Testing Ppc Valve Output Pressure - Komatsu PC130-8 Shop Manual

SEN04114-06
Testing PPC valve output
pressure
a Testing tools for PPC valve output pressure
Symbol Part No.
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
P 2 799-401-3100 Adapter (Size: 02)
799-101-5220 Nipple (10 x 1.25 mm)
3
07002-11023
a Test PPC valve output pressure after confirm-
ing that control circuit original pressure is nor-
mal.
1. Remove PPC oil pressure switches (1) through
(8) in the hydraulic circuits to be tested. Con-
nector numbers are shown in brackets ( ).
No. Circuit to be tested
1 Boom, RAISE (P06)
2 Boom, LOWER (P02)
3 Arm, IN (P04)
4 Arm, OUT (P08)
a (1) – (8) are installed to the PPC junction
block in the rear of the cab.
44
Part name
O-ring
No. Circuit to be tested
5 Bucket, CURL (P01)
6 Bucket, DUMP (P05)
7 Swing, left (P07)
8 Swing, right (P03)
a Install nipple P3 to adapter P2 and mea-
sure the travel PPC pressure at the valve
1
box elbow.
2. Fit fitting [2] of hydraulic tester P1 and connect
oil pressure gauge [1].
a Use an oil pressure gauge with the capacity
of 5.9 MPa {60 kg/cm
a The testing tools installed to the mounting
part of the boom RAISE PPC oil pressure
switch are shown in the figure.
3. Start the engine and keep it running until the
hydraulic oil temperature rises to the operating
range.
a Turn OFF the auto-decelerator switch.
30 Testing and adjusting
2
}.
PC130-8