Komatsu Galeo PC800-8 Shop Manual page 362

SEN00788-02
7) While the track is running with no load,
measure the VC valve basic pressure and
output pressure under the following condi-
tion.
i) Using the boom and arm, push up the
track shoe on the side to be measured.
ii) While the engine is running at high idle,
operate the travel lever to the stroke
end and measure the basic pressure
and output pressure.
• Left travel : Front pump side
• Right travel : Rear pump side
8) After finishing measurement, remove the
measuring instruments and return the
removed parts.
Judgment table
Operation mode
EPC valve output pressure
(Pce1 (Pce2))
(VC valve control pressure)
2
MPa {kg/cm }
Servo piston position
Judgment value of VC valve
output pressure (Pce1 (Pce2))
(Servo piston large-diameter
pressure)
*1. Since the swash plate is at the intermediate point, the pressure is about "0.5 – 0.6 times" (approx. 1/2 of) the relief pressure (discharge
pressure).
14
All levers in neutral
Max. 0.78
{Max. 8}
Contact with stopper on min.
swash plate angle side
Approx. 1/2 of basic pressure C
1/2 Pch1 (Pch2) to
Pch1 (Pch2)
Boom circuit relieved in raising
operation (With heavy lift OFF)
1.03 – 1.43
{10.5 – 14.5}
Intermediate between min. and
max. swash plate angles
Approx. 1/2 of basic pressure
(C 1/2 x Pch1 (Pch2)) *1
30 Testing and adjusting
Track running with no load
(Lever at stroke end)
Min. 1.23
{Min. 12.5}
Contact with stopper on max.
swash plate angle side
Approx. 1/2 of basic pressure
to drain pressure C
1/2 Pch1 (Pch2) to Pd
PC800, 850-8