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

SEN02458-01
Testing solenoid valve output
pressure
a Testing tools for solenoid valve output pressure
Symbol Part No.
799-101-5002 Hydraulic tester
1
N 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 solenoid valve output pres-
sure, check that the basic pressure of the con-
trol circuit is normal.
a Test the solenoid valve output pressure under
the following condition.
Hydraulic oil temperature: Within operating
q
range
1. Remove the control valve left side cover and
disconnect outlet hoses (1) – (5) of the sole-
noid valve to be checked.
No. Solenoid valve to be tested
1 PPC lock solenoid valve
2 Travel speed shifting solenoid valve
3 Swing holding brake solenoid valve
4 Merge-divider valve
5 Travel junction solenoid valve
a When testing with hose (1), remove the
undercover (rear side) of the operator's
cab.
38
1
Part name
2. Install adapter N2 and connect the discon-
nected hose again.
3. Install nipple [1] of hydraulic tester N1 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 outlet hose (1) of the PPC lock
solenoid valve.
4. Start the engine.
5. Run the engine at high idle, operate the control
levers and switches to turn the solenoid valve
ON or OFF, and test the oil pressure.
a For the conditions for turning the solenoid
valve ON and OFF, see the operation
table of each solenoid valve.
a The operating condition of the solenoid
valve can be checked with the monitoring
function of the machine monitor (For
details, see "Special functions of machine
monitor").
Monitoring code: 02300 Solenoid 1
q
a If the output pressure is as follows, the
solenoid valve is normal.
Solenoid valve
OFF
(Demagnetization)
ON (Excitation)
6. After finishing test, remove the testing tools
and return the removed parts.
30 Testing and adjusting
Output pressure
2
0 MPa {0 kg/cm
2.9 MPa {30 kg/cm
PC138US, USLC-8
}
2
}