Testing Solenoid Valve Output Pressure - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02625-06
Testing solenoid valve output
pressure
a Solenoid valve output pressure measurement
tools
Symbol Part No.
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
799-401-3100 Nipple (02 size)
N 2
02896-11008
799-401-3200 Nipple (03 size)
3
02896-11009
a Measure the solenoid valve output pressure af-
ter confirming that the control circuit source pres-
sure is normal.
k
Lower the work equipment to the ground
and, after stopping the engine, release resid-
ual pressure in the piping by operating the
control lever several times. Then loosen the
oil filler cap gradually to release pressure in-
side the tank.
1. Disconnect the hoses of solenoid valve to be
measured at the outlet side.
No Target solenoid valves of measurement
1 PPC lock solenoid valve
2 Travel junction solenoid valve
3 Merge-divider solenoid valve
4 Travel speed switching solenoid valve
5 Swing holding brake solenoid valve
6 Machine push up solenoid valve
7 2-stage relief solenoid valve
a Hose (1) is installed in the back side of oper-
ator's cab, and hoses (2) through (7) are in-
stalled at the center of revolving frame.
48
Part name
O-ring
O-ring
2. Fit adapter N2 or N3 and then connect hose
currently disconnected.
3. Fit nipple [1] of hydraulic tester N1 and then
connect it to oil pressure gauge [2].
a Use the oil pressure gauge with capacity 6.0
2
MPa {60 kg/cm
4. Start the engine and keep it running until the
hydraulic oil temperature rises to the operating
range.
30 Testing and adjusting
}.
PC300, 350-8