Komatsu Galeo PC800-8 Shop Manual page 375

30 Testing and adjusting
2. Measuring outlet pressure of swing PPC
shuttle valve
1) Disconnect outlet hose (9) of the swing PPC
shuttle valve. Install adapter Q2 and con-
nect the hose again.
a When measuring the swing PPC shuttle
valve, remove the control valve top cover.
2) Install the nipple [2] (R1/8) of hydraulic
tester Q1 and connect it to oil pressure
gauge [1].
a Use a pressure gauge of 6.0 MPa {60
kg/cm }
2
3) Run the engine at high idle, set the condition
or operate the control levers as shown in the
table, and measure the output pressure.
a If the swing PPC shuttle valve outlet
pressure is as shown in the table, the
PPC shuttle valve is normal.
Measurement condition
Neutral
Left work
Position for
equipment
swinging to left
control
lever
Position for
swinging to right
PC800, 850-8
3. Measuring outlet pressure of swing priority
Outlet pressure
(MPa {kg/cm })
2
0 {0}
Min. 2.35
{Min. 24}
Min. 2.35
{Min. 24}
4) After finishing measurement, remove the
measuring instruments and return the
removed parts.
selector valve
1) Disconnect outlet hoses (10) and (11) of the
swing priority selector valve. Install adapters
Q2 and connect the hoses again.
a When measuring the swing priority se-
lector valve, remove the control valve
top cover.
• (10): Port A1 (For swing)
• (11): Port A2 (For arm Lo and bucket Hi)
2) Install the nipple (R1/8) of hydraulic tester
Q1 and connect it to oil pressure gauge [1].
a Use a pressure gauge of 60 MPa {600
kg/cm }
2
k Since the outlet pressure of the swing
priority selector valve is the same as the
main pump pressure, take care not to
connect the oil pressure gauge for low
pressure.
SEN00912-02
9