 09002“Swing Right PPC Pressure”
Monitoring code: 07102“Travel Forward Left PPC Press”
Monitoring code: 07103“Travel Forward Right PPC Press”
Monitoring code: 07104“Travel Reverse Left PPC Press”
Monitoring code: 07105“Travel Reverse Right PPC Press”
For testing and adjusting of PPC valve output pressure to perform troubleshooting or Pm Clinic, etc. refer to this
section.
METHOD FOR TESTING PPC VALVE OUTLET PRESSURE
1.
Release the remaining pressure by referring to “RELEASE REMAINING PRESSURE FROM HYDRAULIC
SYSTEM”.
2.
Check that the system operating lamp is not lit, and turn the battery disconnect switch to OFF position.
3.
Remove the undercover (1).
TEST PPC VALVE OUTLET PRESSURE 30 TESTING AND ADJUSTING
30-90 PC500LC-10R