Testing solenoid valve output
pressure 1
a Testing tools for solenoid valve output pressure
a Before testing the solenoid valve output pres-
sure, check that the control circuit basic pres-
sure is normal.
k Lower the work equipment to the ground
and stop the engine. Operate the control
lever several times to release the residual
pressure from the piping, and then loosen
the oil filler cap of the hydraulic tank slowly
to release the residual pressure from the
tank.
1. Disconnect hoses (1)  (6) of the solenoid
valves to be tested.
a Since hose (1) is installed under the cab,
remove the cab undercover (rear one).
a Since hoses (2)  (6) are installed under
the control valve, remove the control valve
undercover.
2. Install adapter N2 and connect the discon-
nected hoses again.
3. Install nipple N3 and connect it to pressure
gauge [1] of hydraulic tester N1.
a Use the oil pressure gauge of 5.9 MPa {60
kg/cm
2
}.
a The testing tools installed to the outlet
hose of the PPC lock solenoid valve are
shown in the figure.
4. Run the engine and heighten the hydraulic oil
temperature to the operating range.
Symbol Part No. Part name
N
1
799-101-5002 Hydraulic tester
790-261-1204 Digital hydraulic tester
2
799-401-3100 Adapter (Size: 02)
799-401-3200 Adapter (Size: 03)
3
799-101-5220 Nipple (10 x 1.25 mm)
07002-11023 O-ring
No. Solenoid valve to be tested
1 PPC lock solenoid valve
2 Pump merge-divider solenoid valve
3 Travel junction solenoid valve
4 Travel speed selector solenoid valve
5 Swing holding brake solenoid valve
6 2-stage relief solenoid valve
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