Testing Ppc Valve Output Pressure - Komatsu Galeo PC138US-8 Shop Manual

30 Testing and adjusting
Testing PPC valve output
pressure
Connecting points of PPC piping
a The above figure shows the connecting points
of the PPC piping on the control valve of 1
attachment installation specification. The col-
ors in ( ) are the colors of the bands installed
for distinction of the pipes.
a The figure at right shows the check points of
the steering signal voltage of the travel PPC
valve. When testing the steering signal volt-
age, remove the undercover of the operator's
cab (front side).
PC138US, USLC-8
a Testing tools for PPC valve output pressure
1
Symbol Part No.
799-101-5002 Hydraulic tester
1
P 790-261-1204 Digital hydraulic tester
2 799-401-3100 Adapter (Size: 02)
k
Stop the machine on a level ground and
lower the work equipment to the ground.
Then, release the residual pressure from
the hydraulic circuit. For details, see
"Releasing residual pressure from hydrau-
lic circuit".
a Before testing the PPC valve output pressure,
check that the basic pressure of the control cir-
cuit is normal.
a Test the solenoid valve output pressure under
the following condition.
Hydraulic oil temperature: Within operating
q
range
1. Disconnect the hose of the PPC circuit to be
tested.
a For the hose to be disconnected, see
"Connecting points of PPC piping".
2. Install adapter P2 and connect the discon-
nected hose again.
3. Install nipple [1] of hydraulic tester P1 and con-
nect it to oil pressure gauge [2].
a Use the oil pressure gauge of 5.9 MPa {60
2
kg/cm
a The figure shows the testing tools con-
nected to the hose of the bucket dump
PPC circuit.
SEN02458-01
Part name
}.
39